Aircraft powered airboat discussion.
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Postby 12PSI » Wed May 16, 2018 8:08 am

What are y'all turning your GSO's at? I have a 78" 6 blade excaliber set at 20 degrees which is about max, I can touch 4,000 RPM. Top end is very fresh by a reputable builder so I know it's right. Is this too high?

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Re: GSO540 RPM?

Postby SuprchgedPalmBeach » Wed May 16, 2018 8:26 am

You shouldnt be turning any more than 3600 rpm' need to add some pitch..
15' 6" Palm Beach Hull, GSO-480, 82" 3-Blade JX Series

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Re: GSO540 RPM?

Postby Dirtman » Wed May 16, 2018 5:01 pm

I had this conversation with a person who had ran several GSO540's and he said the sweet spot he always found was between 3550 and 3600 rpm
IO520 on a 12"6" Lazer with a 72" Q #20814
Build in progress: 14x7'9" JB w/ GSO540 &80" Razor

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