New answers tagged aircraft-performance
4
votes
How much difference in drag there is between a feathered and non-feathered airplane?
The increase in drag is quite substantial. The non-feathered blades continue to spin. They are connected to the in-operative engine, so the engine keeps turning over. You continue compressing air ...
- 15.5k
3
votes
STOL AIRCRAFT in Flight
Not saying such a thing would be totally impossible, but nope.
Look up the width of the cargo bay of a C5, then look up the wingspan of your favorite STOL plane that you had in mind for this question.
...
- 27.2k
0
votes
Kvochur Bell Manuever practicality
The Kvochur bell would indeed have no purpose because the modern missiles like the AIM-9 Sidewinder and AIM-120-AMRAAM are very precise and usually dont't miss unless the enemy pilot flies into the ...
- 149
4
votes
Does an airplane fly less or more efficiently after a mid-flight engine failure?
In a vehicle with 4WD, you have one engine driving all the wheels. This drivetrain contains gears, universal joints etc. that have friction. In this case, disconnecting drive to two of the wheels ...
- 10.3k
1
vote
I don't quite understand the derivative in this vertical wind gust formula
The derivatives are the same because it doesn't make a difference what causes the change in angle of attack.
Normally, a plane will change its angle of attack when it maneuvers or changes speed. In a ...
- 236k
2
votes
I don't quite understand the derivative in this vertical wind gust formula
The slides are indicating how lift coefficient $C_L$ changes with angle of attack $\alpha$ a few ways.
First, they conceptualize it as a discrete (finite) change in lift coefficient $\Delta C_{L_{gust}...
- 15.5k
13
votes
Does an airplane fly less or more efficiently after a mid-flight engine failure?
Fuel consumption for OEI is significantly higher per mile.
Refer to this question for an example of fuel flow: Does one-engine cruise consume less fuel than two-engine cruise?
There's an 8% reduction ...
- 28.2k
35
votes
Accepted
Does an airplane fly less or more efficiently after a mid-flight engine failure?
In almost all cases, the maximum range is reduced.
This is because the in-operative engine causes substantial drag. In addition, it causes an asymmetric flight condition that requires deflection of ...
- 15.5k
3
votes
Accepted
How are individual spool optimal speeds determined in 3-spool engines like Trent 700/800?
The most determinant factor is air pressure varies along the compressor stages, and along the turbine stages. This requires adjusting the air duct cross-section, and in turn the blade size, which ...
- 76.5k
0
votes
what is best approach to make high thrust from nozzle side? higher velocity or higher pressure?
The answer to this question depends on whether you are considering an engine for a supersonic high performance aircraft -- or a subsonic aircraft that requires good fuel efficiency.
A subsonic ...
- 15.5k
0
votes
For a fixed density altitude, how does climb performance depend on pressure altitude?
Good question. Bottom line is, since rate of climb (ROC) is a function of true airspeed (and lift, thrust, & weight), the best ROC airspeed (Vy) does vary with non-standard atmospheric conditions. ...
- 415
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