Earthstar Forums

Wow 80/1 is sure a lean mix. I wonder how the crank bearings get enough lubrication. They must duct more
fuel mix through them than rotaxes.
Hirth is on to something with the Al-Nikasil cylinders. I think rotax did the same thing on their 912s.
I agree with your thoughts that many problems are probably operator error. I follow rotax forums as well and some people still can't get them to run right.

Mike S

Hi mix ratio is related to oil quality. If you have a 100 to 1 mix oil and you run it at only 80 to 1, you will ruin your engine in time because the active elements like Molybdenum are present in larger percentages so as the total amount of oil is reduced to 100 to one it still has enough of its active elements, to much of any good thing is damaging.
Deposits can build up and stick the rings, causing blow by and erosion of cylinder wall.
Happy Flying
Mark
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It's true I'm running 100/1 oil but with the fuel injection it was suggested a premix of 88/1. That's not a lot of oil, I will take the chances with a little xtra compared to not enough !

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This oil lubricated theme sounds rougher by the days. even large refrigerator compressors are oil less + silent these days.

I will be very grateful for a list of common operator errors with these engines. oil seems to be the top one. (goes without saying, i got to pore over a couple of ic engine forums's messages over the years to understand the essence of the problems, one of these days)

Some go with nikasil coated cylinders, DLC coated pistons and PVD (physical vapor deposition) coated piston rings. even multiblade razors come with DLC coatings, so it can't be that expensive, but there is some deeper analysis there to grasp on what coating goes where for the best results..

Thanks in advance,
Rahul

Does anyone make a small, fuel injected 4 stroke with dual everything, that is light enough to keep a soaring gull within the 103 weight limit? I would still like to figure out a way to build a 103 legal Odyssey.

Try this group
https://groups.yahoo.com/neo/groups/Sma ... gines/info

Hi
The exemption to FAR 103 that allowed the Odyssey to be flown for training. Was revoked. 2 seaters now have to be flown by light-sport or higher pilots and the planes have to be registered.
So you can not do a Odyssey as an ultralight.
As for the ultralight engine, do a google search for eGull.
Happy Flying
Mark Beierle, Earthstar Aircraft

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I was thinking of making it a single seater,and reducing weight and fuel capacity to bring it under 103 (basically making it kind of a thundergull JXL, lol), if that is even possible

---In Earthstar_Aircraft@yahoogroups.com, <thundergul@...> wrote :

Hi
The exemption to FAR 103 that allowed the Odyssey to be flown for training. Was revoked. 2 seaters now have to be flown by light-sport or higher pilots and the planes have to be registered.
So you can not do a Odyssey as an ultralight.
As for the ultralight engine, do a google search for eGull.
Happy Flying
Mark Beierle, Earthstar Aircraft

Sent from my iPhone

An Odyssey as a single seater?? Why knot just a Gull 2000, as it has way more elbow room than the JT or JT2. As far as the skinniest 4-stroke 4 cylinder, the “D” motor looks interesting, but it’s about $17K. I’m staying with the 503 until I get rich or my money boat comes in, then it will be all electric.

It will depend on the accuracy of your scales.

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