Small L+R props

[Simon.O.]

The basic plan is to repower my small hydro with twin Mystery outrunners as an experimental hull then do a build off that.

Given a pair of small outrunners 28mm dia and 30 odd mm long, can I spin 31mm props ?

I am looking for a few options here.
I can do the Graupner CF 31mm L+R but with a 4mm threaded shaft

I can do Octura metal 430 L+R on a 1/8 shaft

Are there other options??

Remember I can do any shaft size and thread, I would like to be able to try different props if at all possible.

This may get interesting.

[ED66677]

be carefull Simon when usin conterrotating CF prop, I tink the K31 L have left M4 thread!!!