Let's see, can't really help without knowing what you're trying to use as a controller, but...
- and = keys are throttle
Number pad - and + keys are Prop RPM, and will not make you "go".
None of those keys will work if you have throttle and RPM functions mapped to a controller axis.
Unless you have a controller with multiple throttles, your throttle axis
must be mapped to
Analog Inputs Throttle 1 or you will have no throttle control.
Also see
Controller setup guideor
Using mouse as a controller if you don't have a joystick.