Single Rectangular Valve Engine
Moderator: Mike Everman
Single Rectangular Valve Engine
I found this AMAZING easy way of making a valved jet engine, I have access to TIG welding so its nice, might do it with pipe fittings
My Drawing:
The actual engine i got the idea from:
My Drawing:
The actual engine i got the idea from:
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Single rectangular valve engine
Uh, Guys,
I don't mean to rain on anyone's parade but this head design is pretty old. Insofar as I know, 2 gents in PA designed and sold about 1400 Sonajet engines before 1955 and their jets worked modestly well. I have one. Sibley's Craftjet is slightly later and smaller but it, too, is of this design.
The Minijet of 1946 used 4 triangular reeds in a "pyramidal" arrangement, not significantly different from this system.
My experiences indicate these systems are not particularly efficient (either fuel-wise or size-wise,) partly because they do not induce a lot of turbulence in the combustion chambers. Turbulence may be the main reason the Dyna-Jet and its myriad copies are considered to be more desired than other types.
Jerry
I don't mean to rain on anyone's parade but this head design is pretty old. Insofar as I know, 2 gents in PA designed and sold about 1400 Sonajet engines before 1955 and their jets worked modestly well. I have one. Sibley's Craftjet is slightly later and smaller but it, too, is of this design.
The Minijet of 1946 used 4 triangular reeds in a "pyramidal" arrangement, not significantly different from this system.
My experiences indicate these systems are not particularly efficient (either fuel-wise or size-wise,) partly because they do not induce a lot of turbulence in the combustion chambers. Turbulence may be the main reason the Dyna-Jet and its myriad copies are considered to be more desired than other types.
Jerry
Louder is always better.
Single rectangular valve engine
I remember putting some large four petal V valves in a 2.5 inch diameter straight duct and found the same thing. I could never get it to sustain, and I figured the petals were not mixing the methanol well enough, and that the straight duct was too slippery, no transitions to help mixing either. I had a lot of hope but the light titanium tubing duct was just a dud. Maybe if I had put a dish or something behind the reeds, to swirl the air more.
Another thing, if you think of the flower petal reeds buzzing their winglets 220 times a second, that's a lot of fanning action.
If you had a fuel/air sprayer/injector, you could toy with straight ducts, I'm sure they would be willing to run, ala pulsating rocket style.
Another thing, if you think of the flower petal reeds buzzing their winglets 220 times a second, that's a lot of fanning action.
If you had a fuel/air sprayer/injector, you could toy with straight ducts, I'm sure they would be willing to run, ala pulsating rocket style.
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