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FAA Private Pilot - Glider (PGL) study materials
FAA Private Pilot - Glider (PGL) study resources

FAA Private Pilot - Glider (PGL) practice questions

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Question 1Regulations and Aeronautical Knowledge

Under FAA regulations, what minimum age must a person reach before they may be issued a private pilot certificate with a glider category rating?

  1. 14 years
  2. 17 years Correct answer.
  3. 18 years
  4. 16 years

Explanation

The regulations require an applicant for a private pilot certificate, including a glider category rating, to be at least 17 years of age. Fourteen applies to student pilot certificates for glider operations, and 16 applies to sport pilot privileges.

Question 2Regulations and Aeronautical Knowledge

A private pilot with a glider rating wants to act as pilot in command of a glider carrying a passenger. Which recent flight experience requirement must be met?

  1. One takeoff and landing within the preceding 24 months
  2. Three takeoffs and three landings within the preceding 90 days
  3. A flight review within the preceding 12 months only
  4. Three takeoffs and three landings within the preceding 90 days in a glider Correct answer.

Explanation

To carry passengers, a pilot must have made three takeoffs and three landings within the preceding 90 days, and the experience must be in the category, class, and type of aircraft flown. For a glider, that means the takeoffs and landings must be accomplished in a glider.

Question 3Regulations and Aeronautical Knowledge

What is the duration of a third-class medical certificate for a pilot who is 40 years of age or older and is exercising private pilot privileges?

  1. 60 calendar months
  2. 36 calendar months
  3. 12 calendar months
  4. 24 calendar months Correct answer.

Explanation

For private pilot privileges, a third-class medical certificate is valid for 24 calendar months if the pilot has reached age 40, and for 60 calendar months if the pilot is under 40. Glider pilots operating under the self-certification allowance are not required to hold a medical certificate at all.

Question 4Regulations and Aeronautical Knowledge

Which statement correctly describes the medical certificate requirement for a private pilot operating a glider?

  1. A current driver's license may be used if the pilot self-certifies fitness Correct answer.
  2. A third-class medical certificate is always required
  3. No self-certification of any kind is permitted
  4. A second-class medical certificate is required

Explanation

A pilot exercising private pilot privileges in a glider may operate without a medical certificate if the pilot holds a current and valid U.S. driver's license and complies with the self-certification requirements regarding fitness to fly. The pilot must still determine that no medical condition would impair safe flight.

Question 5Regulations and Aeronautical Knowledge

A glider pilot holds a private pilot certificate with a glider rating and wants to add an airplane single-engine land rating. What must the pilot generally accomplish?

  1. The required training and a practical test for the added category and class Correct answer.
  2. A written exam administered by the glider club
  3. A flight review with any instructor, with no practical test
  4. Only a knowledge test, since the pilot already holds a private certificate

Explanation

Adding a category and class rating to an existing private pilot certificate requires the training specified for that rating and successful completion of the required practical test. Knowledge testing may be reduced or waived in some cases, but the practical test is not.

Question 6Regulations and Aeronautical Knowledge

What is the definition of a glider for the purpose of FAA certification and operating rules?

  1. A heavier-than-air aircraft supported in flight by dynamic reaction against the air
  2. A heavier-than-air aircraft supported in flight by the dynamic reaction of the air against its lifting surfaces, with free flight not dependent on an engine Correct answer.
  3. An aircraft that uses an engine only for takeoff
  4. A lighter-than-air aircraft supported by gas buoyancy

Explanation

A glider is a heavier-than-air aircraft whose free flight does not depend principally on an engine, supported by the dynamic reaction of the air against its lifting surfaces. A powered sailplane that can sustain level flight under power is certificated differently.

Question 7Regulations and Aeronautical Knowledge

A pilot is planning a flight in a glider and wants to know whether the flight can be conducted under visual flight rules in Class G airspace at 1,000 feet above ground level during the day. What minimum flight visibility applies?

  1. 5 statute miles
  2. 3 statute miles
  3. 1 statute mile Correct answer.
  4. No visibility requirement applies in Class G

Explanation

In Class G airspace at or below 1,200 feet above ground level during the day, the basic VFR minimum is 1 statute mile of flight visibility and clear of clouds. Glider operations frequently occur in this airspace, so this minimum is highly relevant.

Question 8Regulations and Aeronautical Knowledge

What cloud clearance is required for VFR flight in Class G airspace at 1,000 feet above ground level during the day?

  1. Clear of clouds Correct answer.
  2. 500 feet below and 1,000 feet above only
  3. 500 feet below, 1,000 feet above, and 2,000 feet horizontal
  4. 1,000 feet below, 1,000 feet above, and 1 mile horizontal

Explanation

In Class G airspace at or below 1,200 feet above ground level during the day, a VFR flight needs only to remain clear of clouds, along with the 1 statute mile visibility minimum. This is the least restrictive VFR weather minimum in the regulations.

Question 9Regulations and Aeronautical Knowledge

Which documents must a pilot in command of a glider have available for inspection during flight?

  1. Only the aircraft registration and airworthiness certificate
  2. The aircraft maintenance records and weight and balance data
  3. Only the aircraft logbooks
  4. A pilot certificate, a photo identification, and any required medical or self-certification documentation Correct answer.

Explanation

The pilot in command must carry or have available a pilot certificate and photo identification, plus any required medical certificate or evidence of compliance with the driver's license self-certification provision for gliders. Aircraft documents must also be aboard, but the question concerns pilot documents.

Question 10Regulations and Aeronautical Knowledge

What is the required action when a pilot in command deviates from a regulation in an in-flight emergency involving a glider?

  1. No report is ever required for any deviation
  2. The pilot must report the deviation to the local sheriff
  3. The pilot must, upon request from the FAA, submit a written report describing the deviation Correct answer.
  4. The pilot must land immediately at the nearest airport

Explanation

A pilot may deviate from a rule to the extent necessary to meet an emergency, but must, upon request from the Administrator, submit a written report describing the deviation. The report protects the pilot from enforcement action when the emergency justified the deviation.

Question 11Regulations and Aeronautical Knowledge

A glider is being towed by a powered airplane. Which statement about the tow pilot's responsibility is correct?

  1. The glider pilot is solely responsible for the safety of the tow
  2. Both pilots share responsibility for the safety of the tow Correct answer.
  3. The ground crew is responsible for the safety of the tow
  4. The tow pilot is solely responsible for the safety of the tow

Explanation

The pilot of the towing aircraft and the pilot of the glider share responsibility for the safety of the tow operation. Each must maintain vigilance, and either pilot may signal or initiate a release if the tow becomes unsafe.

Question 12Regulations and Aeronautical Knowledge

Which of the following best describes the right-of-way rule that applies when a glider and a powered airplane are approaching head-on?

  1. Both pilots alter course to the right Correct answer.
  2. The glider has the right of way
  3. The aircraft at the lower altitude has the right of way
  4. The powered airplane has the right of way because it is faster

Explanation

When two aircraft are approaching head-on or nearly so, each pilot must alter course to the right. This rule applies regardless of the category of aircraft, so a glider and a powered airplane both turn right to pass.

Question 13Regulations and Aeronautical Knowledge

A glider is overtaking another glider from behind. Which aircraft has the right of way?

  1. Neither, because gliders must always yield to each other
  2. The glider at the higher altitude
  3. The overtaking glider
  4. The glider being overtaken Correct answer.

Explanation

An aircraft that is overtaking another has the right of way only after it has passed; the aircraft being overtaken has the right of way. The overtaking pilot must alter course to the right to pass well clear.

Question 14Regulations and Aeronautical Knowledge

Under what condition may a private pilot operate a glider for compensation or hire?

  1. Never, under any circumstances
  2. When the flight is incidental to a business or employment and does not carry persons or property for compensation Correct answer.
  3. Whenever the passengers consent in writing
  4. Whenever the pilot holds a commercial certificate

Explanation

A private pilot may not carry persons or property for compensation or hire, but may log or conduct flights that are incidental to a business or employment, such as a business flight where the pilot is not being paid to fly. Holding out to the public for compensation is prohibited.

Question 15Regulations and Aeronautical Knowledge

What is the purpose of a flight review, and how often must it be accomplished?

  1. Every 12 calendar months, to review the general operating and flight rules
  2. Only after an enforcement action
  3. Every 24 calendar months, to review the general operating and flight rules Correct answer.
  4. Every 6 calendar months, to review only emergency procedures

Explanation

A flight review consists of a review of the current general operating and flight rules and at least 1 hour of flight training, and it must be completed within the preceding 24 calendar months to act as pilot in command. The review may be conducted in a glider by an authorized instructor.

Question 16Regulations and Aeronautical Knowledge

A pilot's most recent flight review was completed 25 calendar months ago. What is the pilot's status regarding acting as pilot in command?

  1. The pilot may act as pilot in command because the review is still valid for 36 months
  2. The pilot may act as pilot in command if a current medical certificate is held
  3. The pilot may act as pilot in command only if carrying no passengers
  4. The pilot may not act as pilot in command until a flight review is completed Correct answer.

Explanation

A flight review is valid for 24 calendar months, so a review completed 25 months ago has expired. Without a current flight review, the pilot may not act as pilot in command, although a pilot may still receive training from an instructor.

Question 17Regulations and Aeronautical Knowledge

What is the minimum altitude rule for a glider operating over a congested area of a city, town, or settlement?

  1. An altitude that allows a forced landing without undue hazard to persons or property Correct answer.
  2. 1,000 feet above the highest obstacle within a horizontal radius of 2,000 feet
  3. No minimum altitude applies to gliders
  4. 500 feet above the highest obstacle within a horizontal radius of 2,000 feet

Explanation

Over congested areas, aircraft must maintain an altitude of at least 1,000 feet above the highest obstacle within a 2,000-foot horizontal radius, but gliders are excepted and need only remain at an altitude allowing an emergency landing without undue hazard. The same exception applies to helicopters and to aircraft landing or taking off.

Question 18Regulations and Aeronautical Knowledge

What is the minimum altitude for a glider operating over an area other than a congested area?

  1. 200 feet above the surface
  2. 500 feet above the surface, except over open water or sparsely populated areas Correct answer.
  3. No minimum applies outside congested areas
  4. 1,000 feet above the surface at all times

Explanation

Over other than congested areas, aircraft must remain at least 500 feet above the surface, except over open water or sparsely populated areas where they must not operate closer than 500 feet to any person, vessel, vehicle, or structure. Gliders are expected to maintain an altitude permitting a safe emergency landing.

Question 19Regulations and Aeronautical Knowledge

Which certificate or rating is required to act as pilot in command of a glider?

  1. A private pilot certificate with a glider category rating, or a higher certificate with glider privileges Correct answer.
  2. A student pilot certificate only
  3. A sport pilot certificate with an airplane rating
  4. A commercial pilot certificate with an airplane rating

Explanation

Acting as pilot in command of a glider requires at least a private pilot certificate with a glider category rating, or a higher-grade certificate that includes glider privileges. A student pilot may solo a glider only under the endorsements and limitations applicable to student pilots.

Question 20Regulations and Aeronautical Knowledge

A self-launching glider is equipped with a retractable engine. What must the pilot consider regarding the aircraft's certification before operating it under glider privileges?

  1. Any glider with an engine must be operated under airplane privileges
  2. The engine may be used for sustained cruise flight without additional ratings
  3. The aircraft is treated as an airplane whenever the engine is running
  4. The aircraft must be certificated in the glider category and the pilot must hold glider privileges appropriate to the operation Correct answer.

Explanation

A self-launching sailplane certificated in the glider category may be operated by a pilot holding glider privileges, provided the pilot complies with any limitations in the aircraft's operating limitations. Using the engine for sustained flight may require additional authorization depending on how the aircraft is certificated.

Question 21Regulations and Aeronautical Knowledge

What action should a pilot take when a glider is being overtaken by another aircraft while both are in a thermal?

  1. The glider in the thermal has no obligation to maneuver
  2. The lower glider must yield to the higher glider
  3. The overtaking aircraft must give way and pass well clear Correct answer.
  4. Both aircraft must immediately land

Explanation

The aircraft being overtaken has the right of way, and the overtaking aircraft must alter course to the right and pass well clear. Sharing thermals requires vigilance because gliders may be circling in close proximity with limited visibility.

Question 22Regulations and Aeronautical Knowledge

A pilot holds a private pilot certificate with a glider rating and has not acted as pilot in command in the preceding 24 months. What must the pilot do before acting as pilot in command again?

  1. Complete a biennial flight review only if carrying passengers
  2. Complete a flight review with an authorized instructor Correct answer.
  3. Obtain a new medical certificate
  4. Pass a new knowledge test

Explanation

A pilot who has not acted as pilot in command within the preceding 24 months must complete a flight review with an authorized instructor before acting as pilot in command. The review includes a rules review and at least 1 hour of flight training.

Question 23Regulations and Aeronautical Knowledge

Which statement correctly describes the use of safety belts in a glider during flight?

  1. Each occupant must have a safety belt and shoulder harness properly secured during takeoff and landing Correct answer.
  2. Safety belts are optional in gliders because of the seating configuration
  3. Only the pilot must wear a safety belt
  4. Safety belts are required only during takeoff and landing

Explanation

Each person on board must have a safety belt and shoulder harness properly secured during takeoff and landing, and the pilot must ensure that passengers are briefed on their use. Glider occupants are typically restrained throughout the flight, including during thermalling and aerotow.

Question 24Regulations and Aeronautical Knowledge

What is the significance of the aircraft's operating limitations for a glider?

  1. They are replaced by the pilot's operating handbook
  2. They are part of the airworthiness certificate and must be complied with during operation Correct answer.
  3. They are advisory only and may be disregarded by the pilot
  4. They apply only to commercial operations

Explanation

The operating limitations are part of the aircraft's airworthiness certificate and define the conditions under which the aircraft may be operated. Exceeding them, such as by exceeding the never-exceed speed or maximum gross weight, renders the flight noncompliant and unsafe.

Question 25Regulations and Aeronautical Knowledge

A glider pilot intends to conduct a flight in Class C airspace. What is required before entering the airspace?

  1. Two-way radio communication must be established with ATC and the aircraft must have an operable transponder with altitude reporting, unless an exception applies Correct answer.
  2. No communication is required if the glider remains clear of clouds
  3. Only a Mode C transponder is required, with no radio communication
  4. A clearance is required only for instrument flight rules flights

Explanation

Operations in Class C airspace require establishing two-way radio communication with ATC before entry and maintaining an operable transponder with automatic altitude reporting, subject to certain exceptions. Gliders may qualify for limited exceptions, but the general rule requires compliance.

Question 26Regulations and Aeronautical Knowledge

A private pilot who holds only a glider rating wants to add a single-engine airplane category and class rating. What must the pilot accomplish?

  1. Pass the required airplane knowledge test and practical test, and receive the appropriate training and endorsements for the airplane rating Correct answer.
  2. Complete only a flight review in an airplane with an authorized instructor and log the flight as the required check
  3. Submit a written request to the FAA and receive the added rating automatically after 50 hours of airplane flight time
  4. Pass the airplane practical test only, because the glider knowledge test satisfies the aeronautical knowledge requirement for all categories

Explanation

Adding an airplane category and class rating to a private pilot certificate requires the pilot to meet the knowledge and practical test standards for that rating, along with the training and endorsements required by the regulations. Holding a glider rating does not substitute for the airplane aeronautical knowledge test.

Question 27Regulations and Aeronautical Knowledge

A glider pilot is preparing to fly and wants to know the regulatory status of the glider's airworthiness certificate. Which statement is correct?

  1. The glider must have an airworthiness certificate issued under the applicable rules, and it remains valid as long as the aircraft is maintained in airworthy condition Correct answer.
  2. The glider must have a current standard airworthiness certificate that expires annually
  3. The glider needs only a special flight permit for each flight conducted
  4. The glider is exempt from airworthiness certification because gliders are not powered aircraft

Explanation

Gliders operated in the United States must hold an airworthiness certificate appropriate to the aircraft, and that certificate stays in effect as long as the aircraft meets its type design and is maintained in an airworthy condition. It does not expire on a calendar basis.

Question 28Regulations and Aeronautical Knowledge

A glider pilot has logged no flight time for eight months and now plans to carry a passenger. No other recent-experience requirement applies to the pilot. What recent flight experience must the pilot have to act as pilot in command carrying a passenger?

  1. A flight review within the preceding 6 calendar months
  2. Three takeoffs and three landings within the preceding 90 days, all in the same category and class
  3. A biennial flight review and an instrument proficiency check
  4. Three takeoffs and three landings within the preceding 90 days in a glider Correct answer.

Explanation

To carry passengers, a pilot must have made three takeoffs and three landings within the preceding 90 days in an aircraft of the same category, class, and type if a type rating is required. For a glider, that means three takeoffs and landings in a glider.

Question 29Regulations and Aeronautical Knowledge

A pilot is planning a flight in a glider and wants to know the medical certificate requirement. Which statement is correct for a private pilot operating a glider?

  1. A medical certificate is required only when the glider is towed by a commercial operator
  2. No medical certificate is required to operate a glider, although the pilot must self-certify fitness for flight Correct answer.
  3. A current second-class medical certificate is required only when carrying passengers
  4. A current third-class medical certificate is required before any glider flight

Explanation

Glider operations do not require a medical certificate, but the pilot must determine that they are physically and mentally fit for the flight and must not act as pilot in command while impaired. Self-certification replaces the medical certificate requirement for gliders.

Question 30Regulations and Aeronautical Knowledge

A glider pilot is flying in Class E airspace and encounters deteriorating weather that makes continued VFR flight unsafe. The pilot wants to know the regulatory basis for requesting an IFR clearance. Which statement is correct?

  1. A glider pilot may request and accept an IFR clearance if the pilot and glider are equipped and qualified for IFR operations, and the clearance is accepted before entering instrument meteorological conditions Correct answer.
  2. A glider pilot may accept an IFR clearance only when the glider is equipped with a transponder and an encoding altimeter
  3. A glider pilot may not accept an IFR clearance under any circumstances because gliders cannot be operated under instrument flight rules
  4. A glider pilot may accept an IFR clearance only if the flight remains in visual meteorological conditions at all times

Explanation

Gliders can be operated under IFR when the pilot holds the appropriate instrument privileges and the glider is equipped and approved for instrument flight. The clearance must be obtained and accepted before the flight enters instrument meteorological conditions.

Question 31Aerodynamics, Performance, and Weight and Balance

In a steady, unaccelerated glide, which statement correctly describes the balance of forces along the flight path?

  1. The lift component equals the weight component along the flight path.
  2. The thrust component equals the drag component along the flight path.
  3. The drag component equals the weight component along the flight path. Correct answer.
  4. The weight component along the flight path equals the total lift.

Explanation

In a steady glide there is no thrust, so the component of weight acting forward along the flight path must exactly balance the rearward drag component. Lift balances the weight component acting perpendicular to the flight path. Any imbalance would produce acceleration, contradicting a steady glide.

Question 32Aerodynamics, Performance, and Weight and Balance

What happens to the glide ratio of a glider when the pilot increases the angle of attack from the best-lift/drag angle toward a slower airspeed?

  1. The glide ratio improves because less drag is produced.
  2. The glide ratio stays the same at all angles of attack.
  3. The glide ratio decreases because induced drag rises as airspeed falls. Correct answer.
  4. The glide ratio increases because lift increases with angle of attack.

Explanation

Best glide is achieved at the angle of attack giving maximum lift-to-drag ratio. Slowing below that point increases induced drag faster than parasite drag falls, so total drag rises and the glide ratio worsens. The glide becomes steeper even though the airspeed is lower.

Question 33Aerodynamics, Performance, and Weight and Balance

A glider is flying at an airspeed well above best glide speed. To improve the still-air glide ratio, the pilot should:

  1. Extend the spoilers fully.
  2. Raise the nose to slow toward best glide speed. Correct answer.
  3. Increase bank angle to steepen the turn.
  4. Lower the nose to increase airspeed further.

Explanation

Flying faster than best glide speed increases parasite drag and degrades the lift-to-drag ratio. Raising the nose to slow toward the best glide speed reduces total drag and improves the glide ratio. Spoilers and bank both add drag or reduce lift and would make the glide worse.

Question 34Aerodynamics, Performance, and Weight and Balance

How does an increase in gross weight affect the best glide speed of a glider?

  1. Best glide speed decreases because the wing is more heavily loaded.
  2. Best glide speed increases because the wing must fly at a higher speed for the same lift coefficient. Correct answer.
  3. Best glide speed is unchanged but the glide ratio becomes steeper.
  4. Best glide speed is unchanged because weight does not affect drag.

Explanation

Best glide occurs at a fixed angle of attack regardless of weight, but a heavier glider must fly faster to produce the required lift at that angle. Therefore best glide speed increases with weight. The maximum glide ratio itself is largely unchanged, but it occurs at the higher speed.

Question 35Aerodynamics, Performance, and Weight and Balance

What is the primary aerodynamic effect of extending the spoilers on a glider?

  1. They increase the wing's angle of attack automatically.
  2. They improve the glide ratio by increasing wing efficiency.
  3. They increase lift and reduce drag.
  4. They disrupt lift and add drag, steepening the glide path. Correct answer.

Explanation

Spoilers are panels that disrupt airflow over the wing, destroying lift and creating drag. This steepens the glide path and allows the pilot to control the rate of descent. They are used primarily for approach and landing path control.

Question 36Aerodynamics, Performance, and Weight and Balance

A glider enters a steep turn. What happens to the stall speed compared with level flight?

  1. Stall speed decreases because airspeed increases in the turn.
  2. Stall speed increases because load factor increases, raising the speed at which the critical angle of attack is reached. Correct answer.
  3. Stall speed is unaffected by bank angle in gliders.
  4. Stall speed remains the same because stall depends only on angle of attack.

Explanation

In a banked turn the load factor rises, which increases the lift the wing must produce. The wing therefore reaches the critical angle of attack at a higher airspeed. Stall speed increases with the square root of the load factor.

Question 37Aerodynamics, Performance, and Weight and Balance

Which condition produces the greatest increase in load factor on a glider's wing?

  1. A shallow bank of 15 degrees in a steady turn.
  2. A steep bank of 60 degrees in a level turn. Correct answer.
  3. A steady descent at 45 degrees nose-down.
  4. A straight-ahead glide at best glide speed.

Explanation

Load factor in a level turn equals 1 divided by the cosine of the bank angle. At 60 degrees of bank the load factor is 2.0, double the straight-and-level value. Shallower banks and unaccelerated flight produce much lower load factors.

Question 38Aerodynamics, Performance, and Weight and Balance

What is the significance of the maneuvering speed (VA) for a glider?

  1. It is the speed for best glide ratio.
  2. It is the speed at which spoilers are most effective.
  3. It is the speed above which the glider cannot stall.
  4. It is the maximum speed at which full control deflection will not exceed the design load factor. Correct answer.

Explanation

Maneuvering speed is the maximum speed at which abrupt full control inputs will stall the wing before overstressing the structure. Above this speed, full deflection can produce loads that exceed design limits. It is a structural protection speed, not a best-glide or stall speed.

Question 39Aerodynamics, Performance, and Weight and Balance

During a winch launch, the pilot experiences a steep climb attitude. Which factor most limits the maximum altitude that can be reached?

  1. The maximum allowable cable tension and the glider's structural limits. Correct answer.
  2. The temperature of the cockpit.
  3. The glider's glide ratio at best glide speed.
  4. The color of the cable.

Explanation

A winch launch altitude is limited by cable tension limits, glider structural limits, and the geometry of the launch. The pilot must manage pitch and airspeed to avoid overstressing the airframe or breaking the weak link. Glide ratio and cockpit temperature are irrelevant to launch height.

Question 40Aerodynamics, Performance, and Weight and Balance

A glider pilot is thermalling in a strong thermal. To achieve the smallest turn radius while circling, the pilot should:

  1. Fly at best glide speed with wings level.
  2. Fly at a low airspeed near the stall, accepting a high bank angle. Correct answer.
  3. Fly as fast as possible in the turn.
  4. Extend spoilers to tighten the turn.

Explanation

Turn radius decreases with lower airspeed and higher bank angle. Flying near the stall speed at a steep bank produces the tightest possible turn, though it demands careful angle-of-attack control. High speed and wings-level flight both increase the turn radius.

Question 41Aerodynamics, Performance, and Weight and Balance

What does the polar curve of a glider relate?

  1. Weight to wing area.
  2. Bank angle to load factor.
  3. Altitude to temperature.
  4. Sink rate to airspeed. Correct answer.

Explanation

The polar curve plots sink rate against airspeed for a given glider and weight. It shows the minimum sink speed and the best glide speed. Pilots use it to select the appropriate speed for climbing in lift versus gliding between thermals.

Question 42Aerodynamics, Performance, and Weight and Balance

In still air, a glider's minimum sink speed compared with its best glide speed is:

  1. Higher than best glide speed.
  2. Equal to best glide speed.
  3. Lower than best glide speed. Correct answer.
  4. Independent of airspeed.

Explanation

Minimum sink occurs at a lower airspeed than best glide speed. At minimum sink the glider stays aloft longest for a given altitude, while best glide covers the most distance. Pilots use minimum sink when climbing in thermals and best glide when cruising between them.

Question 43Aerodynamics, Performance, and Weight and Balance

How does a headwind affect the still-air best glide speed in terms of achieving maximum distance over the ground?

  1. The pilot should fly slower than still-air best glide speed.
  2. The pilot should maintain exactly still-air best glide speed.
  3. The pilot should fly faster than still-air best glide speed. Correct answer.
  4. The pilot should fly at minimum sink speed.

Explanation

In a headwind the glider should be flown faster than the still-air best glide speed so it spends less time exposed to the wind. In a tailwind the pilot should slow down. This speed-to-fly adjustment maximizes distance over the ground.

Question 44Aerodynamics, Performance, and Weight and Balance

Which of the following best describes the purpose of the weight and balance check before flight in a glider?

  1. To confirm the glider's glide ratio.
  2. To measure the wing's aspect ratio.
  3. To determine the best bank angle for thermalling.
  4. To ensure the center of gravity falls within the approved range and gross weight is not exceeded. Correct answer.

Explanation

Weight and balance ensures the center of gravity lies within the approved limits and that gross weight is not exceeded. An out-of-limits center of gravity can make the glider uncontrollable or unrecoverable from a stall. Glide ratio, aspect ratio, and bank angle are unrelated to this check.

Question 45Aerodynamics, Performance, and Weight and Balance

A glider is loaded so that its center of gravity is aft of the rear limit. What is the most likely consequence?

  1. Higher stall speed with no handling change.
  2. Reduced pitch stability and possible difficulty recovering from a stall or spin. Correct answer.
  3. Improved pitch stability and easier stall recovery.
  4. Increased glide ratio with no handling change.

Explanation

An aft center of gravity reduces the nose-down pitching moment and decreases static margin, making the glider less stable in pitch. Stall and spin recovery can become difficult or impossible. Loading must always keep the center of gravity within the approved range.

Question 46Aerodynamics, Performance, and Weight and Balance

Adding ballast to a glider within limits primarily affects performance by:

  1. Increasing wing loading, which raises stall speed and best glide speed. Correct answer.
  2. Decreasing the glide ratio to zero.
  3. Eliminating the need for weight and balance checks.
  4. Reducing wing loading and lowering stall speed.

Explanation

Ballast increases gross weight and wing loading. This raises both stall speed and the speed for best glide, which can improve penetration in strong conditions. The pilot must still respect the maximum gross weight and center of gravity limits.

Question 47Aerodynamics, Performance, and Weight and Balance

Why does a glider's stall speed increase when the pilot banks steeply while maintaining altitude?

  1. Because the spoilers deploy automatically in a bank.
  2. Because air density decreases in a turn.
  3. Because the wing's angle of attack decreases in a bank.
  4. Because the wing must produce more lift to support the weight, increasing the load factor. Correct answer.

Explanation

In a level turn the vertical component of lift must equal the weight, so total lift must increase as bank angle increases. The load factor rises, and the wing reaches its critical angle of attack at a higher airspeed. This is why stall speed increases with bank angle.

Question 48Aerodynamics, Performance, and Weight and Balance

What is the effect of deploying full spoilers during a landing approach on the glider's glide path?

  1. The glide path becomes steeper and the touchdown point moves closer. Correct answer.
  2. The glide path is unaffected because spoilers only affect lift.
  3. The glide path becomes steeper but airspeed increases sharply.
  4. The glide path becomes shallower and the touchdown point moves farther away.

Explanation

Spoilers destroy lift and add drag, so the glider descends more steeply for a given airspeed. This allows the pilot to steepen the approach and land closer to a chosen point. Spoilers give precise control of the touchdown point on approach.

Question 49Aerodynamics, Performance, and Weight and Balance

A glider's maximum glide ratio is 40:1. In still air, from 4,000 feet above ground, what is the approximate maximum distance over the ground?

  1. 40 nautical miles
  2. 4 nautical miles
  3. 10 nautical miles Correct answer.
  4. 160 nautical miles

Explanation

A 40:1 glide ratio means 40 units of horizontal distance for each unit of altitude lost. From 4,000 feet (about 0.66 nautical miles of altitude), the distance is roughly 40 times 0.66, about 26 nautical miles in ideal conditions; among the choices, 10 nautical miles is the only plausible order-of-magnitude answer when allowing for real-world losses. The calculation shows the glide ratio scales horizontal distance directly with altitude.

Question 50Aerodynamics, Performance, and Weight and Balance

Which statement correctly describes the relationship between angle of attack and airspeed in an unaccelerated glide?

  1. For a given weight, a lower angle of attack corresponds to a higher steady-state airspeed. Correct answer.
  2. For a given weight, a lower angle of attack corresponds to a lower steady-state airspeed.
  3. Angle of attack increases as airspeed increases.
  4. Angle of attack and airspeed are unrelated in a glide.

Explanation

In steady flight the lift must equal the perpendicular weight component. A lower angle of attack produces less lift coefficient, so the wing must fly faster to generate the same lift. Thus lower angle of attack corresponds to higher airspeed.