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Results tagged with airspeed
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user 1961
The speed of an aircraft relative to the air. Among the common conventions for qualifying airspeed are: indicated airspeed ("IAS"), calibrated airspeed ("CAS"), true airspeed ("TAS"), equivalent airspeed ("EAS") and density airspeed.
9
votes
What is the relation between airspeed and altitude at fixed throttle setting in a private jet?
The basic principles needed for an answer are:
Thrust varies linearly with air density.
Lift at constant angle of attack (AoA) equally varies linearly with air density.
Increasing the angle of attac …
- 237k
3
votes
What is the relation between maximum airspeed and engine power?
Your thinking is correct if thrust won’t change with speed. But it does.
Since you prescribe power, I have to assume a piston or turboprop engine. In that case, thrust is power divided by speed and yo …
- 237k
13
votes
Why do some military aircraft use variable-sweep wings?
Swing wings combine the high sweep angle helpful for Mach 2+ flight with tolerable low-speed handling characteristics. They were needed to fulfil the demands on military aircraft called for in tenders …
- 237k
1
vote
When to slow down to Va for turbulence?
If the load factor from the next vertical gust is likely to exceed the maximum load factor of your aircraft it is time to slow down. Now you might wonder how to know the strength of the next gust. If …
- 237k
12
votes
Accepted
What would be the stall speed of Solar Impulse?
Solar Impulse has no flaps and a high aspect ratio wing. Therefore, the c$_{l_{max}}$ of the wing should be no higher than 1.8, most likely 1.6. While a rigid airfoil can be designed with a higher c$_ …
- 237k
4
votes
Accepted
What determines the maximum speeds for a particular aircraft?
A quick list:
Maximum speed with flaps at maximum deflection (v$_{FE}$)
Maximum speed with flaps at take-off setting. Fly faster and the flaps might be torn off.
Maximum speed with gear down (v$_{LE …
- 237k
11
votes
Accepted
How close is the air resistance or drag force to being proportional to the airspeed squared?
Subsonic aircraft drag is composed of two major components:
Pressure drag. Most of this is induced drag, but also some is from viscous effects which result in less pressure on the rear sections of a …
- 237k
18
votes
What is the fastest possible transatlantic flight today?
If you prefer something more realistic and readily available, go with the fastest business jet, the Cessna Citation X, or if you need a little more range, the Gulfstream 650. The Cessna can cruise at …
- 237k
4
votes
Accepted
Significance of $\frac{C_L^{3/2}}{C_D}$
Gliders fly at their minimum sink speed when $\frac{c_L^{3/2}}{c_D}$ reaches its maximum.
Propeller airplanes fly at their maximum endurance speed and their best climb speed when $\frac{c_L^{3/2}}{c_D …
- 237k
8
votes
Why do Vx and Vy coalesce at an airplane's absolute ceiling?
The absolute ceiling is defined as the altitude where climb speed drops to zero. This implies that there is only one speed at which the airplane does not lose altitude. Flying any faster or slower wil …
- 237k
9
votes
Accepted
How is V_S0 calculated for anything less than maximum weight?
All aerodynamic forces are proportional to the dynamic pressure, which is the product of air density $\rho$ and half of the square of flight speed $\frac{1}{2}v^2$. If your flight mass is reduced, red …
- 237k
2
votes
What are typical airspeeds and lift coefficients for UAVs at different flight stages?
Short answer: The lift coefficient in all flight stages is high (0.8 to 1.4) while the true airspeed depends on the altitude. …
- 237k
5
votes
Accepted
What is the bank angle that should be sustained to move in a uniform circular motion?
I hope you also appreciate help that uses the metric system. You should. It makes the calculation much simpler.
So your question is: What bank angle $\varphi$ do I get when flying a circle of a known …
- 237k
29
votes
Accepted
Why did the Solar Impulse flight take so long?
At sea level, the optimum range speed is only 9.96 m/s or 35.86 km/h, just about its take-off airspeed. …
- 237k
4
votes
Accepted
How can the zero-lift drag coefficient (parasitic drag) be calculated?
Yes, the wetted area is roughly twice the reference area. Now details depend on how well the reference area captures the exposed area of the wing - dihedral will already increase the wetted area by a …
- 237k