Mike's Build Log

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Mike Everman
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Re: Mike's Build Log

Post by Mike Everman » Wed Aug 23, 2017 9:20 pm

Well, more that I want to do liqid fuel for pulsejet and gaseous fuel for pulsepots...
I'm in Costa Rica atm, so not doing anything but dreaming...
Mike
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Nick
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Re: Mike's Build Log

Post by Nick » Thu Aug 24, 2017 6:41 am

Mike Everman wrote:Well, more that I want to do liqid fuel for pulsejet and gaseous fuel for pulsepots...
I'm in Costa Rica atm, so not doing anything but dreaming...
Hey, Costa Rica seems like a good place to do some dreaming :D

I'm only a week off blasting down through Europe on my KTM990! - so I'm dreaming of the alpine passes and the French Riviera.

Mark
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Re: Mike's Build Log

Post by Mark » Fri Aug 25, 2017 6:47 pm

Seems like a good place to look for blue morphos.
https://www.youtube.com/watch?v=29Ts7CsJDpg#t=1m17s
Presentation is Everything

Mike Everman
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Re: Mike's Build Log

Post by Mike Everman » Sat Aug 26, 2017 12:22 am

Looks like one for "natures children", mark.

Have fun, Nick!
Mike
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Mike Everman
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Re: Mike's Build Log

Post by Mike Everman » Sun Aug 27, 2017 2:41 am

I asked Axel Borg (amazingdiyprojects.com) about the fueling on his pulsejet rocket, and got this interesting reply:

Hi Mike, and thanks for hosting such a great forum.

Well, the fuel system challenge was really one of the most joyful and cumbersome difficulties to overcome.
Since the overall structure had to be as light as possible it had to be a liquid fuel system rather than a pulse jet running from a heavy vaporized propane source. My solution was to preheat the propane stored in a WD40 canister fitted with a car tire valve to about 40 degrees Celsius, both to achieve a adequate fuel pressure and partly to make the primary start squirt of liquid propane to vaporize before entering the engine. The fuel is fed into a vaporize chamber which also is the front double walled bulkhead of the pulse jet engine From there three brass fuel tubes goes trough the combustion chamber exiting the tree air intakes, than the tube is bent 180 degrees to direct the now vaporized propane back into the flared intakes. The brass tube is squeezed to a 0.1mm (I think) slit to allow for reliable self start sucking air in whit the propane stream. The engine has to be gradually throttled up and set at idle throttle for 2-3 seconds to allow the vaporizing chamber to build up enough heat to handle the full throttle fuel flow. You will find a more comprehensive and illustrated description of it all in the e- book up for sale on amazingdiyprojects.com

Kind regards/Axel
Mike
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