Questions tagged [glider]

Use for gliders; combine with specific tags, e.g. [sailplane], if required.

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10
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2answers
319 views

Why are gliders oftentimes not equipped with a transponder?

Oftentimes gliders are not equipped with transponders (at least in Europe). Even if they are, they do not necessarily operate it at all times. This is allowed by SERA.13001: (a) When an aircraft ...
17
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1answer
3k views

Are there any gliders that can fly over the Himalayas?

Do gliders (sailplanes) use ridge and wave lift in the Himalayas to go to extreme altitudes, possibly above Everest's peak?
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2answers
119 views

For a PPL, do I pursue gliders or airplanes first? [closed]

I'm interested in pursuing a Private Pilot's License. I'm interested in both gliders and powered flight. Gliders look like fantastic fun and powered flight would be an amazing thing to have – I could ...
0
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0answers
54 views

What is the heaviest payload a modern theoretical glider could carry?

Let's define a glider as any plane with a better than 0.75m/s minimum sink rate. Let's also assume it meets all EASA requirements for load factors and handling. Knowing that the spar is an important ...
2
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1answer
57 views

Does the FAA or FCC recommend 123.5 as the preferred frequency for air-to-air and air-to-ground use by glider pilots or balloon pilots?

Does the FAA or FCC recommend 123.5 as the preferred frequency for air-to-air and air-to-ground use by glider pilots or balloon pilots speaking to other glider or balloon pilots or ground support crew,...
1
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1answer
60 views

Do the soaring and/or ballooning communities in the US recommend 123.5 as the preferred frequency for air-to-air and air-to-ground use?

Does the soaring community (e.g. the Soaring Society of America) or the ballooning community in the US recommend 123.5 as the preferred frequency for air-to-air and air-to-ground use by glider pilots ...
15
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5answers
5k views

Why are 3- or 4-seat gliders so rare?

Sailplanes capable of climbing in rising air (not troop transports, which can only descend after the towrope releases) have one or two seats. I know of only one type with more, the Schweizer SGS 2-32 ...
13
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3answers
10k views

How are thermals found?

As far as I understand glider pilots like to look out for thermals. I assume that when you are in one, you can perceive that and you can make roughly sure to stay in it. But what if you're not in a ...
0
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1answer
89 views

Feasibility and process for the approval of a modified glider [closed]

I am looking into a business idea that requires glider sized semi-automatic drones but I am very naive when it comes to the regulations and rigour of the aviation and airline industry, so I am hoping ...
1
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2answers
518 views

Does too big an angle of decalage make the horizontal stabilizer to stall?

This styrofoam airplane has two positions for stabilizer. When put in the upper one, the plane flies in a circle. Is the stabilizer now stalled because the decalage angle is very big?What happens with ...
8
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2answers
887 views

Where must the glider tow line connection be?

I have styrofoam glider and I want to pull it with a rope, to fly with me when driving a bike. Where do I need to connect the attachment point, if I want the glider to fly stable above me? I think, to ...
6
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3answers
2k views

Can gliders and single-engine planes have vortices?

I read, A third physical explanation of the source of induced drag is that the wing tip vortices contain a certain amount of rotational kinetic energy. This energy has to come from somewhere; indeed, ...
1
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1answer
218 views

Is the time spent flying in a Sailplane concidered a valid flight hour for a LAPL / PPL license?

I live in the Netherlands. In order to get a Light aircraft pilot licence (LAPL) license 30 flight hours are demanded, A private pilot licence (PPL) requires to have 45 flight hours. flying in a ...
2
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2answers
314 views

Do the rules used in modern soaring competitions forbid gyroscopic flight instruments, or forbid the use of AHRS-driven attitude displays, etc?

In the past, the rules for soaring competitions in the US and many other countries have not permitted gliders (sailplanes) to have working gyroscopic instruments installed, to prevent pilots from ...
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0answers
98 views

Does altitude affect glide ratio?

Lower altitude means higher air density, which means more liff, which means a glider can maintain a given glide slope at lower airspeed. As a rule, aircraft tend to have higher peak L/Ds at low ...
1
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1answer
108 views

Could the Perlan II glider be used for nearspace tourism?

I asked the same question about the SR-71 Blackbird, and I'm also curious about the Perlan II sailplane which travelled above 70,000 ft, and is planned to be flown to 90,000 ft, if it could be used ...
4
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2answers
167 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 ...
12
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2answers
3k views

Is it feasible to circumnavigate the Earth in a sailplane?

Would it be feasible and survivable to circumnavigate the Earth in a glider or sailplane without propulsion and without landing until the circumnavigation is completed, when you'd return to the same ...
10
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2answers
3k views

Why do the ailerons of this flying wing work oppositely compared to those of an airplane?

I made this simple wing glider and put some ailerons on it. I thought that the ailerons in this glider would work the same way it works on airplanes, wherein the roll will be in the direction of the ...
9
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2answers
3k views

Why do sailplanes have such large tails?

Since a sailplane is focused on performance - what with tricky laminar flow airfoils and all. Eo why this Instead of this It looks to me like that long tail is needed to balance the cockpit. Buy ...
0
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1answer
170 views

Is it fairly common for student glider pilots to have wing tip strikes, especially in gusty cross wind conditions?

Is it fairly common for student glider pilots to have wing tip strikes, especially in gusty cross wind conditions? I understand gliders are landed level, slow down and then the wing drops onto a wing ...
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0answers
71 views

What examples are there of top-mounted engine motor gliders?

I would like to know which motor gliders are there with regards to the following criteria: Top-mounted engine stowable landing gear great L/D ratio high maximum g-load at least 180kg usable weight? ...
0
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1answer
72 views

Is there any formula that directly relate density to altitude for a wide range of altitude?

I am working on a code to simulate a vehicle trajectory based on forces act on it in different altitudes, I need a formula that gives density in an altitude range between 0 and 40 km to obtain lift ...
0
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1answer
118 views

In what airspace may gliders fly in clouds in the UK without an IFR flight plan and without contacting any air traffic control facility?

In what airspace may gliders (sailplanes) legally be flown in clouds in the UK without an IFR flight plan and without contacting any air traffic control facility? Also, how high does this class (...
2
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6answers
626 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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5answers
5k 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 ...
1
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1answer
138 views

Does a RC glider always loop when launched?

In the below video, the guy sets "launch mode" for hand launch where he adds a little bit of elevator. Will a glider always loop up when launched horizontally, even if the tail is set to ...
4
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4answers
917 views

Gliding: why pulling the stick back in a spiral dive would tighten the turn?

I have recently done my spiral dive recovery lesson in a glider ASK21. The instructor taught me to level the wings first, then ease out of the dive by pulling the stick back. He said that pulling the ...
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2answers
168 views

In a full-rudder sideslip in a Schweizer 2-22 or 2-33 glider, is the descent rate higher at 50 mph airspeed than at 60 mph airspeed?

Is it really true that in a full-rudder sideslip in a Schweizer 2-22 or 2-33 glider, the descent rate is higher at 50 mph airspeed than at 60 mph airspeed? Likewise, is it really true that in a full-...
3
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1answer
108 views

What are "secondary precessional forces" that apply to boomerangs in flight?

note: This question is about the aerodynamics of boomerang flight and how it differs in microgravity environments. Some background information available here in Aviation SE: Are frisbees and ...
13
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2answers
5k views

Why are birdlike airfoils not used?

Here are two airfoils (lets focus on Re 100,000): SD7043-il which is simple to build and has a glide ratio of about 60 e376-il a birdlike and much harder to build if using paper or similar due to the ...
2
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6answers
548 views

Why can't you have sail-powered airplanes?

So, sailing boats take the kinetic energy of a crosswind and turn it into thrust by using their sails as lifting surfaces, and the discussion I had in the comment section of this question made me ...
10
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1answer
1k views

Why do glider licences have fewer restrictions than powered aircraft?

Under FAA rules a license for gliders doesn't require a medical certification and you can get your license at 16 rather than 17 for powered aircraft. You can get your student license two years sooner ...
6
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2answers
374 views

What determines spanwise placement of spoilers for roll control?

Specific application of spoilers was discussed in What is the benefit of spoilerons compared to ailerons? As I remember it, 40yrs ago gliders had spoilers close to the wing tips - perhaps slightly ...
1
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2answers
259 views

Can we show through simple geometry rather than formulae or graphs that the best glide ratio occurs at the maximum ratio of Lift to Drag?

For an unpowered glider, can we show through simple geometry involving force vector diagrams, rather than mathematical formulae or graphs, that the best still-air glide ratio is achieved at the angle-...
25
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2answers
5k views

Has any airliner ever collided with a glider?

I've read about many near-collisions between gliders and airliners, but did such a collision ever happen in mid-air, actually?
4
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1answer
475 views

Can the load factor during glider winch launch be measured with the G-meter?

I am looking at the flight envelope of a glider, the velocity - load factor diagram. I read that generally the air-frame, the G-meter and the pilot 'experience' the load factor as a G force (an ...
2
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3answers
274 views

Could gliders be a clean, practical alternative to other forms of transport?

Would it be possible to use pure gliders as an eco-friendly mode of transport? From what I have read so far, gliders can travel at a speed of 100-170 km/h. That would not be able to compete with a jet ...
29
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4answers
3k views

Can a glider make a go-around?

Since gliders don't have engines, is it possible for them to go around? Are there any extra features on a glider to try to prevent that situation from happening?
3
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1answer
158 views

How much altitude can a glider gain only from losing speed?

Say we have a glider flying near its top speed. If pilot decides to "trade speed for altitude" how much can it climb before hitting stall speed? Assuming pilot will use most effective climb ...
9
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5answers
4k 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 ...
10
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2answers
4k views

Can you ride a storm to save fuel?

Cargo sailboats, of the old, depended on wind direction. Like these ships, planes also save time by flying with the wind. On the extreme end, could a plane use storm fronts or hurricanes by flying in ...
5
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2answers
438 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?
10
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3answers
7k 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?
6
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1answer
996 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 ...
10
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6answers
5k views

What is the difference between a glider and a sailplane?

The words "glider" and "sailplane" seem to refer to similar or the same type of aircraft. In particular, the Wikipedia articles "Glider (aircraft)" and "Glider (sailplane)" seem to be describing the ...
8
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7answers
4k views

Plane that always flies into the wind?

Suppose that you dropped an uncontrolled, dummy glider into the air. You want it to always face into the wind by design. Would it be possible? If so, what would such a plane look like?
14
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4answers
1k views

Drop the rope or drag the rope?

I was the safety officer at a glider operation earlier this year and we had a new tow pilot who forgot to drop the rope. By radio, I instructed him to drop the rope before landing. The downsides of ...
2
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1answer
366 views

Does a glider pilot need to file an IFR flight plan to legally fly in cloud in class E airspace in the US?

Does a glider pilot need to file an IFR flight plan to legally fly in cloud in class E (controlled) airspace in the US? Or could he or she contact ATC and receive a clearance to enter cloud without ...
2
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2answers
191 views

What can be approach of balancing canard glider model?

There are a lot of instructions out there about balancing classic wing configuration glider models. The center of gravity should be approximately 25% to 30% from the front edge of the wing, which is ...