On 1/22/2015 2:59 PM, Jiro via KRnet wrote:
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> Yamaha Genesis Snowmobile engine:
>
> Rotary Forum has had extensive discussions of and by folks
> who have adapted the Yamaha Genesis 3 or 4 cylinder snowmobile engines for use
> in gyros. The links below are to the latest and apparently more available
> adapter called ?Skytrax?by it's creator Neal Jenkings. This
> allows a Rotax C box to bolt up to the 4 cylinder RX-1 years 2003-5 The cost
> is
> $1500 for the adapter and then the C Box needs some machining (which the
> fabricator will do for shipping costs). Neal is using carburetors on his
> autogyro.
>
> Here is one of the most recent Rotary Forum discussions
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> http://www.rotaryforum.com/forum/showthread.php?t=37557&page=5
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> Here is his you tube video of how to bolt up the conversion
> adapter and the C box.
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> https://www.youtube.com/watch?v=r8UXxcV1CFQ
>
> There are several threads on the Rotary Forum. I have read
> some of them and will summarize. The 3 cylinder is much harder to adapt, spins
> slower about 8700 rpm and makes 120 hp carbs, 130 hp EFI. There are various
> adaptions of the 3 cylinder, but it seems to be on a custom basis.
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> The 4 cylinder RX-1 revs to 10,700rpm and makes up to 150 hp
> is the R1 motorcycle engine adapted to snowmobile use with a CVT. This
> required
> an internal reduction of 1:1.19 and a harmonic balancer. The cover for the
> balancer and
> reduction Skytrax replaces allowing the C box to bolt to the engine. Another
> fabricator designed and marketed a two piece plate that can be adapted to any
> gearbox. I believe this costs $1300. I am not sure of availability.
>
> These are used snowmobile engines which cost $2000-$4500.
> There is debate on the suitability of the C box for the RX-1 given it?s 150
> peak hp and high rpm. The weight of the RX-1 FWF (or FW rearward) seems to be
> about 165-170 lbs including fluids, radiator and everything else. There are
> few
> hundred hours on the Genesis engines aero converted. I don?t recall I think
> the
> 3 cylinder engines had more air time.
>
> Motus
>
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> VikingAircraft lists the Viking 135 for about $20,000. This
> is the Motus aero conversion. There is very little info on their site
>
> http://www.shop.vikingaircraftengines.com/Viking-Engines_c15.htm
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If this is going to be a forum for buy/selling Viking engines, I need
tag this as junk mail so it goes to the appropriate folder.
