metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on Nov 6, 2013 15:41:34 GMT -5
I got bored so I build a Gluhareff pressure-jet. Can anyone comment on how it's running? I don't realy have a comparison Video |
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gidge348
Senior Member
Joined: September 2010
Posts: 426 
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Post by gidge348 on Nov 6, 2013 19:00:47 GMT -5
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cursorkeys
Veteran Member
Proper engines use the Brayton cycle
Joined: July 2012
Posts: 108
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Post by cursorkeys on Nov 7, 2013 19:57:38 GMT -5
That's an interesting thing, didn't know they existed until now. Wikipedia says it's a similar concept to a valveless pulsejet.
If it's supposed to run just like a pulsejet it seems to be doing pretty good! If you made up a little sliding jig with a spring-balance and a flow meter for the propane you could work out the efficiency, that might be interesting?
Do you have any close-up pictures of it? And thanks for sharing the vid!
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Post by racket on Nov 7, 2013 20:30:56 GMT -5
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on Nov 7, 2013 20:36:47 GMT -5
If it's supposed to run just like a pulsejet it seems to be doing pretty good! If you made up a little sliding jig with a spring-balance and a flow meter for the propane you could work out the efficiency, that might be interesting? I build this engine from plans and they conveniently state fuel consumption: SFC=6 lb/hr Here's a pre-injector pic. Injector is nothing more than a 1.5mm hole at the end of a tube. Click on the link for the pic, it's too big to post here link |
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cursorkeys
Veteran Member
Proper engines use the Brayton cycle
Joined: July 2012
Posts: 108
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Post by cursorkeys on Nov 8, 2013 5:20:37 GMT -5
Very interesting! Not completely relevant, but I've never looked at early ram-jet aircraft before and had no idea that the terrifying piloted ram-jet thing at the bottom looks to have been actually built: en.wikipedia.org/wiki/Leduc_0.10. I'd kind of assumed ram-jets were mostly ignored until necessary for supersonic use. If it's supposed to run just like a pulsejet it seems to be doing pretty good! If you made up a little sliding jig with a spring-balance and a flow meter for the propane you could work out the efficiency, that might be interesting? I build this engine from plans and they conveniently state fuel consumption: SFC=6 lb/hr Here's a pre-injector pic. Injector is nothing more than a 1.5mm hole at the end of a tube. Click on the link for the pic, it's too big to post here linkThanks a lot for the pic, that makes the inlet easy to see. A nice bit of work there, I'd love to make something like it one day when my sheet metal skills and welding are better. |
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on Nov 8, 2013 9:13:32 GMT -5
I tried a thrust test today and it barely managed 1 pound. Then I heated up the propane tank to see if that made a difference. Turns out I've never had it properly locked in, just growling  so it's not running in the video. When it did lock in, it scared the shit out of me and messed up the crappy thrust stand (It's a real bitch to do with that intake stack in the way) So anyway, no reliable thrust test yet, but a lot more than 1 pound at least! |
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so it's not running in the video. When it did lock in, it scared the shit out of me and messed up the crappy thrust stand (It's a real bitch to do with that intake stack in the way)