Sylvain a écrit :
Grandss wrote:

If someone can explains me how to determine this two coefficient.


May I suggest another book that you'll find interesting:

"Aerodynamics for Naval Aviators" by H.H. Hurt, Jr
NAVWEPS 00-80T-80
Naval Air Systems Command
United States Navy

There are a number of reprints; the one I have was
made by ASA, ISBN 1-56027-140-X (sold on Amazon or
your local pilot shop).

--Sylvain
thanks for reference, but I need to determine their quickly and i have
not enought time to bye this book (too long to order and to receive it,
i'm in Luxembourg)