For my Physics 2 class, we were asked to create a self propelled gondola that would traverse a 3/16” total diameter rubber insulated wire across a 70’ span approximately 20’ above the ground. Below is a link to my website with further information, schematics, and pictures of the project. http://web.mac.com/ddrueckhammer/iWeb/Site/Mono Wire Racer Project.html I have designed an aluminum enclosure and wired my batteries so that my motor is at max capacity. (18 V, 2.4 A, 18000 RPM w/ load). I haven't weighed it yet but I think my total weight is under 1 pound. Unfortunately, I am restricted to Alkaline batteries so the weight can't be cut significantly without cutting power to the motor. I am getting a propeller adaptor so that my 2mm shaft can fit bigger props. My questions are: Can anyone recommend an RC Airplane or Hobbyist forum where I can get some help? Would I benefit from using a front mounted gear-box on my motor? I think that this would cut the RPMs but add more torque. What are the benefits in general for gear-boxes? What sort of prop should I be using? From the little research I have done, it looks like a 7-9 inch pusher prop would be good but I'm not sure whether a flat pitch or a deeper pitch is appropriate. Also, would I benefit from using a 3 or 4 blade prop? My max lwh is 25cm x 15 cm x 25 cm and my max wight is 2.2 lbs. I am limited to a max of 2 motors and only ones available through Radio Shack. And my max voltage is 18 V from Alkaline batteries.