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

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39 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
130 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
112 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
254 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
3k views

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 ...
5
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1answer
182 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
140 views

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 ...
3
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0answers
130 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
159 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
434 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
205 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
166 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
102 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
176 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 ...
10
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2answers
724 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
184 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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2answers
244 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 ...
3
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1answer
131 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
204 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
537 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 ...
6
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1answer
165 views

Does EASA allow IFR, NVFR or SVFR in gliders?

Is it legally possible in Europe to get clearances for IFR, night VFR or special VFR while flying gliders? Specifically, I'm interested in sailplanes, powered sailplanes and ultralight sailplanes (...
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8answers
6k views

Why are winches not used for towing commercial planes up?

In this video a glider is pulled up by a winch on the ground, like this: (Source) I would say you could apply the same principles with bigger planes, possibly even using sustainable energy sources. ...
5
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1answer
115 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 ...
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2answers
433 views

What kind of flaps are used in gliders?

I'm estimating some wing parameters for an imaginary airplane (simple college project). We are allowed to use coefficients for any basic types of flaps (plain/split/slotted/Fowler etc), but since I'm ...
0
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1answer
215 views

Would it be possible to use a magnetron beneath glider plane to generate its own thermals?

Would it be feasible to install a series of magnetrons or something else on the underside of a gliders fuselage and wings in order to heat the air beneath the glider and ultimately cause the glider to ...
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2answers
622 views

What does the pressure distribution over a glider's wing look like?

Can someone explain the design of glider wing airfoils and the subsequent pressure distribution over them? I hypothesize that: The pressure distribution should form a resultant force in the forward, ...
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2answers
285 views

Is it possible to obtain the lift and drag coefficients of a 3D body in ANSYS Fluent?

Is it possible to obtain the lift and drag coefficients of a three dimensional body in ANSYS Fluent? Or, would it be acceptable to take the coefficients of several cross-sections along the wings and ...
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2answers
259 views

What is the best distance glider that can carry a 200 lb load?

Good morning, I'm an emigrant from Worldbuilding and I ask this first question in part to help me discover what I don't know I don't know. My definition of best: Longest recorded single flight time ...
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4answers
570 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 ...
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2answers
214 views

How much does it cost to add a glider rating to a PPL? [closed]

In Europe, how much does it cost to learn to fly gliders if you're already a private pilot? I am one, so I already have the medical and theory etc. but what cost can I expect for a GPL on top of a PPL?...
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2answers
429 views

Can I take friends flying with a private pilot glider license?

In the US, will glider clubs let you take up friends in a two-seater if you have a private license? Or do you need a commercial license?
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3answers
1k views

What is the difference between Glider (aircraft) and Glider (sailplane) [closed]

While looking glider on Google, the fist page lists the two separate Wikipedia pages Glider (aircraft) and Glider (sailplane) What is the difference between a glider and a sailplane?
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2answers
504 views

How can we calculate the benefit gained from taping glider wing roots?

Most (all?) glider pilots will be familiar with the practice of taping wing roots. As most of the gliders in my glider club (and I would guess, in the world) are stored with the wings detached, the ...
5
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2answers
438 views

Can glide ratio be increased with bi-wing configuration?

We all know that increasing the wingspan of an aircraft tends to increase the glide ratio. Instead of increasing the wingspan, could an extra wing of the same size or less as in a bi-wing ...
4
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2answers
404 views

What is the meaning of the percentage used to describe the thinness of this glider's airfoil?

In a glider review for the Schempp-Hirth Discus, I encountered the following paragraph: The Discus 2 airfoil is thin (about 14.5 percent), incorporating studies by K.H. Horstmann and Dr. Wuerz (...
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3answers
448 views

How should I deal with a cable break at low level during a glider winch launch?

What should I do when rope breaks at 220-360 ft [75-120m] when there is not sufficient runway to land ahead and not sufficient altitude to make a return manuover and land with the wind direction?
4
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3answers
795 views

What's the maximum bank angle of a glider?

I know that stall speed and wing load increase with the angle of the turn and I have experienced 65 degrees turns in a glider (demonstrated by an instructor). Let's say a collision is imminent (or we ...
4
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3answers
368 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 ...
18
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2answers
3k views

Why are the wingtips of sailplanes painted red?

Gliders are painted white (I suppose for thermal reasons), except for some shapes on the fuselage (generally blue or red, but it seems the color does not matter). And the aircraft registration is dark,...
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1answer
1k views

When flying a glider in emergency situation, would it be more safe to bailout or to land in a forest?

Is there any consensus when it comes to this question? If it depends then it depends on what exactly? I'm interested in the decision making in this kind of situation.
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2answers
1k views

Do negative flaps increase glide ratio?

If I understand correctly, gliders uses negative flaps while crossing between 2 thermals, but I don't understand why. For me: positive flaps decrease sink rate but increase drag and thus worsen glide ...
2
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1answer
147 views

How can I determine the amount of trim drag?

I fly an ASW27, which is a 15 meter glider with flaps. I am flying with the CG at 62% aft. I use down flaps while in a thermal and climbing; negative (up flaps) are used in cruise between thermals. ...
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2answers
2k views

How is a glider recovered and returned to an airport after landing in a field?

If a glider has a safe normal landing in a cow pasture or other farm field and has no damage, how is it typically recovered to be returned to an airport for a future flight? Are the wings designed ...
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2answers
475 views

How can seagulls slide in the wind without flapping their wings?

There are a lot of seagulls in a park near where I live. Sometimes I can see them somehow "sliding" forward or backward diagonally when flying against the wind, however, their wings aren't flapping. ...
2
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1answer
280 views

What is the sink rate of a glider during a roll?

For a glider in a steady bank at angle $\mu$, to a good approximation, the sink rate has a factor $1/\sqrt{\cos \mu}$ relative to the sink rate at zero bank angle. What are the dynamics of the sink ...
7
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4answers
306 views

Why has the range of movement of the control surfaces changed over the past year?

During the annual inspection on our glider, we discovered that the maximum downwards extension of the right aileron (i.e. full left stick) was outside the manufacturer's tolerance. The measured value ...
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3answers
642 views

Could an airplane dock with a set of wing extensions while airborne?

I figure there are limitations to wingspan while on the ground but could we engineer wings that stay aloft or get towed to allow a plane to 'dock' with them in order to fly higher/longer/more ...