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Avgas Question

Discussion in 'General Topics' started by JaceTheAce, Oct 9, 2006.

  1. JaceTheAce Well-Known Member

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    If 100 and 100LL are mixed what color is the fuel?
    JaceTheAce, Oct 9, 2006
    #1

  2. Mariano Well-Known Member

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    Colorless
    Mariano, Oct 9, 2006
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  3. jetman New Member

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    Green+Blue= ?
    jetman, Oct 9, 2006
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  4. avdrummerboy New Member

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    Aviation fuels are manufactured so that if any two of them are combined (100+100LL; Jet-a with any avgas, ect.) they will become colorless.
    avdrummerboy, Oct 9, 2006
    #4

  5. USMCmech Well-Known Member

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    Empty,

    100 octane avgas hasn't been made for several years, neither has 80 octane.

    Next question.
    USMCmech, Oct 9, 2006
    #5

  6. JaceTheAce Well-Known Member

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    Well, it's a possible test question for Aircraft Systems class...

    I though I heard the professor say "Colorless" but I wasn't sure if I heard right. Green + Blue = Turquoise (correct?), but not in this case :D
    JaceTheAce, Oct 9, 2006
    #6

  7. clumpinglitter Well-Known Member

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    I talked to a guy once whose engine was being rebuilt. It was destroyed after he flew it with a mix of 100LL and Jet-A -- the line guys made a mistake when they fueled it. He said that he did test the fuel before flying, but it was blue like any 100LL. He also said that there are fuel samplers available that have a float ball in them, and those can detect Jet-A mixed in avgas.

    -C.
    clumpinglitter, Oct 10, 2006
    #7

  8. stuckingfk Well-Known Member

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    Jet fuel is heavier than 100 LL and if he did actually sump it, Jet A should have come out first.
    stuckingfk, Oct 10, 2006
    #8

  9. EatSleepFly Well-Known Member

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    It would probably take a few minutes for the Jet-A to settle to the bottom. If he sumped it immediately after it was fueled, it may still be blue.

    I had the misfortune of having a PA31 I was flying misfueled on my very last day flying it. I ordered "12 gallons of 100LL in the outboards", and instead got one of the inboards (which were almost full) topped with Jet-A. :confused: Luckily I caught him in the act before he could top the other inboard. It took 8 hours to find an authorized mechanic, enough containers to hold 55ish gallons, and the tank to be drained/flushed/refueled. That sucked.
    EatSleepFly, Oct 10, 2006
    #9

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