Questions tagged [glider]

A glider is a heavier-than-air aircraft that is designed to be operated in unpowered flight.

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1answer
73 views

How to calculate or design glide ratio? [duplicate]

Was interesting to watch the explanation about glider here, especially about the glide ratio. Glide ratio is defined as the ratio between altitude when it start gliding (Y-axis) to the distance it can ...
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2answers
162 views

How does the glide ratio change with velocity in a glider with air brakes deployed?

I'm interested in how the glide ratio steepens when increasing velocity, starting from the best slope (best L/D) velocity, in a high drag configuration (air brakes fully extended on a glider). I've ...
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1answer
68 views

Does lift coefficient for maximum range change for a glider experiencing headwind?

When a glider or unpropelled aircraft experiences headwind, I understand that the flight velocity and sink velocity for the "new" maximum possible range both increase (see velocity polar from How does ...
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846 views

Why do gliders have bungee cords in the control systems and what do they do? Are they on all control surfaces? What about ultralights?

Why do gliders have bungee cords in the control systems and what do they do? Are they on all control surfaces? Why don't ultralights have them?
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1answer
314 views

How should a glider pilot handle inadvertently entering a foreign country?

Typically, when an aircraft lands on a different country than its departure, it has to land on an international airport. There many services are provided like customs, passport control etc, to make ...
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10answers
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What is the most 'environmentally friendly' way to learn to fly?

As this question indicates, I've been thinking recently about the environmental impact of flying (since when automated cars are the only means of ground transport, aviation will be responsible for ...
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1answer
179 views

Would all these three things have the exact same effect on the flight duration of a glider?

Consider a glider trimmed to fly at some given angle-of-attack, gliding in smooth air (no thermal convection, ridge lift, wave lift, etc.). If air density is somehow kept exactly constant in all ...
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4answers
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Are glider winch launches rarer in the USA than in the rest of the world? Why?

I had heard before that winch-launching gliders was a relatively rare practice in the USA, while quite common in the rest of the world. My data is mostly anecdotal, but I do know gliding clubs in ...
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3answers
453 views

Consequences of stalling while sideslipping in a glider? [duplicate]

In a glider, sometimes it's useful to do a side slip with crossed controls. However, when that happens, the pitot tube angle is out of line and the ASI goes to zero, therefore losing any indication of ...
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1answer
96 views

Are loops or rolls allowed in the “utility” category in any US-certified airplane or glider?

In actual practice, is there any US-certified airplane or glider where the approved flight manual, or cockpit placards, indicate that loops, rolls, or any other similarly aerobatic maneuvers other ...
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329 views

In the US, would it ever be legal to fly a loop in any airplane or glider that was operating in the “utility” rather than “acrobatic” category?

1) In the US, would it ever be legal to fly a loop in any US-registered airplane or glider that was operating in the "utility" category rather than the "acrobatic" category? (Assuming that no special ...
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5answers
269 views

Would the benign spiral maneuver be one alternative to dealing with being “stuck above” or inside a cloud?

Recently I provided an alternate answer to a question involving "hands off" recovery techniques. In this I briefly illustrated the benign spiral maneuver. For completeness I will reiterate what I ...
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Are gliders susceptible to bird strikes?

Gliders don't travel at the high speeds that make bird strikes so devastating in airliners. However, they are also smaller, lighter and softer, and can still move pretty swiftly. Are they also ...
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1answer
182 views

How are electronic instruments and other equipment powered in a glider?

Radios and other electronic devices must be battery-powered. What sort of battery - and does its capacity impose a limit on flight duration, or can they be recharged in flight with a turbine?
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1answer
114 views

What type of license do you need to solo a glider in the UK?

What type of license do you need to solo a glider (cross-country) in the UK? Wikipedia states that: There is no government-issued licence at present, but EASA regulations will require one by 2015. ...
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How hard would it be to convert a glider into an powered electric aircraft?

How hard would it be to convert a glider into an powered electric aircraft? I'm thinking something that looks like this: Would it be as simple as mounting two electric motors and props to the wings ...
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Will dual-learning in a glider make my airplane learning safer?

This question got me thinking, would attending gliding lessons at the same time as my airplane training make me safer in a small plane or microlight?
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1answer
167 views

Which pilot license is required in the US to engage in glider towing?

As a former member of a US glider club (I live in Europe now, and it's all winch launches), I always thought being a tow pilot was a good way to build time. Can a private pilot tow gliders in exchange ...
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9answers
2k views

Is a vertical stabiliser needed for straight line flight in a glider?

My team is designing a glider and I am unsure about whether or not to include a vertical stabiliser. The task the glider must complete is to achieve the largest possible displacement in a straight ...
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4answers
5k views

Is it normal for gliders not to have attitude indicators?

This answer shows a picture of and describes a "modern" glider instrument panel, with two variometers, airspeed indicator, altimeter, compass, temperature gauge and radio controls. Notably (at least ...
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2answers
221 views

What are the best places to gain the most altitude in a glider?

I'm a beginner pilot and I started with gliding. How to spot the best thermals and what is the most efficient way to climb?
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478 views

Are these questions really on the FAA Glider Commercial written test?

I'm currently working on my Commercial Glider rating and for the written, I am using a popular test prep package. The package allows the specific selection of Commercial Glider (vs Airplane, ...
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1answer
252 views

Could Falcon 9 fairing become glidable / flyable?

Reading and thinking about this and this questions on space exploration stackexchange, I was wondering if the fairing could shape itself, so that it becomes one stable and steerable gliding element ...
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1answer
303 views

How safe are sail planes? [closed]

I think sailplanes have to be pretty safe. Because if it falls it will gain speed, which will be converted to lift. So unless you do something stupid sailplanes can't just fall out of air. Am I ...
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1answer
200 views

Aerodynamics and fuel consumption of a powered glider

I want to optimize the flight distance of a powered glider model airplane, without the use of soaring. I've studied some aerodynamics books, but still feel unsure about my conclusions. Please tell me ...
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4answers
371 views

What would be a simple aerodynamics simulation software for a student? [closed]

I have a project due 2 weeks from now that demands we make a glider using Styrofoam. I'd like to simulate the results as I plan my glider before I build it. Which simple software, which allows ...
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1answer
241 views

What are the takeoff and landing distances of motor gliders?

I'm doing some estimations of weight and thrust loading for a college project, and in the formula below the landing distance is not a variable, but should be estimated using similar aircraft and usual ...
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1answer
1k views

Which airfoil would be optimum for a glider?

The glider I am designing has a mission requirement to fly for as much time as possible. It will fly in the low Re range of about 150,000 to 250,000. While comparing different airfoils I am looking ...
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2answers
3k views

Is there an abnormal condition that could have caused this fatal accident involving a stall?

In 2009, a Grob 103 glider stalled and crashed at Richmond Field, Michigan, killing the passenger but not the pilot. (NTSB accident report: CEN09LA353) The accident occurred after a failed winch ...
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263 views

How to deal with turbulence while flying glider? (Cautions in applying rudder)

I just watched video explaining how the American Airline Flight 587 crashed It led me to think about glider flying. The cause of that crash was that the first officer ...
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150 views

What should I look for in weather reports in order to pick a day for glider flying?

I understand weather can change unexpectedly, and local sky condition (e.g. cloud types) can't be predicted, but if I want to fly glider at a specific location, say, some time next week, and use ...
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2answers
405 views

What's a typical first lesson of glider flying like?

What is a typical first lesson for glider flying like? Does it usually include a pre-flight mini lecture on basic theories at all, or if not pre-flight, do instructors usually spend some time on the ...
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6answers
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What happens if only rudder is applied in a turn without ailerons? Do the two have to be applied together all the time?

Fresh newbie in glider flying. I was told the joystick (aileron) and the pedal (rudder) should always be applied together when making a turn. My question is, what happens if I only pedals the rudder ...
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1answer
234 views

Why are many early gliders high-wing designs as opposed to newer designs?

Many early gliders were designed with a high-wing configuration. An example of this is the K 8, but many more of the same and previous generations follow this configuration. Later generations (e.g., ...
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1answer
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Can hours accumulated in a glider count towards the 1500 hours for an ATP certificate?

If you have ratings in Glider, ASEL, AMEL do all your PIC hours in all categories count towards an ATP certificate, or must the Glider hours be kept separate?
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1answer
2k views

Is it safe to fly a glider when I can't move the stick fully left and right?

This past Saturday, I started training in a Schweizer 2-33A glider. When I got in the glider for the first time, I found that I couldn't move the control stick fully left and right, because my legs ...
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1answer
208 views

How do I calculate new minimal speed for a glider when I put water into the tank?

Lets say a glider weights 400kg and has a minimal speed of 70km/h. When it has additionally 100l water, so in total 500kg, what is the new minimal speed? I would argue, that in order to reach the ...
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1answer
423 views

Why is polar curve of a glider dependent on flight load?

This is my first question here. I'm just a glider in education phase and not yet a pilot, but because I'm also physicist, I'm interested in some details more than other people. My question is simple:...
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3answers
643 views

Is this paragraph about the dihedral effect in the FAA's Glider Flying Handbook correct?

I've been reading the FAA's Glider Flying Handbook, 2013 (FAA-H-8083-13A). In chapter 3 ("Aerodynamics of Flight"), the book is discussing stability. On page 3-12, it states: Dihedral is the upward ...
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3answers
417 views

Distance of downwind leg from runway in glider landing pattern?

Is there guidance from the FAA or AGA on the distance of the runway from the downwind leg of a landing pattern for a glider? For powered aircraft, the FAA recommends in its flying handbook (FAA-H-...
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4answers
215 views

Do any gliders carry GPWS?

Do any gliders come with a ground proximity warning system (GPWS)? I realise that, for a glider, a GPWS probably wouldn't be able to help quite as much as in a powered aircraft, since a glider, by ...
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3answers
229 views

What is the effect of fuselage weight on a model glider?

I've built a model glider and wanted to see the effect the weight of the fuselage had on its performance. It flew the further with more weight which seems counter intuitive. I can exert more force ...
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1answer
435 views

Do I need to obtain a student pilot certificate to transition from Glider to Sport Pilot?

I am a current Private Pilot Glider, and will soon begin training to obtain my Sport Pilot Licence. My question is about the requirement to obtain a student pilot certificate to solo in the training ...
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2answers
3k views

Are there any data on the safety rate of gliders vs single-engine GA aircraft?

Can anyone point me to statistics on the safety record of gliders vs. single engine general aviation aircraft?
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8answers
7k views

Why aren't any wingsuits able to sustain flight?

I'm aware that under zero power it is a glider, but there are gliders that sustain flight and have enough lift to climb etc (Edit: this is not always true. See below answers for why). So, would it not ...
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3answers
275 views

Are frisbees and boomerangs technically gliders?

Frisbees and Boomerangs are heavier-than-air, unpowered, and fly through the air. So are they technically gliders? They also rotate, so I wonder if these are actually some kind of rotorcraft-type ...
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472 views

Does anyone know an equation relating wingspan to gliding distance for a glider?

I found this equation online but it is not from a reputable source and has no derivation. Could anyone help me by deriving this equation or even verifying its accuracy? I would love to cite and use ...
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1answer
230 views

Can I apply for ASEL and Glider class ratings at the same time?

I would like to get both FAA Private ASEL and Private Glider class ratings. I was told I could take lessons for both ASEL and Glider at the same time under a Student certificate. Can I apply for a ...
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1answer
248 views

Why aren’t airliners powered gliders? [closed]

The Perlan high altitide glider project has the following stats This suggests that a glider / high altitude airliner could be economically viable and save a lot on fuel at 60000ft. I realize this ...
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2answers
873 views

Are transport gliders used by modern armies?

Famous WW2 operations involved transport gliders, for troops landing and vehicles transportation behind front lines. Gliders were cheap and quiet aircraft. The advantage over individual parachutes ...