Yamaha RX-1 Snowmobile Engine Conversion

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AIRCAB

Well-Known Member
Joined
Feb 6, 2015
Messages
68
Location
Vancouver Island
Marc, I do see that image, for the prototype RX1. I believe he now has moved away from that, and is producing a PSRU for the Apex model. This new PSRU uses a Spragg clutch. Am I wrong ?
 

Marc W

Well-Known Member
Joined
Mar 31, 2017
Messages
420
Location
Colorado
I believe you are correct. The Apex does still have the internal rubber damper on the output shaft.

There is an awareness in the Yamaha community that these engine/redrive setups are not proven. In fact, when somebody shows up on the Facebook site wanting to put one in some super whiz-bang model like a BD-5, they are usually told that the engine is unproven in aircraft and should be installed in an airplane that is capable of making an off airport landing. However, so far the engine/redrive combination has a good record. Time will tell!
 

Patrick Wehling

New Member
Joined
Apr 2, 2020
Messages
2
To Marc W: In your post of Feb 19,2020 you attached cover to aluminum plate that was chucked up in lathe chuck. You then got a better centering by using chuck jaws ( 4 jaws I guess). I am guessing that the chuck jaws secured the plate in a hole that you drilled in the plate that was roughly concentric with the cover hole. Does that sound right. Thankyou
 

Marc W

Well-Known Member
Joined
Mar 31, 2017
Messages
420
Location
Colorado
The plate has a block screwed to the back side. It must have been a jig or fixture in a machine shop. The other side is chewed up and full of holes. I don't remember where I got it. It's been in the scrap pile for years. I trimmed the plate to fit the swing of the lathe and clamped the block in the 4 jaw. This is why I never throw anything away! A man's wealth is measured by the quantity and quality of his junk!

I hope that answers your question.
 
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