Va Maneuvering
Hi gents,
I am a student pilot, finished ATPL, building hours on DV20 Katana.
I have a question regarding Va.
Va on the Katana is 104kts according to the AFM.
As Va is SQRT(n) times clean stall power off speed at max weight, it is for katana SQRT(4,4) times 43kts (clean) which is....90 knots.
I can not understand where the 104kts came from, which is 5,8G loading.
The only thing that I found is that by law, VS√(n) ≤ VA ≤ VC.
According to an FAA circular:
VA should not be interpreted as a speed that would permit the pilot unrestricted flight-control movement without exceeding airplane structural limits, nor should it be interpreted as a gust penetration speed. Only if VA = VS √(n) will the airplane stall in a nose-up pitching maneuver at, or near, limit load factor. For airplanes where VA > VS√(n), the pilot would have to check the maneuver; otherwise the airplane would exceed the limit load factor.
This paragraph, confirms that statements on flight manual are not accurate about allowance of full or abrupt movements of control stick at Va. (OR I am missing something they accounted for, which I dont know)
Also, in CS23 there is a paragraph, saying same things.
Maybe this is something to do with ultimate and limit load factor, but again, it doesnt make sense.
If 4,4g is the limit load factor, so the ultimate load factor should be 4,4 times 1,5 which is 6,6g.
Maybe I am missing something.
Can anyone help?
Last edited by Lantirn; 1st Mar 2013 at 17:05.