Bill,
Other than the motor mount and coupler the rest of the hardware would match what a .21 sport Hydro uses. 3/16 (.187) cable for sure in anything above P/ltd. I think I gained maybe 1/2mph going to a .150 cable in my Cat and it broke adding a larger motor which you will do in your whip eventually. Look at mounts on OSE and their 5mm to .187 couple has held up for me with some larger Q boats. Never slipped. The WP servo on OSE is very strong and reasonable.
Mic
Mic Halbrehder
IMPBA 8656
NAMBA 1414
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