Questions tagged [glider]

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

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4
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1answer
166 views

How can a designer maximize the glide ratio of an aircraft with low aspect ratio wings, other than by increasing the aspect ratio?

As I understand it, the gliding range is given by a lift to drag ratio—hence to increase the gliding range, I would want to increase the lift and reduce the drag as much as possible. To that end, ...
2
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1answer
37 views

What is the threshold between high Aspect Ratios and low Aspect Ratios?

Oftentimes when describing flying organisms and vehicles, their wings are said to have a "high aspect ratio" or a "low aspect ratio". Sometimes the papers (that I read) gave the numbers, but more ...
3
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1answer
104 views

What are the advantages/disadvantages of a forward-folding propeller?

The AMS Carat A is a motorglider with a forward folding propeller. To my knowledge, this is the only production plane with this characteristic. The most popular self-launching gliders with front ...
2
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0answers
282 views

How big is the radar cross section of a modern glider?

I heard somewhere that modern glider made of plastic and composite materials are less detectable than other aircraft by primary radar. I wonder how much. What is the radar cross section of a typical ...
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1answer
90 views

Do pilots ever intentionally land a monowheel glider on the main wheel and a wingtip wheel in crosswind conditions?

Do pilots ever intentionally strike a wingtip when landing a mono wheel glider in gusty crosswind conditions? I understand the Lazair changed from a mono wheel to a standard tail dragger layout for ...
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4answers
220 views

When do the lift and drag vectors contribute a force component along a glider's path of travel as seen from the ground?

It is often said that the lift vector helps to propel a glider forwards. The lift vector has no component acting parallel to the glider's trajectory through the airmass, but in many cases the lift ...
5
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7answers
1k views

An airplane has an engine that pushes its flight. What force pushes a glider to fly? [duplicate]

An airplane has an engine that pushes its flight. What force pushes a glider to fly? Is it gravity? I think the flight of a glider is driven by gravity, but some people disagree with me. They say ...
5
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1answer
160 views

Do gliders make a better pilot? [closed]

I've often heard that learning to fly gliders makes you a better airplane pilot, in person and in answers here and here. Is this true, and if so, what specifically is it about gliders—or at least ...
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0answers
54 views

Why does increasing a glider's weight using water ballast improve its speed and performance? [duplicate]

I was studying gliders and how they fly. There is a point that's not clear to me: why does using water ballast improve the performance/speed of a glider? If I understand correctly, my glider jumps ...
0
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1answer
62 views

Does the FAA construe FAR 91.225 to prohibit aircraft w/o electrical systems w/o ADS-B-out from flying above 10,000' MSL unless below 2500' AGL?

Does the FAA construe FAR 91.225 as imposing a general prohibition on flight above 10,000' MSL (excluding airspace below 2500' AGL) in aircraft without ADS-B-out, even for aircraft without engine-...
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2answers
88 views

Is it harder to get a first pilot certificate in a motorglider compared to a normal powered aircraft (near St. Paul, MN.)?

Is it harder to get a first pilot certificate in a motorglider (glider - self launch) vs. normal powered aircraft near St. Paul, MN. It seems like a self launch glider certificate would be a great ...
1
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1answer
119 views

How do I choose the correct params?

I am very new to airplane design. I am working on this project to design a flying wing glider (no propeller) that would glide in a circular pattern with a fixed radius of 250 m after being released at ...
1
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1answer
64 views

What parameters to focus on when constructing a wing for turning? [closed]

I want to construct a flying wing (glider) with the sole purpose of performing a helical turn (or a circular turn with no propulsion attached) with somewhat of a fixed radius. What should be the main ...
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1answer
91 views

How to decide the wing span? [closed]

How would you decide the wing span for a delta wing glider? Also how would it relate to the main chord length?
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3answers
167 views

How to glide in a circular pattern?

I was just curious as to how you would make a glider glide in a circular pattern ( or helical ). Will there be a large difference when considering a conventional glider vs a delta wing glider?
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0answers
43 views

If a glider had human pedal powered propellers how much extra distance could you go? [duplicate]

Imagine an amateur cyclist could generate 100 watts of power (professional ones can do 200-300), would it be possible to put that to use in a glider to fly further? For example you pedal for 15 ...
1
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1answer
217 views

What is the differance between gliding for maximum range and gliding for maximum endurance? [duplicate]

Is there a difference between gliding for maximum range vs. endurance? Is the glide speed the same for max. endurance and max. range?
8
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4answers
3k views

Why are the wings of some modern gliders tadpole shaped?

Why are the wings of some modern gliders tadpole shaped, rather than teardrop shaped? An example is the Schleicher ASG 29. Or did they just add a flat plate at the trailing edge for the flaps and ...
2
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1answer
524 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 ...
2
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1answer
242 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 ...
3
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1answer
147 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 ...
10
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2answers
975 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?
6
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2answers
551 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
5k views

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 ...
5
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1answer
189 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
4k views

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 ...
6
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3answers
600 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 ...
2
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1answer
223 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 ...
2
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2answers
456 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 ...
2
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5answers
355 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 ...
15
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3answers
4k views

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 ...
4
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1answer
208 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
182 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. ...
9
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5answers
4k views

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 ...
8
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2answers
2k views

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?
2
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1answer
205 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 ...
7
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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 ...
29
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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
252 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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2answers
592 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, ...
3
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1answer
262 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
446 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 ...
1
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1answer
359 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
687 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 ...
1
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1answer
367 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 ...
3
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6answers
953 views

What produces thrust along the line of flight in a glider?

After reviewing discussions and vector diagrams of gliders in flight, the vertical lift component and the vertical drag components seem to produce a steady state, 0 acceleration balance with gravity. ...
1
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1answer
2k 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 ...
16
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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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2answers
318 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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2answers
177 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 ...