2003 Trophy 2302 wrong propeller?

[porscheguy]

Have you checked the mounting position of the outboard itself? This can be a big factor, especially if it’s too high or too low.

 

[dingbat]

I went out over the weekend, removed the hydrofoil. The waves were almost flat, got 32-33 @5300 WOT. i gained about
3-4 more mph, still not hitting 5800 rpm. saw some youtube videos about prop. in order to get my rpm up, don't i have to lower my pitch to 15X13 P ? I thought they says the higher the pitch the lower the rpm, as of today, 15 3/4 X 15 P 32-33 mph @ 5300 rpm WOT with 3 on board.

Roughly 500 rpm for very 1” change in diameter.

Going to a 15x15 prop should add roughly 375 rpm. A 15 x13 would add roughly 550 rpm

Still leary of the whole thing . The 15-3/4 x 15 seems to be the OEM prop selection

 

[tobqluu]

I don't wanna mess with the mounting position, I'll take a looks but it doesn't look like anybody had moved it.

I thought they (youtube) says pitch changes your rpm? I think the best way to test would be for me to go alone on a calm day. I saw a few posts from other people with the same boat size and engine getting 38mph max, so I don't think I am that far off.

 

[firstgun]

i have the exact same boat and motor even hardtop.my performance figures are same with the15-3/4 x 15 mirage.i also was looking for more rpm.since 5800 is max .i would like to know if you have made any propeller changes and their results. i know slippage is a factor but i think an improvement can be achieved. thanks.

 

[Texasmark]

I checked all the cylinders when i bought the boat....
they're all 120-125 psi on all 6.

if i have one cylinder out, wouldnt it backfire or shakes at idles? my idles are smooth. Loaded with 3-4 persons onboard.


I did installed a outboard hydrofoils on the motor, don't know if that slow it down or not.

Take your whale tale off and run it. May surprise you. Whale tales were made for 20-25 mile WOT operation! (opinion)