doesn't matter it ain't close to correct - I have to guess a 17" pitch, on my 20 I kinda stumbled in a Stilletto prop and couldn't be happier. It produces incredibily low slip numbers and trim responce is outstanding. It will want to be mounted high on the transom, my cavatation plate is 2 1/2" above the hull bottom but worked much better after I raised it another hole. Yamaha bought the company a few years ago and it is the same as a Trophy, they are reseaonably priced around 300 new.
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Any way you measure it - dumbass is expensive
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