Questions tagged [sailplane]

Use with [glider] for sailplanes: a type of glider intended for soaring and designed with conventional aerodynamic control surfaces, else use [glider] only.

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Why do you pull back on the stick in a forward slip?

In a forward slip (I'm learning to fly sailplanes, if that matters), quite a lot of back pressure is needed to keep the nose up in a forward slip. Why, aerodynamically speaking, is this the case? I ...
Sanchises's user avatar
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Minimum Sink Rate in Sailplane

How do gliders ascend (either with an engine or thermal) at best rate of climb if it is very close to stall? Or they move up by sacrificing that best Rate of Climb. In image the best CL^3/CD is ...
andy's user avatar
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Program to make glider polars

I was using flow5 to make some speed polars for a glider with real dimensions, however I read about PGEN (polar generation software) that could simulate the thermal effect, but apparently it is an ...
andy's user avatar
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Incidence angle in Sailplane

I am determining the shape of the fuselage of a sailplane and I found something that gives me a little conflict, and that is that in most sailplanes it has an inclined tip, I read that this helps ...
andy's user avatar
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Design glider without aileron

What difficulties would it take to build a glider without ailerons? I read that "if you can control the turns with the rudder maybe you don't need ailerons." Well, apart from the fact that ...
andy's user avatar
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Use twist to improve stall characteristics in ideal distribution of lift coefficient

Is practical use twist (geometric or multiple airfoils to improve stall characteristics) when it has lift coefficient distribution ideal or near due to wing plataform? I am analyzing a "Schuemann&...
andy's user avatar
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Cruise-climb in glider with electric motor?

I have been looking for the definition of cruise-climb for gliders that use an electric motor, but so far I have only been able to find a definition based on liquid fuel. I'm asking because that ...
andy's user avatar
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Trailing edge tapered and leading edge straight

It is true that a wing with a straight leading edge and a tapered trailing edge has good stall characteristics?. That is, we can assure that when it enters stall, it will first be at the root and then ...
andy's user avatar
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Effect of wing flexible in stall

How true is it that the deflection (due to large aspect ratio, flexible wing ) of a wing has a certain effect on the stall characteristics? I read about this in the case of large wingspan gliders. ...
andy's user avatar
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4 votes
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Irrational acrophobia-like anxiety caused by wave soaring

This will probably sound utterly bonkers to many and I feel very awkward coming out with this publicly - I'm a gliding instructor with 650 hours flying experience, and I'm scared of heights. It's ...
Toby Wilson's user avatar
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104 views

Making sailplane go faster

Sailplanes have much higher L/D than jetliners. But they are three times slower. Is it practical to make a vanilla sailplane glide at 600mph by lifting it to a ridiculous altitude? If so, what would ...
Abdullah is not an Amalekite's user avatar
6 votes
3 answers
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Are there any recreational gliders with a yoke?

All gliders / sailplanes seem to use a single central stick to manipulate the primary control surfaces. In other airplane types, we also find yokes and sidesticks. Are there any glider designs, ...
Sanchises's user avatar
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How is a "turning polar" constructed?

To start with something familiar: here's a flight polar. As we learned, the best glide speed is found by starting at the 0,0 point, and drawing a line tangent to the sink rate line. The intersection ...
Xpector's user avatar
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What is the nature of the glider's vario lag?

I learned that glider's vario reading lags behind the vertical speed of the airmass. For example, when flying a steady circle and having a thermal not quite centered yet, the vario is reading a ...
Xpector's user avatar
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8 votes
4 answers
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How to prevent dizziness when thermalling in the back seat?

I recently started learning to fly sailplanes. I am usually quite resistant against airsickness, both when flying commercially as well as flying in the front seat of a sailplane (either when the ...
Sanchises's user avatar
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What are the three different altitudes shown in the Perlan II?

The Perlan II glider has two altitude indicators and an altimeter on the navi screen, each showing different altitudes: How is each of the altimeters different? One indicator certainly shows MSL and ...
Giovanni's user avatar
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1 answer
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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?
Giovanni's user avatar
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Why don't [most] sailplanes use whole-airplane / ballistic parachutes?

My understanding is that sailplanes usually have the pilots wear the parachute on their back, requiring the pilot to bail out of the aircraft before they can use the parachute. Given the maturity of ...
Nikita's user avatar
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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 ...
quiet flyer's user avatar
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2 votes
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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,...
quiet flyer's user avatar
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16 votes
5 answers
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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 ...
Camille Goudeseune's user avatar
1 vote
1 answer
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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 ...
Giovanni's user avatar
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12 votes
2 answers
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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 ...
Giovanni's user avatar
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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 ...
Abdullah is not an Amalekite's user avatar
2 votes
2 answers
530 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 ...
quiet flyer's user avatar
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1 answer
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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 ...
Fred's user avatar
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3 votes
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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 ...
Pavlo D's user avatar
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5 votes
1 answer
296 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 ...
quiet flyer's user avatar
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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 ...
Julian's user avatar
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725 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 ...
Self-Made Man's user avatar
1 vote
1 answer
1k 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 ...
rafal.sz's user avatar
16 votes
2 answers
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 ...
Tanner Swett's user avatar
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1 vote
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817 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 ...
gadfly's user avatar
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2 votes
2 answers
1k 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 ...
gadfly's user avatar
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16 votes
6 answers
12k 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 ...
gadfly's user avatar
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11 votes
6 answers
7k 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 ...
GypsyCosmonaut's user avatar
13 votes
3 answers
3k views

Do thermals stop rising when clouds are formed?

Glider pilots know that one indication of thermal lift is the formation of cumulus-type clouds. My question is: Does the rising air (that lifted the moisture to form the the cloud) stop rising after ...
benglish's user avatar
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8 votes
1 answer
1k views

What PPL routes are available with gliding experience?

I'm an early solo glider pilot, with the long term goal of also obtaining a PPL (not a LAPL(A)). I am planning to do this after I have obtained at least my bronze badge, which I aspire to within the ...
webdevduck's user avatar
3 votes
1 answer
249 views

Can a kite take advantage of crosswinds to gain speed? [closed]

In a form off a kite can wind be redirected like a sail boat in any direction? Can cross winds around a jet stream be helpful in speed in such a design?
user avatar
18 votes
2 answers
2k views

When is a sailplane a sailplane?

A simple question that I could not find an answer to: When is a sailplane a sailplane (from a regulatory point of view), especially a powered one of the TMG (touring motor glider) variety? EASA has ...
Monolo's user avatar
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