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Author Topic:   Prop selection for 15' 3" sport
scattcat posted 06-18-2001 01:23 PM ET (US)   Profile for scattcat   Send Email to scattcat  
Have a 1979 15' 3" boston whaler sport w/ 1979 johnson 70 hp prop is a 13x19 omc s/s engine turns 5300-5400 rpm at wot with a medium load in the boat have engine set on a high jacker jack plate with 5 1/2 inch setback and raised as high as i can go before prop blows out and still have 20+ psi water pressure. I get about 43 mph top end and a good hole shot. question is wouldthe stilleto 13.25 x19 s/s performance prop give me any performance gains over to omc s/s prop, and what would they be thanks for all responses.
Bigshot posted 06-18-2001 03:19 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You redline at 5500 so you are propped right. The 79 is rated different that 84 and up so you are roughly 60+ hp with the wear & tear(sorry). If you were to step up to a ss prop(I only run SS) I would get the 13x18. If you wind up turning over 5500(doubt it) you can have it cupped$10 and that will drop you down a hunred or so. The ss should give you 2-4mph better. My 15 center console with a 1990 70 had a 13x19 double cupped and jacked on the transom. It ran the best speed @ 46.7 on the gps @ 5900 rpm's. My 70 was also pushing about 75 hp.
scattcat posted 06-19-2001 06:22 PM ET (US)     Profile for scattcat  Send Email to scattcat     
thanks for info...

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