Moderator: Mike Everman
Mike Everman wrote:I'll have to look back and see what length you started with, but it would be prudent to start with 6x the cc length. I say this because most LH types have thier exhaust throat (another place you could use a little pinch, I'm thinking...) at 25% of the over-all length; so when the intake is roughly the same length as the CC, the tail is 6x the CC length.
Mike Everman wrote:Larry-
I don't know what to think, frankly. Too many variables. The snorkeling into the CC of the intake is a trouble spot in my mind. The short length and it's demands for high frequency operation is another. I think the only hope is if you can get every other rarifaction wave to start the next cycle, and your straight pipe isn't accelerating this return wave, nor do I think it could possibly be a clean, well defined wave after two circuits. Remember when Bruce put the aerovalves on his valve-type body? It barely ran and very anemic. It was much larger than this, and therefore with a better chance to run(?)
I hope you prove me wrong, but I'm just not sure this can possibly ever be more than a blowtorch. I am not quite there with my understanding of flows, and definitely don't know where to begin with Electra, but acoustically I'm getting a bit on firmer ground and it doesn't seem to have the right length proportions. I haven't a clue as to what acoustically happens with the snorkel intake.
OK, that was a long way to say "I don't know Jack". I'm just happy to be here! :-(|)
Rossco wrote:Larry, STOP.
Dont cut the tail off. Extend it first if anything, in my experience itll run too long but never if too short.
I built a similar engine, well, in the way of intake angle. And yep, she is a beutiful sight. The other thing that you really should do is get a shop air compresser air sorce in there. Then you can really see the fire when at full blast. I was going for spinning dense intake air and straight outgoing blast. The tank effect of the intake air streem coming to a dead stop was in theory giving me some pre-combustion compression. Could still work, just a lot of bugs to be ironed out and absticals to get around.
Its one of two engines of mine that would not and will never run. Three if you count the twin engine, but i may just get back to that one day. With out dampening your project at all, my engines would not run with any amount of variables or changes. Now that i have more of an understanding of the beast, i just look at them and shake my head. Proportions are just all out there. But they did get me to were im at today, so they arnt all bad.Rossco
Mark wrote:I'd like to see if it would run with the side port not extending into the combustion chamber, but rather flush with the wall and out of the way of the turbulence inside the center. Just an idea if you run out of other things to try. Nice pictures, I always think pictures add so much.
Another thing to try would be to inject the fuel straight in line with the intake tube, cocked so it was right in the center of the side port tube, the tip aimed straight in the direction of the combustion chamber, like how a typical Logan does it.
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