Madder
9th Sep 2010, 08:53
Hello guys
I am an instructor but did some reading and it kind of made me uncertain as to what is true and what really happens when flying with a CS prop.
Tried to post my question in a different forum, but no one really gave it a shot so I decided to take it to a higher level = You guys :)
Ace the Pilot Techical Interview's definition, and CS in general:
Regarding CS/VP propeller he gives the following statement, of course taken from a larger context:
"A variable-pitch propeller maximizes the propeller's efficiency through a large speed range by maintaining a constant blade angle of attack that thereby produces a constant thrust value."
In a sentence above this one, he states the complete opposite using almost the same words.
What are your thoughts on that statement?
- My own would be that a CS prop changes its propeller PITCH constantly to maintain a given revoultion setting, correcting either for increased/decreased airspeed or MP.
- I just started wondering if the statement was correct in the sense that when the factors airspeed or MP are changed, in effect the propeller AOA also changes, and to maintain a given RPM setting it changes it's pitch to maintain that AOA creating the same amount of propeller drag giving the same resistance to maintain the set number of revs.
I am an instructor but did some reading and it kind of made me uncertain as to what is true and what really happens when flying with a CS prop.
Tried to post my question in a different forum, but no one really gave it a shot so I decided to take it to a higher level = You guys :)
Ace the Pilot Techical Interview's definition, and CS in general:
Regarding CS/VP propeller he gives the following statement, of course taken from a larger context:
"A variable-pitch propeller maximizes the propeller's efficiency through a large speed range by maintaining a constant blade angle of attack that thereby produces a constant thrust value."
In a sentence above this one, he states the complete opposite using almost the same words.
What are your thoughts on that statement?
- My own would be that a CS prop changes its propeller PITCH constantly to maintain a given revoultion setting, correcting either for increased/decreased airspeed or MP.
- I just started wondering if the statement was correct in the sense that when the factors airspeed or MP are changed, in effect the propeller AOA also changes, and to maintain a given RPM setting it changes it's pitch to maintain that AOA creating the same amount of propeller drag giving the same resistance to maintain the set number of revs.