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11-30-2007 10:58 AM  9 years agoPost 1
fredd

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UK - London

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There is a 62cc Zenoah widely used in airplanes. Any views on the suitability for such an engine in a heli envirnment. The power would be appropriate for +20Kg heli with 6 main blades. My question really is if a larger Zenoah would be more or less prone to vibration than a RC230/260. Has anyone an opinion on this or experience with other larger Zenoahs like the Z38 or Z45. The obvious alternative is a turbine but this is the gasser forum...
Thanks

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11-30-2007 12:01 PM  9 years agoPost 2
copperclad

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NY

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hi
there is the 52CC Bergen twin , it's a two cyclinder boxer i believe , so that should be smoother , just tossing it in , dana
http://www.bergenrc.com/

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11-30-2007 12:03 PM  9 years agoPost 3
mcfast

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Quebec Quebec Canada

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The biger the motor the biger the vibration, if you are looking for a biger Zenoah should look at the Zenoah Twin!

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11-30-2007 02:36 PM  9 years agoPost 4
Coolrunnin

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Manchester U.K.

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Big singles do vibrate very strongly without all kinds of balancing shafts and other additions. Horizontally-opposed twin (or more!) is the way to go for smoothness at larger displacements.

I'm sure the Zenoah 80 twin was/is in the original airframe NRI use (though I can't remember the company who made it) which might give you some ideas. Also look at the DNHP Big 200 for a radial engined large airframe.

Personally, at 20Kg+ airframes I'd be looking at turbine over gassers. With two-stage engine you could also eliminate the clutch. It may even end up being lighter despite the fuel load too...

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11-30-2007 09:34 PM  9 years agoPost 5
erichevy

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Zevenhoven The Netherlands

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Fredd, I have this engine in a aerobatic plane and you can't let it idle normal because of it's vibrations.
If such an engine is "ty'd" to a rigid helicopter frame I now it would tear things quick.
So it is better to choose a multi cylinder engine.
I've seen the Robbe Bigscale Hughes 300C been powered by a OS 1.60 (26cc) twin 4 stroke nitro engine, and that runs soo sweet.(it is not even close to 20 kilogramms but it's the tought that count:0)
Eric.

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12-01-2007 02:15 PM  9 years agoPost 6
fredd

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UK - London

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OK, thanks to all for the information. I will change to a two stage turbine, Jetcat SPH5. Seems the more sensible (and expensive) route to take.

Frederic

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12-01-2007 03:16 PM  9 years agoPost 7
erichevy

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Zevenhoven The Netherlands

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Turbine

That's the best choice a man can make ..
I'am also becomming more and more interested in a Robbe Cuatro with a Wren turbine and second stage gearbox!!
I think that's the most ultimate way of powering these Heli's!

Eric.

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