Hey guys. My 31 jupiter has twin 300’s with 16x23 wheels on it right now which i know is too big. The motors are also on the lowest mark on the armstrong bracket.
With about 175 gallons and only myself and one passenger I'm hitting 5250 rpms at 42 knots and approx. 60% trim at WOT.
The boat will usually have a 4 man crew with gear, ice, and 250-300 gallons of fuel for the long haul trips. I do not want to over stress the motors and it is definitely sluggish out of the hole.
So, should i go for 21.5’s or try even smaller?
thanks in advance, CJ

Thanks for the quick response. I figured they are too big. I haven’t had the chance to see the cavitation plate yet. My guess is that they can also come up a hole. I don’t want to worry about getting blow out in rough seas though. Do you think the 21.5 is still too big?

My 2004 Jupiter 31FS runs Verado 300’s (1:1.85 gearbox) on Rev4 20” props at 5900rpm. Boat is heavy with gear.

Thx for the info. My cruise right now loaded with 4 men at 4100rpm is 32-33 kts. Im pleased with those numbers for now. I wonder what rpms I would be at with 20’s to achieve the same cruise speed.

Thx, i will reach out. Those numbers sound dam good. I top out at 52 with a light load.

Yes right around 2.08 if my memory serves me correctly. I cruise at 32/33 kts around 4100.