Throttle System Using Body Velocity

I have a issue, I don’t know how to make a body velocity push a part in a plane like behavior. I already have a throttle power variable working and all the parts are welded onto a main part where the body velocity is located. I want the body velocity to push the plane at the power of the throttle power variable and make it look like a plane is moving, for example acceleration when the throttle goes from 0 power to 30 power. Thanks for the help!