New Prop

[Larry Carnahan]

I went to Michigan Wheel’s website because I was disappointed my 17’ center console boat with a 100 hp Johnson OB would not stay on plane under 4000 rpm. I entered my stats and they made a propeller recommendation. I went from a 15-1/4 x 15 3 blade aluminum prop to a 14-1/2 x 17 3 blade Rapture and got these results:<br />I can throttle down to 3500 rpm and stay on plane<br />WOT was 5800 rpm, now 5400 rpm<br />4000 rpm was 19 mph, now 24 mph <br />4500 rpm was 24 mph, now 31 mph<br />5000 rpm was 31 mph, now 37 mph<br />WOT was 35 mph, now 40 mph<br />I expected some change, but not this much. Wow.<br />BTW - I ordered the prop from the Marine MegaMall on Monday and UPS delivered it on Wednesday. Wow again.

 

[quantumleap]

Re: New Prop

Looks like you picked the right one! BTW, is your new prop the new two pices rapture with the replacable hub sleeve like a merc prop?

 

[Jdeagro]

Re: New Prop

What is your minimum speed to stay on plane?<br />What happened to your hole shot?<br />Does the boat porpoise?

 

[Larry Carnahan]

Re: New Prop

The new prop is the Rapture with the replaceable hub sleeve. I didn't check speed for staying on plane - I'm guessing it's around 15 - 18 mph. Hole shot actually improved. Planes in about 2/3 the time as for the old prop. No porpoising with correct trim adjustment - that seemed to be the same as for the old prop.