Solid shaft coupler question

[Shooter]

I just finished fabbing up a motor mount and coupler out of aluminum. Of course after I finished (always the case), it dawned on me that this thing is completely rigid (i.e. no flex shaft, no give). Will this cause vibration issues? It is a very low speed application (return to shore only) and everything is dead nuts true as far as I can tell (components were glued in while connected).

[ED66677]

it's virtually impossible to have two rigid shaft in line, why don't you use two of these coupler and a short piece of flex between?

[befu]

There have been boats in the past that used this method, and vibration is an issue but it can be dealt with. I would try it first as you are saying it is a slower speed and not constant use.

If it is a vibration problem, do what I do. (if you have a lathe, otherwise find someone who does) Take the drive shaft, and cut it down shorter, about 3/4". Then center drill it .093 for about .3" deep. Glue a piece of .093 flex cable into it and connect that to the coupler. Works great!

That is what I do for my couplers in smaller boats or to get rid of Ujoints.

Brian

[Shooter]

Thanks Brian. Good info!