engines will not rev up for take off power

[redxfred]

First, double check with Windows' Control panel that that the computer is getting full throttle deflection. If so, the game is the problem. It sounds like your throttle works OK.

Make sure that the Prop control is set to fine pitch. (Knob full forward)

While mixture does not work reliably in CLoD, Make sure the knob is in the full rich position.

Other things that are easy to overlook on takeoff, yet do not retard engine RPMs, are the wheel brakes and the radiator position.

Apply and release the brakes just before throttle application. This will assure that the parking brake is released.

Make sure the radiator lever position is not overheating your motor if you have to sit on the ground for a while... select temperature effects OFF in the realism menu. If you don't, be sure the radiator is full open.