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"Who said it doesn't? Of course it changes. The Lift force has to equal the weight of the aircraft. The amount of lift generated is a function of airspeed and angle of attack. Lift does not increase just because the aircraft weighs more. So, if two aircraft are identical other than weight, the lighter one glides further."
Incorrect ! Absolutely wrong!
Glide ratio (L over D or L/D) is NOT affected by aircraft weight. The glide ratio is a factor of the physical form of the aircraft; the drag produced by the aircraft shape & profile and the lift produced by the wings.
Those factors do not change and we are speaking of aircraft best glide ratio, so, by definition, while producing the least drag which means landing gear retracted & flaps up, referred to as "clean".
Aircraft manuals (POH- pilot operating handbook) that list glide ratio & often the speed at which to fly to achieve best glide ratio (greatest distance the aircraft will fly) always refer to aircraft maximum gross weight. If the aircraft weighs less, the best glide speed will be lower.
A rule of thumb; for every 10% (1%) below gross weight, reduce speed by 5% (.5%) to achieve best glide speed.
A Cessna 172 empty weight is about 69% of maximum gross weight. W/ min. fuel and 150lb pilot the plane weighs about 76% of gross, so 24% less weight = 12% reduction in speed to arrive at best glide, reducing best glide from 65 kts at gross weight to 57kts at minimal weight.
This can be significant and determine if the plane reaches the planned touchdown point.
Conclusion is, a heavier aircraft will glide the same distance as a lighter aircraft (of identical make/model) but it will need to be flown at a higher speed to do so.
Yes, the lift produced is a function of airspeed & angle of attack
as best glide ratio is a function of angle of attack (AoA). So a specific AoA must be achieved to insure best glide / longest distance over the ground.
The most perceived difference between lighter and heavier aircraft is, the heavier aircraft arrives in the same spot, faster.
The same effects are in play with air density and higher altitude.
Air is thinner, less lift and less drag, but Lift over Drag (L/D) is still a factor of the physical structure, shape/ profile and the lift produced by the wings.
This does not change when the air is thinner.
I do not have information as to how to adjust the speed for best glide ratio
as altitude increases and air density decreases.
It is amazing how many pilots and aviation professionals do not understand this.
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How does the weight of an object change when it is taken to the moon?
I would weigh 30lbs 5.9oz.Well your weight on earth is given by the equation weight = mass x gravity. The different gravity constant on the moon is what changes your weight, but your mass remains the same. The weight formula on the moon would be the same only with the different gravity constant. So putting these equations together we get:weight on moon = mass x gravity constant of moonweight on moon = (weight on earth/gravity constant of earth) x gravity constant of moonThen we plug in the gravity constants and get the final conversion equation:weight on moon = (weight on earth/ 9.8) x 1.6Note: The constants are given with the units m/s2 but because they cancel each other out, you can enter your weight with any units and solve for your weight on the moon in the same units.Hope this helps!Well actually you have no weight on the Moon you just are weightless because there is no gravity...About 1/6 of your weight on the Earth. The weight on the Moon is about 1.6 Newton/kilogram.nope, weight is relative to gravitational force. The astronaut would have the same mass though.
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19
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The escape velocity is given by √2gR Hence it's value Ve on the earth and Vm on the moon is Ve = √2ge.Re Vm = √2gm.Rm Therefore , their ratio = Ve/Vm = √ge.Re/√gm.Rm = √6 x 10 = √60 = 8 nearly
The ratio of the earths gravity to the suns gravity?
No meaningful comparison is possible without specifying that the distance from both bodies will be the same at the moment of measurement. If you measured the acceleration due to gravity (or your weight) some distance from the sun, and then measured the acceleration due to gravity (or your weight) at the same distance from the Earth, you would find that the measurement in the vicinity of the sun is about 332,982 times the corresponding measurement at the Earth. It doesn't matter what the distance is, as long as both are the same.
Will the flight of a paper airplane be altered if the weight changes?
Yes, weight may affect a paper airplane by increasing its mass. This may alter its glide ratio and change its wing loading.
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It is important because it is essential for for climbing of aircraft. There is a limit for thrust to weight ratio. When an airplane exceeds it, it cannot climb effeciently.
What is the importance of lift to drag ratio?
In aircraft aerodynamics, the lift-to-drag ratio, or L/D ratio, is the amount of lift generated by an aerofoil, divided by the drag it creates by moving through the air. A higher or more favourable L/D ratio is typically one of the major goals in aircraft design; since a particular aircraft's required lift is set by its weight, delivering that lift with lower drag leads directly to better fuel economy, climb performance, and glide ratio.
Why do wing length and plane weight matter with paper airplanes?
The combination of wing area and plane weight affect a paper airplane's glide ratio and range.
Do heavier airplanes fly faster?
Not necessarily. The aircraft with better power to weight ratio will fly fastest.
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Fly the airplane at L/Dmax speed. This is also know as best glide. This speed is found in the POH and represents where induced and parasite drags are at there minimal values for the airplane.
Why is duralumin use in aircraft?
duralumin is low density alloy, it has a high strength to weight ratio making it ideal to use in aircrafts.
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Lift/Drag x Height loss
How is a glide ratio calculated?
To calculate the glide ratio, you divide the length it was thrown, e.g. 150cm, by the height it was thrown, e.g. 50cm. So 150/50=30cm so, it would be 30:1.
Did the weighthp ratio of a 71 318cui charger be diiferent if the actual weight was 3350 and not 3750?
The weight to BHP ratio would change, if either the weight or BHP changed - unless they both changed by the same percentage...
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It's weight to strength ratio which makes it an ideal metal for aircraft and the automotive industries .
