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It's pretty much the same boat from what I understand? A 21p with a 280hp engine? you must be turning close to 6,000rpm I would guess, from what I have been reading. My goal is to turn this prop at about 5100.....I figure it'll save a bit on gas, still have a great hole shot, and by keeping the rev's down a bit save the powerhead from some wear.....well, that my theory anyhow!
Thanks all for the replies. I am running a generic 19 3 blade SS now, so by my calculations, if I am running at 6,00 and the suggested WOT is 5,500 for the motor, I need to knock the RPM's down (and 5,100 isn't exactly lugging it). SO add another blade to the three blade prop is a -250 rpm, add two inches in pitch -150 rpm for each inch.
My math works out to be current RPM of 6,000 -(250+150+150) = 5,450rpm with a Trophy+ 21p?
Am I all wet , or is this correct?
Well, unfortunately, the motor is spec'd for 5600 rev limit, so if I run it to 5700 or 6000 as you suggest, I am a little concerned.....