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Hi there,

I've just purchased a 2005 outrage 240, and had a 2020 Verado 300 hung in place of the 2005 Verado 250 that was on the boat when I purchased it. I'm working on figuring out what prop to use to provide me the fastest cruising speed (speed between 4800 - 5200 rpm) on this setup and have tried the following:

Mirage 15 3/4 x 15 - poorest performance - tapped out at 37mph wot (5950 rpm), 32mph at 5000rpm

Enertia 14 x 19 - tapped out at 41mph wot (5650rpm) 36mph at 5000rpm

Enertia 14.7 x 16 - tapped out at 39mph wot (6000) 34mph at 5000rpm

Looking at whalers test with twin 150's it seems they're hitting 48mph wot, which I'm not close to. Wondering if anyone has any prop advice? Also, I think the shop may have hung the engine too high. Does anyone have advice for distance from keel to cav plate on this setup? Many thanks in advance.

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I would think you would be in the mid 40s at least. Does the motor blow out when you trim it out? What hole is it mounted on?

I would try a 15.25" d 19" pitch Mirage II on that boat too. Twin 150 in theory should be a tad slower than a single 300 Verado.

I would think it is mounted to low and is dragging the cavitation plate below the water.

I would stay with 15 diameter props and stay away from the 14" ones. That motor and boat need the big prop or you will have a lot of slip.
Archie