I don't think there is one. The well-established user test for ethanol before fueling a plane is to fill a test tube part way with water and make a mark. Then fill it the rest of the way with gasoline (which will float on top) and shake it. If the line has moved up, there's ethanol in the gasoline and it shouldn't be used. I've never seen this test suggesting that it's OK for the line to move up just a little bit, etc.
Of course, this is the test for certified planes that use STCs for autogas. Ethanol gas is very corrosive, and modern cars use polyethylene gas tanks and other parts that aren't affected by it. But if you have an experimental plane with an auto engine and you use ethanol-resistant parts for everything, you could probably use the same gas you'd use in a car. Mike Taglieri On Tue, Sep 11, 2018 at 5:22 PM, Craig Williams via KRnet < email@example.com> wrote: > I have a question in this same vein. If I mix 50/50 of 100LL and a 93 > octane autogas with 10% ethanol don't I end up with something like 95-ish > octane with 5% ethanol? At what point can I ignore the ethanol. 6%, 4% > maybe 3%? > > Craig > > > > > On September 11, 2018 at 10:25 AM "brian.kraut--- via KRnet" < > firstname.lastname@example.org> wrote: > > > > > > Earlier in this thread there was talk of mixing ethanol containing mogas > > with water to remove the ethanol. That does remove the ethanol from the > > fuel (not sure if it removes 100%, but it does remove a lot of it), but > > there is still one problem. From what I have researched, the ethanol > > they normally use is 113 octane. If you remove the ethanol from 87 > > octane mogas you are left with 85 octane. Not sure if there are other > > considerations, but I would not be doing science experiments with the > > gas I am using in my airplane if I was not some kind of expert in fuels > > and knew exactly what I was doing. > > > > Brian Kraut > > 904-536-1780 > > br...@eamanuacturing.com > > > > _______________________________________________ > > Search the KRnet Archives at https://www.mail-archive.com/ > email@example.com/. > > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to > change options. > > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org > > _______________________________________________ > Search the KRnet Archives at https://www.mail-archive.com/ > firstname.lastname@example.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org > _______________________________________________ Search the KRnet Archives at https://email@example.com/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org