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Hot answers tagged aircraft-performance

9

The limitation is always the lower one of the two, meaning your actual IAS must be below Vmo and your actual Mach must be below Mmo. Let us consider this case: you accelerate all the way to Vmo and climb at that fixed IAS. Two things are happening now: The TAS is increasing because the air is getting less dense. The speed of sound is decreasing because the ...

7

Those motors are only 4 hp each. I think you need a bit more juice to fly a Cri-Cri than 8 hp. The original's engines totaled 30 hp. Which means you need two 12 Kw motors. You need to then figure out where to put the batteries such that if they catch fire you won't turn into a roman candle. And once you have the motors and controllers and batteries and the ...

4

One engine has a diameter of 2.96 m, the area is 6.88 m2. Airplane speed of 486 kts is 250 m/s. The density at FL280 is 0.493070 kg/m3. @ Q1) In case there are 2 engines (not specified), having each an intake flow of (assuming that the column of air is sucked into the engine without inlet spillage (drag)):  \dot m = {\rho\times \dot V = \rho\times A\times ...

3

The flaperons' deflection when used als trailing edge flaps is controlled based on the landing gear handle position, the ALT FLAPS switch position, the airspeed and the mach number, but is independent of whether the aircraft is airborne or on the ground. When the landing gear handle is placed in the DN (down) position or the ALT FLAPS switch is placed in the ...

2

I worked one in about 1989 that was flying eastbound toward Rapid City, and started his turn back toward Edwards. He rolled out over GLL VORTAC, so about 200 nautical miles south of where he started. He was at roughly 2400 knots (He slowed down for the turn). Altitude was above FL600, but we did not get information on actual altitudes.

1

In order to calculate the radius, assuming an immediate change to 30° bank is a good first order assumption. Robert is right. If you want to be more precise, you need to model the initial roll movement. Aileron deflection will happen within 1 second and rolling might maybe take another 2 seconds. Next, shortly before the desired roll angle is reached, ...

1

As it takes only a few seconds for an airliner to roll into a turn, the act of rolling in will not significantly affect the calculation of turn radius. "Full bank", generally not exceeding 20-30 degrees with passengers (who wish to be comfortable), will an importantant factor. Even more critical will be airspeed, which for an airliner, will be ...

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