On Feb 13, 5:23*am, "Paul" wrote:
I'm trying to find out a formulae regarding the gap between Takeoff
Distances by POH and real-life measures. I did the maths for wind,
temperature, pressure altitude, runway slope, weight, etc. It's quite
detailled and effective...

But...

The only calculation I don't know how to "translate" is the difference, in
feet, between the POH speed and the speed I did during the test.

For example: If my airplane took off at 1050 feet on the initial roll, at 62
knots, how many feet will I need if left the runway at 56 kts ? POH states
it requires only 699 feet at 56kts for the same factors (temp, press, etc)!

I think you will struggle to find a simple calculation ( or a
difficult one for that matter) . why dont you just try testing your
takeoff distance at the same speed as the POH reccomends? May I ask
what aircraft you are flying? and what did you find with your
mathematical studies, and did you read my earlier thread on
"Confusion with Cessna take off distance " where I found that after
converting pressure ht and temperature to density altitude that there
was still a temperature effect on the take off distance required. I
would be interested to know if you saw something similar wtih your
data?.

Terry
PPL Downunder