On 26cc Quickdraw powered riggers we run 2170 and 2175 props modified by Andy Brown. On 26cc sport hydros the 6717 modified for your application by Bob Austin works very well.
Lohring Miller
Lohring:
I have designed and am finishing up building a couple gas riggers. They will be Quick Draw powered. Boats will be light. What kind of props should we use initially for heat racing. Seems that there is a REALLY limited supply of props with adequate pitch/diameter. How much pitch can be put into the props that you are running and still be efficient?
Marty Davis