Request for Info on the P-39

[Buzzbait]

S!

Wondering if anyone has information on the following regards various models of the P-39:

Zero Lift Drag Coefficient

Lift Coefficient

Comparative data with other U.S./British and German aircraft would also be useful.

I have come across some information which suggested the P-39 had one of the most slippery profiles of any U.S. aircraft other than the P-51.


                                        Any help appreciated

[wells]

Buzzbait,

The pilot manual for the N/Q gives a stall of 105 mph clean and the plane weighs about 7570 lbs, so your lift coefficient works out to be around 1.26.  As for drag, the plane hits 376 mph @ 12700 ft or so with ~ 1450 hp output (with ram).  Assuming 20% losses to the prop efficiency, you're looking at a Cd0 of about 0.021 for a wing area of 213.2 sq ft.  If you wanna analyze the airfoils, it used NACA 0015 at the root and NACA 23009 at the tip.

Check out the book, "America's Hundred Thousand" by Francis Dean (ISBN 0-7643-0072-5)