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#11
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Re: Sizing your prop
If you compare the performance tests of a large number of outboard powered boats you will find that best fuel economy is almost always @4000rpm (cruising) or 1000rpm (trolling). 3000rpm is most often the worst for fuel economy. This all is effected by the fact that most boats are struggling to be on a plane @3000rpm and not in the engines designed power band.
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#13
06-06-2006, 12:06 AM
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Re: Sizing your prop
I know as a rule of thumb your RPMs won't be as high as a 2cycle outboard +- 5000 to 6000....I think you should be somewhere around 42-4500 MAX, but you can't quote me on that
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#14
06-06-2006, 08:51 AM
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Re: Sizing your prop
Sounds about right phester.
__________________
Heavily medicated for your protection.
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#16
06-06-2006, 01:18 PM
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Re: Sizing your prop
Rev, didja ever find out the max RPMS for your motor?...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#18
06-06-2006, 03:46 PM
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Re: Sizing your prop
__________________
bogey-free in E Greenwich RI on a 79 v-20 165 hp I/O
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#19
06-06-2006, 03:56 PM
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Re: Sizing your prop
And w/ a light load, good conditions, trimmed up, etc, will she turn those numbers w/ that prop?...if you can try a Merc Mirage in that size, I think you'l keep it...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha
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#20
06-06-2006, 04:21 PM
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Re: Sizing your prop
I'm not sure of WOT rpm's but I know I'm over 4000.
I'm a little gun shy of full throttle but next time I'm out I'll check it out.
__________________
bogey-free in E Greenwich RI on a 79 v-20 165 hp I/O
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