Hello,
This has to be one of the hopeless Curtiss attempts to improve the P-40 and update it. Curtiss tried and tried to make the P-40 into an updated warplane on a par with the P-51 and others, but without success. Incidentally, pleeeeese don't anyone say that the P-51 was developed from the P-40, it wasn't as any aircraft designer or aerodynamicist will tell you.
Best wishes,
PV Chairman.