Hello there. I'm a new member, and a tinkerer in my spare time. However, I have no real prior experiance in aircrafts, and I had a neat thought recently: I want to set up a push prop powered by a 4-stroke engine on a mini-bike frame. The problem is I don't know how to figure for the thrust I'll need. I've found some formulas, but none that meet my needs. Because the bike won't be leaving the ground, I don't need to worry about lift or other aspects of flight, just thrust. Any advice? P.S. Sorry if there's a more suitable thread for this, I saw this and thought it the most appropriate.