Rotax-582 mounted vertical?


Living in the Skies
Nov 24, 2003
Kronshtadt, Russia
none own :( currently flying Calidus mostly
Total Flight Time
Don't know exactly, ca. 3000 hours
I was recently asked by local homebuilder who wants to install a R582 in his ultralight helicopter design. The question is if there are any troubles expected/guaranteed if he installs this engine (without gearbox) with crankshaft vertical? Surfing the Net gave nothing to the moment. The only thing I found is a Lonestar helicopter designed by late Ken Rehler many years ago. It has R582 installed that way (crankshaft vertical) though later videos show this helo powered by another engine.

I'll be glad if somebody can add some knowledge about mounting R582 vertically. Local Rotax dealer (they have really excellent engineer) couldn't tell anything besides the suspicion that front (upper for this case) crankshaft bearing can get not enough lubrication in such setup.

Any comments are greatly appreciated.

And well, if we speak R582 - couple more questions about it:

- is there any experience in turbocharging this engine?
- are there any means for altitude compensation for these engines?

Thanks in advance,


C. Beaty

Gold Supporter
Apr 16, 2004
Rotax 2-stroke engines have troughs under transfer passages that catch oil condensation and have drilled passages that feed it to main bearings. Maybe main bearings get enough lubrication from exposure to the fuel-air mix; maybe not.

Also, 2-stroke engines designed for vertical crankshaft operation such as outboard boat engines have serrations on the connecting rod big ends to wedge an oil film between big ends and crank cheeks. Rotax 2-stroke aircraft engines do not.

Supercharging a port scavenged 2-stroke is iffy, much depends upon the design of the tuned exhaust system; normally forcing more fuel-air mixture into the cylinder simply blows more fuel-air mixture out of the exhaust ports.

Large 2-stroke diesel engines such as those by GM Electromotive that powered many US railway locomotives always had scavenging by forced air and benefited from supercharging because they had separate exhaust valves that closed while transfer ports were still open.


Junior Member
Aug 2, 2010
Cartersville, GA
Owned Brantly B-2b/Fly Kitfox III/Mini-500b
Total Flight Time
The Rotax 600 E-Tec has direct electronic oil squirt which sprays oil with pinpoint accuracy, directly where its needed.
It uses a tiny amount of oil and don't smoke. I bet it could be used vertically.