My thumb really really hurts!

Discussion in 'Off Topic Chat' started by Garbz, May 22, 2008.

  1. Garbz

    Garbz No longer a newbie, moving up!

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    Well since i'm sick i'm doing stupid things as I always do when i'm stuck at home. Atm i'm playing with the precurser to a much larger project to build a pulse jet powered gokart.

    Well while trying to tune my "jar" pulse jet. I thought it stalled, where infact it flamed out. Since it's running from meth I didn't realise it was still burning because the flame is somewhat invisible during the day, so I opened it and in the process spilt some burning meth on thumb.

    Long story short huge blister!

    Short story with happy ending:

    [​IMG]

    [​IMG]



    At least the damn thing worked. Sounds like a very badly tuned motorbike.

    :D
     
  2. BoblyBill

    BoblyBill TPF Noob!

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    Interesting... runs on meth?!?!! as in the drug?!?!?! Pulse jet on a gocart, huh? Sounds like you just a big a nerd as I am, LOL.
     
  3. Rachelsne

    Rachelsne TPF Noob!

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    methylated spirits I asume

    cool picture
     
  4. KevinDks

    KevinDks TPF Noob!

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    Or methanol, which has virtually colourless flames doesn't it? What is causing the bright glow in the jar?

    Anyway, ouch!
     
  5. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    How do I do that? I must know now.
     
  6. PlasticSpanner

    PlasticSpanner TPF Noob!

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    Looks like you need a longer lighting stick too!!!

    Pulse jets are cool! :D
     
  7. Garbz

    Garbz No longer a newbie, moving up!

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    Methanol burns a virtually colourless flame. The blue from the jar comes from the 10 second exposure, taken outside at night in the dark.

    The initial flame isn't too big or too hot so a bigger lighting stick isn't too important, but nothing prepares you for that first woosh when you light it.

    Village Idiot it's a basic principle of a resonant jet engine. You have a sealed combustion chamber and an exit hole tuned exactly to give you a recurring combustion, exhaust, sudden recompression, and recombustion reaction. Getting the hole the right size is the hard bit.

    http://www.instructables.com/id/E4NKU6WICPEXCFO3S5/

    It's fun and safe, just don't run it for longer than 30 seconds or so or the jar will give.
     

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