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Old 12 January 2018, 15:39   #11
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1 inch of pitch is usually 300-400rpm I've always read.

I would be inclined to run your prop and get in writing a prop to follow once you test your own.

A day at the big puddle will have you at least over the initial 2 hour run in stage where you can go full throttle and get an idea.
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Old 12 January 2018, 16:25   #12
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Well I put the Merc 150 on the rib three years ago and matched it with merc's 19" Enertia prop. Must say as one who only cruises I find it spot on.
Me too,,, 17" Enertia Eco. 6m cobra with 4 fat boys and dive kit. It's still slightly over propped when fully loaded but very happy. Will dig out my fuel figures. Definitely 20% + improvement on my 2008 optimax 175.
The Enertia and Enertia Eco are different props btw
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Old 12 January 2018, 17:03   #13
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To be honest LT I'm not a great figures man. It at times top
Out at around 56-5700 with all figures as per Paul's post the Merc figs. But every trip is different sea, load tide wind so I really don't see the sense in getting all bothered I know my wallet is better of both fuel and maintenance. Hope it works for you. All
I can say is that I took merc's recommendation and over the piece it has worked. Cheers B
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Old 12 January 2018, 17:19   #14
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To be honest LT I'm not a great figures man. It at times top
Out at around 56-5700 with all figures as per Paul's post the Merc figs. But every trip is different sea, load tide wind so I really don't see the sense in getting all bothered I know my wallet is better of both fuel and maintenance. Hope it works for you. All
I can say is that I took merc's recommendation and over the piece it has worked. Cheers B
Considering what you took off I'm not surprised. Like pouring petrol over the side!

Btw the patch looks tidy. You sitting behind my boat just now.
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Old 12 January 2018, 18:07   #15
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Considering what you took off I'm not surprised. Like pouring petrol over the side!

Btw the patch looks tidy. You sitting behind my boat just now.


Cheers Paul yea she was thirsty old girl and noisy!!
Thanks for feedback re patch as I've been down with this bloody flu for four weeks and haven't managed up.
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