You would have a lot more info on it than me, but just doing a quick AI query got me some interesting solutions to the E10 storage issue.
https://chatgpt.com/share/693469dc-5fa8-8001-a1ba-cc832b28f233 On Sat, Dec 6, 2025 at 9:24 AM Adam Deem via KRnet <[email protected]> wrote: > Yes, rotax engines and factory built aircraft that are designed where the > entire fuel system is ethanol tolerant are fine to run on it because the > components are ok with the chemicals that are in it. They aslo need to be > tolerant of a little dissolved water content. Even then it doesn’t store > well and non-ethanol is better for infrequent use. > > Adam > > On Sat, Dec 6, 2025 at 12:11 PM Steve Loebs via KRnet < > [email protected]> wrote: > >> Doesn't Rotax have an approx 80% market share in the new light aircraft >> market? Don't Rotax owners use E10 91 AKI primarily (and fall back to 100LL >> for long cross country trips)? We know those planes have fuel systems built >> to handle E10. >> >> The new UL350i engines are designed for E10 87 AKI and are less expensive >> than Rotax 914UL and have full FADEC and EFI. >> >> Larry mentioned that many KR owners only fly about 50 hours a year. If >> one flies a lot, say 200 hours a year, then the math shows that the savings >> in fuel expense by saving $2-3 per gallon running E10-87 is so significant >> that a 100LL engine would need to be virtually free to breakeven! >> >> On Sat, Dec 6, 2025 at 8:33 AM Adam Deem via KRnet <[email protected]> >> wrote: >> >>> The problem with pump gas is that even with advertised free fuel one of >>> two issues can arise: >>> >>> 1. Even ethanol-free pump gas can have detergents and additives that can >>> have unexpected reactions with tank sealants and resins. >>> >>> 2. Many stations don’t have a separate manifold for ethanol-free so when >>> you select it you still get pumped a gallon or more of ethanol laden gas >>> before the manifold is cleared and the ethanol free is delivered to the >>> nozzle. >>> >>> Only use mogas from an airport or station where there is no chance of >>> mixing or contamination from other fuels. And even then test it with a >>> test jar. >>> >>> Adam >>> >>> >>> >>> On Sat, Dec 6, 2025 at 10:53 AM Richard Kaczmarek via KRnet < >>> [email protected]> wrote: >>> >>>> If you want to be able to run the actual car gas the tanks should have >>>> 2 to 3 coats of Rhino 9700. It is an epoxy but has a Novolac backbone which >>>> stops the effects of alcohol on epoxy. I have been using it for many years >>>> from my days of building Lancair's and the 2 KR2's I completed. Neat thing >>>> about 9700 is it is also a structural resin. It does enter B stage very >>>> quickly even on cool days. >>>> >>>> Richard Kaczmarek >>>> >>>> On Sat, Dec 6, 2025, 10:33 AM Joe Horton via KRnet < >>>> [email protected]> wrote: >>>> >>>>> Good Morning Folks, >>>>> I am sharing this story again as a warning to anyone with epoxy >>>>> tanks. >>>>> On the way back from the gathering in Tennessee I think in 2011, I >>>>> chased the cold front home all day with landing multiple times to wait for >>>>> it to move ahead of me. I ended up landing somewhere south of Harrisburg >>>>> PA. about 10 min after the FBO closed and they had no self serve. A local >>>>> took me to a sonoco and I got 5 gal of 93 oct. (ya know the NAS Car >>>>> racing >>>>> fuel) and put in the header tank with several galllons of 100LL that was >>>>> still in the tank. I flew for another 50 miles or so and had to call it >>>>> for >>>>> the night 50 miles from home. Left early the next morning and got home and >>>>> to work before 7 am. I think that I flew again on maybe Wednesday or >>>>> Thursday of the same week and noticed a bit of roughness in the engine >>>>> operation. My memory is a bit foggy on the details of why I started to >>>>> investigate but at somepoint that weekend I looked into the header tank >>>>> and >>>>> the erosion of the gel coat inside the tank was so evident. There was a >>>>> line exactly where the fuel level had been when I put the 5 gal of Sunoco >>>>> in. There were glass cloth fibers exposed. I drained and cut tank open and >>>>> repaired it, but started to wonder about the epoxy that had erroded off >>>>> the >>>>> inside. I tore down all the intake and aerocarb and found a coating of the >>>>> epoxy (vinyl ester) inside all the intake tubes and in the carb. I pulled >>>>> heads but it appeared that the epoxy that may have gotten to the cobustion >>>>> chamber burned with the fuel. What a mess. >>>>> This was the first time that N357CJ had seen auto fuel in the 6 >>>>> or 7 years of operations. >>>>> I did try it at an airport in South Caolina at a Corvair college with >>>>> non alcohol fuel and the engine ran so rough I drained it back out gave it >>>>> to a local and filled up with 100LL. The plane never saw any auto fuel >>>>> again. Mark L. has the plane now but to the best of my knowlege the wing >>>>> tanks are still fine and the header tank has another 14 years or so on it >>>>> Total of over 20 years now. >>>>> My current build has aluminum tanks in the wings so that should >>>>> not ever be an issue. The header tank was home built with just over 8 gal >>>>> capacity and has had fuel in it for nearly 4 years now. I do look in every >>>>> so often just for peace of mind. I for one will never take that risk again >>>>> for the sake of roughly $2 a gallon difference. >>>>> Like Larry always says "your results may vary" but I doubt it... >>>>> Joe Horton >>>>> Dr. Deans plane ready for inspection..N657CJ >>>>> >>>>> >>>>> >>>>> >>>>> ------------------------------ >>>>> *From: *Kayak <[email protected]> >>>>> *To: *KRnet <[email protected]> >>>>> *Cc: *Kayak <[email protected]> >>>>> *Date: *Thursday, 4 December 2025 9:55 PM EST >>>>> *Subject: *KRnet> ethanol - anyone running it >>>>> >>>>> is anyone here running ordinary e10 ethanol car gas? >>>>> >>>>> just throwing out the question because almost all cars (including old >>>>> ones) are running on it, so it should be possible to accommodate it in an >>>>> aircraft. another option is to have a tank with 100ll just for >>>>> cristical flight phases like takeoff and climbout, and run the much >>>>> cheaper >>>>> car gas off the other tank for the cruise phase... >>>>> >>>>> >>>>> >>>>> -- >>>>> KRnet mailing list >>>>> [email protected] >>>>> https://list.krnet.org/mailman/listinfo/krnet >>>>> >>>> -- >>>> KRnet mailing list >>>> [email protected] >>>> https://list.krnet.org/mailman/listinfo/krnet >>>> >>> -- >>> KRnet mailing list >>> [email protected] >>> https://list.krnet.org/mailman/listinfo/krnet >>> >> -- >> KRnet mailing list >> [email protected] >> https://list.krnet.org/mailman/listinfo/krnet >> > -- > KRnet mailing list > [email protected] > https://list.krnet.org/mailman/listinfo/krnet >
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