New answers tagged aircraft-performance
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What velocity is used to calculate maximum range and maximum endurance?
This is sort of a "do my homework" request, but it may be helpful to realize holding a constant angle of attack will mean a faster airspeed with a full tank and a slower airspeed with 100 ...
- 18.7k
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Can vortex ring state (VRS) be solved by shaping the blades so that the vortexes they produce are weak enough not to form a vortex ring?
Vortex ring state (VRS) is a blade root stall phenomenon that occurs in rapid descents. In a normal rapid descent, there is a small amount of airflow UP through the center of the rotor disc right at ...
- 125k
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Does the ground effect change with temperature changes?
I will assume:
You are asking about the temperature of the air near the ground, not the temperature of the ground itself.
The ground effect is the pressure caused by compression of air between the ...
- 2,327
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Does the ground effect change with temperature changes?
No. There is nothing in the physics of ground effect that depends on temperature.
On a hot day, you will have higher density altitude. Your true approach speed will be greater (for the same ...
- 6,191
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Can vortex ring state (VRS) be solved by shaping the blades so that the vortexes they produce are weak enough not to form a vortex ring?
No. VRS isn't about the tip vortices you are thinking of.
VRS is a thing even if you had a pure actuator disk. I.e. it is a fundamental phenomena of powered lift. It has everything to do with disk ...
- 6,191
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Question about V1 Vr V2 computations
That's correct.
V1 has to do with acceleration and stopping, and both of those are affected by headwind/tailwind and runway slope.
VR is the (air) speed at which you want to start flying, and so head/...
- 48.5k
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Confused about screen height definition
For takeoffs is this screen height measured above the departure end of the runway (or above the end of the clearway if any)
For the takeoff distance available calculation, yes this is correct
or it’...
- 14k
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If I am at absolute ceiling, can I climb further by trading airspeed for altitude?
A more understandable approach may be to take out the engine for a moment and look at a Vbg glide. Pulling back on the stick briefly reduces the glide angle, but greater drag will eventually increase ...
- 18.7k
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Can supercharger/turbocharger increase absolute ceiling
Although forced induction can increase the absolute ceiling from an aircraft performance point of view (the definition of the term), keep in mind that there may be other restrictions on the maximum ...
- 6,191
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If I am at absolute ceiling, can I climb further by trading airspeed for altitude?
Yes, you can zoom climb. While you have no excess power to sustain a climb, if you just pull back you can gain altitude briefly. You will rapidly lose airspeed and will stall if you attempt to keep ...
- 10.9k
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If I am at absolute ceiling, can I climb further by trading airspeed for altitude?
Vx and Vy converge at the absolute ceiling, at an airspeed that is higher than stall speed. So yes, you can still pull back on the stick or yoke and temporarily climb a bit. Of course, you will soon ...
- 21.4k
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If I am at absolute ceiling, can I climb further by trading airspeed for altitude?
At the absolute ceiling, you have no extra engine power to push you through the air any faster, so you cannot add lift to climb by pushing the power lever further forward - you are already maxed out.
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- 20.4k
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Can supercharger/turbocharger increase absolute ceiling
A turbocharger or supercharger increases the available power, and thus the climb rate, at all altitudes. The absolute ceiling is just where the maximum possible climb rate reaches 0 fpm, so increasing ...
- 10.9k
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What are the key differentiating factors between the flight control systems employed in unmanned drones and those utilized in piloted aerial vehicles?
The primary difference is liability, which drives a chain of other items.
There is an expectation of the various parties involved in approving, licensing and insuring aircraft that there is a clearly ...
- 1,582
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Why is the initial short-field climb below Vₓ in a Cessna 172?
Small GA POHs can be fairly sloppy (and your checklist seems even looser, what is your Vr? Why are you going rich after full throttle?).
POH's often will fail to properly define things. For example is ...
- 2,574
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