RCV:
Well, I tried your suggestion of advancing the gear carrier clockwise. It did diminish the gear backlash a little but even at its furthers point spun clockwise I still have 2mm of travel at the tip of the 16" prop. My newer RCV has hardy any backlash on an 18" prop. The older vintage engine below has now ruined two carbs, two remote ignition wires and sheared a carb fuel nipple due to all this vibration. I hate to think what all this is doing to the rest of the models electronics and structure. You can see my attempt to field fix the high speed needle by adding a bit of silicone tubing. This is not a solution as the needle is wobbly only after only a run or two. Despite the fact that this engine sat in a box for a few years it was never used until this project and all these problems came with it right out of the box. Truly I do appreciate your prompt reply, however I am not at all pleased by having to deal with this situation, especially since this engine has only seen the sky for a first test flight in which the vibration actually sheared off the fuel carb nipple after three laps around the field and I had to dead stick my plane at the far end of the airfield. What do you suggest now?


Arruda:
Thank you for the compliments. I try. The header and down pipe you see on the Spit is something I have made myself. Although not completed yet it will be a scale exhaust complete with molded exhaust stacks. The material used is Aluminum for the header immediately exiting the engine and fiberglass cloth and slightly thinned out JB weld as the resin for the down pipe. The inside and out are coated with a high temp 1,2000 degree paint used for automotive headers to help insulate the resin and cloth further. It's an experiment of mine and it should have all been finished quite a while ago but, as you can see above...I have had other issues to deal with.