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Rank: Member
Groups: Member
Joined: 5/20/2008
Posts: 10
Points: 30
Location: Key Largo, FL
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Ken,
Going from a Yamaha black steel 13.25 x 17 to a Mirage plus 15.5 x 17. getting 5400 rpm and 44 mph on 150 hpdi with yamaha prop. What should I expect from the Mirage... have not run it yet.
Thx
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Rank: Administration
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Joined: 2/27/2007
Posts: 1,784
Points: 5,065
Location: Sarasota
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your slip ratio with the Black steel prop is 5% which is very low. (good)
If you put the larger diameter Mirage on there, I think you'll loose speed and it will drop you about 300 rpm.
If you were slipping a lot, the Mirage would probably help a good bit, but since your not slipping, it may just create more drag.
But its always worth a try. Let us know what happens.
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Rank: Member
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Joined: 5/20/2008
Posts: 10
Points: 30
Location: Key Largo, FL
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Ken...just tested Mirage and I got 5300 rpm and 43.3 MPH (GPS) on best run. Lost under 1 mph and 100 rpm. My mid range speed was better by about 2 MPH...hole shot did not change much. Load was a bit light. Do you think?
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Rank: Administration
Groups: Member
Joined: 2/27/2007
Posts: 1,784
Points: 5,065
Location: Sarasota
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I'm suprised you got 5300 rpm, I thought it would have held you down a bit more.
Still don't think its worth the swap really. The Enertia might be worth a shot, but you still won't gain much, just 1 or 2 mph at best.
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