Excellent work by the OP! Thank you. *This* has been a very productive and informative thread. Easily one of the best I have seen on this board.



Questions:



1. Would a paper towel work as well as a piece of notebook paper? Seems like the Jet A should still leave behind an oily ring.



2. If I requested it, would a fueler drizzle a little fuel into a clear container for me? Maybe a 2-liter bottle with the bottom cut off. Or something fancier - whatever. Is there some rule requiring you/them to dispense only into fuel tanks or 'approved (red) containers'?



If you are able to run more experiments...



3. Does an unagitated mixture ever form a phase boundary if left to sit? (I think you said you're going to test this anyway)



4. What happens if the fuel mixture is well-agitated as it might be during high-rate fueling? I'm curious to what degree the Jet A is actually soluble in 100LL such that, after a few minutes of agitation as would be typical, it might not ever separate because one fuel dissolved in the other. To my thinking, they are both hydrocarbons and should be soluble or at least partially so in the time it takes to fuel an small airplane.



Comments on the smell test:



The vapor pressure of 100LL is so much higher than Jet A that even at 50-50 volume mix with Jet A at the surface I suspect 100LL would dominate the nostrils because it flashes to vapor so much quicker. Jet A still might be detectable if one knows its smell since it has a very distinctive smell.



General BS:



Most of us have been taught that we can detect misfueling by using color or some kind of phase boundary (which works well with water) or even smell.



Clearly color has been shown to be unreliable and this has been a big eye-opener for me and I intend to add the paper test to my checklist and possibly even have the fueler dispense a small amount of fuel into a clear container before putting it into my tanks.



Undetected misfueling is a frighteningly-plausible accident chain.



Thanks again for the excellent post.

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