Small valveless
Moderator: Mike Everman
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Small valveless
Hi Guys,
I'd like to build a very small yet reasonably reliable valveless!
Any suggestions as to size and type to go for? The main criteria is that it must be small, thrust is irrelevant...
I'd like to build a very small yet reasonably reliable valveless!
Any suggestions as to size and type to go for? The main criteria is that it must be small, thrust is irrelevant...
re: Small valveless
how small :|
its usually helpful to include something like maximum dimensions. check out these free plans http://beck-technologies.com/freeplans.html, its pretty small
its usually helpful to include something like maximum dimensions. check out these free plans http://beck-technologies.com/freeplans.html, its pretty small
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re: Small valveless
I was thinking about half that size!
Eric, Does your calculator work for engines this small?
Eric, Does your calculator work for engines this small?
re: Small valveless
i believe you can scale that FWE. just divide all the measurements by 2 :D
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re: Small valveless
Hi Nick,
That would fall in line with what I had in mind. I have some 16mm id s/s tube which would be only 0.125mm out from spec at 1/2 scale. Can I really directly scale down all measurements? That route wouldn't work with gas turbines, but I'm only a PJ newbe!
My aim is first to get something very small to work, then see how small I can go while sticking with convntional fuel like propane...
That would fall in line with what I had in mind. I have some 16mm id s/s tube which would be only 0.125mm out from spec at 1/2 scale. Can I really directly scale down all measurements? That route wouldn't work with gas turbines, but I'm only a PJ newbe!
My aim is first to get something very small to work, then see how small I can go while sticking with convntional fuel like propane...
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re: Small valveless
scale the diameters by 1/2, and scale the combustion chamber length by 1/2, scale the length of the tailpipe and intake by around 60%.
I have plans for a micro chinese that I am going to upload to my site soon. The sites not behaving, I am probably going to recode the whole thing and wipe everything and upload the new.
Eric
I have plans for a micro chinese that I am going to upload to my site soon. The sites not behaving, I am probably going to recode the whole thing and wipe everything and upload the new.
Eric
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re: Small valveless
Thanks for the help guys,
That should be enough to get me started!
That should be enough to get me started!
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re: Small valveless
I decided to go for Erics FWE at 50%. Not run yet, only just finished it!
Tricky to make, all in 0.8mm s/s. Didn't have suitable tube for the inlet so machined it from solid bar...
Tricky to make, all in 0.8mm s/s. Didn't have suitable tube for the inlet so machined it from solid bar...
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re: Small valveless
I hope that it runs as good as it looks! Great work!
//Anders
//Anders
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re: Small valveless
Thanks Anders, What size gas nozzle do you think I'll need?
re: Small valveless
interesting choice of sparkplug placement? any reason why you chose it over placing the sparkplug on the dome?
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re: Small valveless
Hmm, I ain´t the right person to answer but I guess that a brake line would be enough. Since the intake area is really small a large diameter injector will block the intake more than necessary...
//Anders
//Anders
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Re: re: Small valveless
Billet intake... that's a new one, for sure. Custom car builders, take note.multispool wrote:Didn't have suitable tube for the inlet so machined it from solid bar...
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re: Small valveless
NickC, I scratched my head over that for a couple of days, even made two front end plates. one formed out of sheet and the other machined from solid with a thicker center to take a 1/4 x 32 thread for a home-made plug but had second thoughts about the complication. The larger 10mm plug would have meant that a large percentage of the front plate would be missing it's concave shape which I was afraid might upset operation. Where its now, the plug is slightly recessed so the tiny chamber shape has been preserved. Well that was the theory anyway...