Thank you for the replies. This might be user error, but I want to be sure. I did take some screen shots. Sorry, I didn't have a chance to shrink the size so they are big. This first one shows the airship I am trying to build. This one uses the electric prop engines. Plenty of electrical charge but zero thrust. Am I missing something else? I have no fuel of any type on this ship, just plenty of electrical. This second screenshot shows the Firespitter "Stock" aircraft. Obviously, the fuel-driven prop. Same issue. Wheel brakes are off, it rolls forward like some craft do on the runway at about 1 m/s, but that's it. I tried the Alt-F2 debug, but the only error message/red text was related to "Wheelcollider requires an attached rigid body to function".