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Questions tagged [glide-ratio]

The ratio of the forward distance traveled to the vertical distance an aircraft descends when gliding without any power.

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What is the glide ratio on the CE-S550 Citation S-II?

I couldn't find it in the AFM. Is it different then the square winged citation II?
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1answer
106 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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1answer
242 views

How useful would the space shuttle OMS actually be in atmosphere?

When speaking of space shuttle landings, they always mention that it is "very poor glider, with one shot, no go-arounds." Of course this is true; however, if the Shuttle found itself in a situation ...
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1answer
400 views

Best glide speed vs. best glide angle? Maximum glide range?

I have some open questions regarding best glide in a descent: I understood, that there is a best glide speed. This best glide airspeed occurs at the highest lift-to-drag ratio (L/D). This best glide ...
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1answer
245 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
129 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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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
207 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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3answers
283 views

Does it help to climb in case of a partial engine failure?

When the engines of a airplane show irregularities that do not reduce performance but indicate a possible failure of the engines, is it useful to climb to a higher level, to increase the glide length ...
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59 views

How long can a passenger aircraft glide without engine power? [duplicate]

Assuming that the aircraft is cruising at 36000 ft and lost engine power, how long could a passenger aircraft glide?
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2answers
1k views

What would be the best alternative during a dead-stick approach?

(Disclaimer: I am not a pilot so my understanding of things may be really broken) If a plane has lost engine power, has limited altitude to work with, and is upwind of a landing strip, and the pilot ...
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0answers
720 views

What is the glide ratio of a DA42?

I was looking for the best glide speed of a DA42 with both engines out, but it seems it's not in the POH. In the emergency checklist, it only mentions a speed of 85 knots to maintain on final approach ...
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2answers
551 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 ...
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2answers
2k views

How can I calculate the glide time for a B737 with engine failure?

We talked today in our flight school about the following scenario: if I climb in my 737-800 to FL100 and then have a dual engine failure, how many seconds would it take me before I reach ground? I'm ...
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2answers
557 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 ...
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2answers
2k views

During an engine failure should I deploy 10° of flap or keep it clean?

Imagine I have an engine failure in cruise flight with a Cessna 152 or 172. Should I select 10° flap to increase glide angle? Would it give me more range to reach safety?
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2answers
12k views

Where can I find (or how can I calculate) the glide ratio for a PA-28-181?

I'm filling out ForeFlight's new glide slope feature, and I'm trying to find the glide ratio for a Piper Archer II (PA-28-181). I know the best glide speed is 76, but can't find the glide ratio. Any ...
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2answers
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What was the Space Shuttle's glide ratio?

The Space Shuttles glided to a landing in the atmosphere after reentry. They were not good gliders, aerodynamically speaking, so their glide slope angle was rather steep. What was the glide ratio of ...
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5answers
4k views

Could a big plane glide significant distances, same a ordinary glider (1000 km or about)?

Seems that a usual glider is not limited by its glide descent rate and can fly much more than this. It uses air masses that move upward to gain the altitude. Are these effects limited by the size of ...
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1answer
550 views

How is the glide ratio affected when converting a wheeled plane to floats?

I'm looking for published data that describe the effect on glide ratio when an aircraft is converted from wheeled to float configuration. I suspect that the glide ratio goes down considerably due to ...
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1answer
557 views

Where can I find glide ratios for commercial aircraft?

I know that light aircraft have poor glide ratios (typically 1:10) compared to commercial aircraft (typically 1:20 or above). I was wondering if there is a source where one can find the glide ratio by ...
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1answer
403 views

How can planes with the same stall speed and power-to-weight ratio have such different takeoff field length, climb rate, glide ratio, etc?

I am interested in better understanding the performance differences between different planes that seem to be similar in many important ways but that differ greatly in performance. For example, take ...
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2answers
485 views

Does full nose up trim yield best glide in Cessna 172/152 for a given load?

I heard from a ground instructor that full nose up trim will yield best glide in a 152 and 172. As I understand best L/D, a lighter loaded plane will require a slower glide than the same craft ...
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1answer
575 views

Is V(L/D)max equivalent to glide speed regardless of weight, engine, height, etc.?

I've read Carson's paper on V(L/D)max, and while theoretically interesting, it does not seem to me to be useful in actually finding the V(L/D)max of an arbitrary aircraft, as it assumes knowledge of ...
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0answers
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Is there a way to approximate the best glide speed for maximum glide distance in a headwind during flight? [duplicate]

Flying at an airspeed corresponding to an aircraft's maximum glide ratio in calm air will maximize the distance covered for a given altitude (AGL). But in a headwind, the horizontal velocity would be ...
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2answers
408 views

What is a mushing glide?

Source: Wolfgang Langewiesche - Stick and Rudder; An Explanation of the Art of Flying Why is it called a mushing glide? In this glide, does the aircraft point its nose less (or more?) steeply? How ...
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2answers
6k views

Could a commercial plane like Airbus A320 glide with no working engines from 11000 meters? [duplicate]

I have heard that pilots learn in simulators to fly also commercial planes without working engines, so that they glide. And still I have the impression, the chances that a plane could float from 11000 ...
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2answers
2k views

How to calculate the Glide Ratio from Drag & Lift?

I know that $c_{d}=0.03 + 0.095c_{l}^2$. What is the glide ratio?
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1answer
514 views

How can the glide ratio in a balanced turn be estimated?

I am trying to estimate the bank angle/turn radius required to lose a given amount of altitude during a full orbit. This has led me to trying to estimate glide ratio in proportion to $L/D_{MAX}$ of an ...
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2answers
5k views

How are the glide polar and L/D ratio charts related?

We know from other questions and answers that airplanes and gliders in particular can have their performance described in terms of glide polar and Lift-to-Drag ratio. As it appears from the images in ...
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7answers
44k views

How far can airplanes glide?

On an another question, an answer said: You don't need an engine to fly as airplanes are designed to glide without it. I suspect this heavily depends on the type of the aircraft, so lets assume we ...
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3answers
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How does the Boeing 787 Dreamliner's glide ratio compare to other airliners?

I just saw a documentary on the design of the Boeing 787 "Dreamliner" and one of the designers said that the wings were inspired by gliders. Looking at the production version of the plane, it is ...