Thanks so much for the great input gentlemen
..... my poor head is swimming as to what to do. Ok, lets give you an update on what I have done so far. I added some rubber packing under the bottom of the motor and under the metal strap. The motor needs to go "down" in order to get better alinement with the shaft I have now. By tightening the strap down with that packing, it did force the motor down and she does run a bit smoother, so I know I'm getting better alinement. The problem is now on the other end of the shaft, where the prop is. The prop has no set screw, so I have to snug the outer nut in order to get enough friction for the prop to spin. Actually, the nut wants to thread itself off the shaft.. not good. The end of the shaft is threaded and the prop does lightly thread itself onto the shaft, which helps. The prop is not brass, its pot metal cast. Came with the kit. The prop has a shaft ID of 4mm, same as the shaft. The motor shaft is 3mm. So, I had to get a coupling that was a 3mm/4mm. The prop is 35mm dia. and is very shallow pitched. I think the motor is spinning that prop counter clockwise.. so does that make it a left hand pitch prop? I want to replace it with a proper 4 bladed brass prop, maybe 50mm. The appeture will easily handle that size prop. My transmitter is a pistol type, so the trigger is the throttle, if I am easy on the finger pressure, I can really slow the spin down. On a new prop, do they have set screws, or do I have to tighten with a washer and nut? Or, if the fit is tight enough, I can force thread the prop to the shaft and that will help. Am I making any sense? I'm really sorry for bugging you folks with this, but I am really brain dead, but I'm learning. Yes, I can get a short shaft to make an extension, move the motor back on its wood support rails, add another coupling of the same as what I am using now, to help achieve better alignment, was hoping not to have to do that. The motor I have is a 550 Titan 12T (better suited for electric cars)... its probably not the best match for what I am trying to do. It didn't break the bank, so I'm will to give it a try in order to get out on the water and replace it later, or maybe I'm being foolish here and should go ahead and replace it with a better match?
Dennis