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Rotary in a boat

Old 07-09-03, 11:25 AM
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8/1 Building/Drive Ratio

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Rotary in a boat

the boat would be a donzi classic 18

Im thinking

twin turbo 20b air/water intercoolers, larger turbos

I would probably go with a racing style or duoprop setup

running a sustained 6k full boost cruising speed.

My questio are.

can a rotary handle this. Piston engines do it I cant imaging why a rotary couldnt

how would I go about mounting the engine to the stearndrive. Ill probably have to have a bellhousing made.
Old 07-09-03, 06:33 PM
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whew..... I dunno about full boost at cruising, but they can definatly take a beating when cooled properly. As far as mounting goes.... couldn't tell ya, I know jack **** about boats.
Old 07-09-03, 07:51 PM
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Open up! Search Warrant!

 
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www.atkinsrotary.com

They make rotary engines for planes and boats
Old 07-10-03, 07:46 PM
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If you are using a stern drive make sure it can handle the HP of a 20B and the rpms you will see. A boat engine needs a lot of TQ not so much HP. Remember that.. A 6k crusin speed is prob 3.5k above what that boat stock crusises at.
Old 07-12-03, 12:44 PM
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8/1 Building/Drive Ratio

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My donzi right now does about 63mph at 5000 rpms.

I have seen people push as high as 6500 with built motors.

Im thinking a mercruiser BRAVO2 duo prop setup.(two propellers inline, counter-rotating)
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