Is the relationship between prop. blade angle of attack and speed; proportional or inversely proportional?

Answer 1

On an airplane with a constant speed prop, the governor attempts to keep the angle of attack constant. As speed increases, the angle of attack decreases, so the RPM wants to increase. The governor increases the blade angle to increase AOA back to its original setting.

On an aircraft with a fixed pitch propeller, as speed increases, the RPM will increase because the angle of attack is reduced, thus less drag. As the RPM increases, the angle of attack increases to an angle very close to the original angle. It will be a slightly smaller angle of attack, because you are losing some power to the increased drag due to the increased RPM.

Both of the above scenarios assume a fixed power setting.

Answer 2

If you are talking about constant speed props, the blades are close to flat during high rpm operation, and turn more into the wind as rpm is reduced. At 2450 rpm on my plane, the blades are at (if I'm remembering correctly) 16 degrees. When I pull the props back to 1850 for cruise, the blade angle is around 23 degrees (again, the memory thing). Since I'm not totally sure if you're talking about prop speed or aircraft speed, I'll let you figure it out.

After note: The props don't change speed of rotation as a function of aircraft airspeed. That's why they're called constant speed. If I set rpm at 2000 rpm, it doesn't matter if I'm climbing or diving, the props hold 2000 rpm.

Answer 3

There is not a set proportion... so you cant say they are proportional but they are related because the higher the angle of attack, the less direct the thrust, less direct the thrust, slower speed... If I had to say one of the two I would say directly, as one goes down, as does the other... but its not a proportion because it depends on many other variables such as wind speed and direction... You want low angle of attack for max efficiency, thats as simple as I can make it...

Answer 4

I believe that angle of attack doesn't change as airspeed increases, (unless you were talking about a rotary wing acft) But the propeller's influence over the air going through it is reduced as airspeed increases, so I'm inclined to say that the angle of attack is reduced with it as well. summation: inversely proportionate Take that as you will I'm a helicopter guy that's the best i have.

Answer 5

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Answer 6

If you don't know the diff and temp varients and lift don't get in a plane

Answer 7

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