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Old 04 February 2009, 11:35   #1
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Wackel/Rotary engine powered RIB or SIB?

With such a big group of Ribbers and Sibbers here, has anyone tried or know of any one who tried a rotary powerplant for their boat? I talked to a guy who was going to try it last year in Michigan, USA at the APBA SLT races but never found out how he made out.
Any thoughts, questions, or anything on the subject?
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Old 04 February 2009, 11:49   #2
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Try a post here. You may just be lucky.
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Old 04 February 2009, 11:50   #3
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Used to own a Mazda RX-7, which used the 13A engine (I think it was. smaller of the offered engines, with the 13B being the larger.)

The Wankel engine is light (for the output), simple (reliable, since they went to the nitrided rotors and chambers), and loves to spin, but it is extremely fuel inefficient. For racing applications, it probably would be a good candidate, but for a leisure boat, I'd think there would be better choices.

There were a couple of airplanes (as I recall) that were trying to use the Wankel design as a powerplant, but I don't recall the engine taking the industry by storm (i.e. Never heard about them again. Of course, I wasn't really paying attention, either.)

jky
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Old 04 February 2009, 12:49   #4
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Quote:
Originally Posted by audiobill5 View Post
With such a big group of Ribbers and Sibbers here, has anyone tried or know of any one who tried a rotary powerplant for their boat? I talked to a guy who was going to try it last year in Michigan, USA at the APBA SLT races but never found out how he made out.
Any thoughts, questions, or anything on the subject?
Here's a couple of applications





I think the issue with them in boats is torque or lack of... low down..
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Old 04 February 2009, 13:28   #5
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Since a rotary engine gives all it's horsepower just off idle (linier power curve) I bet a 3 or 4 to one reduction or a multi-gear tranny would make it get instantly out-of-the-hole!
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Old 04 February 2009, 15:53   #6
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Wankels aren't new on boats. There were a few Wankel outboards around in the 60s and 70s.

http://sports.webshots.com/photo/284...91848696cXOHsZ

http://www.oddjobmotors.com/mac10wankel.htm


1) OMC, (Evinrude/Johnson), built a handful of massive 4 rotor engines that were used by their outboard racing team in the early 1970's and then retired.

2) The April 1973 edition of the OUTBOARDER, magazine of the AOMCI, indicates that Yanmar (the inboard engine & tractor folks) made an approximately 20hp Wankel, however I do not know of anybody who has seen or used one.

3) The third and most numerous example of a Wankel powered outboard motor is the MAC-10.




Norton also did a racing motorbike with a Wankel that one the Isle of Man a few times in the late 90s I think.
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Old 04 February 2009, 19:07   #7
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Wow, so cool!
It sounds like that rotary had LOTS of 'seat of your pants torque'!
Any idea of the gear ratio they would have run?
Great links, thanks very much!!
Bill.
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Old 05 February 2009, 08:43   #8
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There was/is a company in the States selling marinising parts for the Mazda motors - you would have to get used to those RPM's though - it sounds like it's going to blow all the time if you're used to a V8!
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When a boat looks that good who needs tubes!!!
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Old 05 February 2009, 10:37   #9
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The Norton engine was actually a development of a military target drone engine they built.

Suzuki also built a Wankel engined bike-the RE-5. Hideous, underpowered and overweight with the same brakes as the T500 (they came with a sticker warning that they didn't work in the wet!)



It'd be interesting to know what exhaust system the US company used on the marinised Mazda engine-from memory the RX7 ran like a bag of poo with anything other than the standard exhaust on it.
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Old 05 February 2009, 10:44   #10
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Originally Posted by Cookee View Post
There was/is a company in the States selling marinising parts for the Mazda motors - you would have to get used to those RPM's though - it sounds like it's going to blow all the time if you're used to a V8!

Hmmmm Mazda rotary or V8, quick decision that would be
I never fitted a radio in my V8
Theres no nicer sound than rolling the windows down at the entrance to gibraltar tunnels slowing down to 30 ish then FLOORING IT
waaay better than a wasp in a crisp bag wanke engine
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