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CP vs AC?
What is the difference between the Aerodynamic Center and Center of Pressure?
/Tim |
iirc:
c.p. – is the point along the chord where the distributed lift is centered. a.c. – is the point along the chord where lift changes (or the sum of lift changes)take place c,p. is rather static and a.c. will move depending on aoa, dyanmic pressure (q), and other variables. Hope this helps as a starter, someone else I'm sure can expand and/or clarify further. |
Originally Posted by AirDawg
(Post 2986836)
iirc:
c.p. – is the point along the chord where the distributed lift is centered. a.c. – is the point along the chord where lift changes (or the sum of lift changes)take place c,p. is rather static and a.c. will move depending on aoa, dyanmic pressure (q), and other variables. Hope this helps as a starter, someone else I'm sure can expand and/or clarify further. but... I'm a bit confused... according to my books the CP moves with AoA as well as TAS. As an example when accelerating through the transonic region, the CP shifts from about 25% chord to 45% chord... And the CLmax vs AoA diagram, doesnt it show the CP movment compared to AoA? |
Originally Posted by AirDawg
(Post 2986836)
iirc:
c.p. – is the point along the chord where the distributed lift is centered. a.c. – is the point along the chord where lift changes (or the sum of lift changes)take place c,p. is rather static and a.c. will move depending on aoa, dyanmic pressure (q), and other variables. Hope this helps as a starter, someone else I'm sure can expand and/or clarify further. |
Originally Posted by pstaney
(Post 2986981)
Other way around. Center of pressure will change with mach and aoa. It is aerodynamic center that really doesn't change, theoretically calculated at exactly 25% MAC, but typically between 23 and 27%. There was a very informative thread on this a year or 2 ago. Keith Williams explained it well.
I tried to find the thread but was unable to do so by searching for posts with his name... :( |
You're right, quite hard to find. Not much on C of P, but has AC info. Here it is, should work.
http://www.pprune.org/forums/showthr...itching+moment |
Originally Posted by pstaney
(Post 2987226)
You're right, quite hard to find. Not much on C of P, but has AC info. Here it is, should work.
http://www.pprune.org/forums/showthr...itching+moment Again PPRuNe proves to be the place to find answers to most questions, I'm very impressed with this forum and the people here =) |
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