Search found 111 matches

by jmhdx
Wed Apr 13, 2005 6:51 pm
Forum: Valveless pulsejet forum
Topic: Using UFLOW to model Reynst-ish engines
Replies: 13
Views: 3760

re: Using UFLOW to model Reynst-ish engines

Thanks for your comments RG, I don't want to re-invent the turbo jet and I think moving parts are best avoided but I do try to mentally explore every possible avenue. I dont think it would be practical to exchange expansion energy for compression as in a turbo jet but the rotating vanes might provid...
by jmhdx
Sat Apr 09, 2005 6:22 pm
Forum: Valveless pulsejet forum
Topic: Using UFLOW to model Reynst-ish engines
Replies: 13
Views: 3760

Re: re: Using UFLOW to model Reynst-ish engines

jmhdx- Yeah, I was kinda thinking about something like that myself. Mark posted a website on Eric,s thread about supersonic shock waves emitted by one of his engines. This site belongs to a researcher exploring toroidal vortices, and he displays some amazing video. Have you seen it? He has found a ...
by jmhdx
Fri Apr 08, 2005 4:08 pm
Forum: Valveless pulsejet forum
Topic: Using UFLOW to model Reynst-ish engines
Replies: 13
Views: 3760

re: Using UFLOW to model Reynst-ish engines

My instincts tell me the seperation of the two chambers would be unecessary. Otherwise that should work. I sketched up a barrel shaped chamber and immediately wondered if it could spin and that led me down a whole new path. Once running as drawn ever increasing a small hole between the two chambers ...
by jmhdx
Sun Mar 20, 2005 3:53 pm
Forum: Off topic forum
Topic: Pulsejet vs Turbine
Replies: 14
Views: 4651

re: Pulsejet vs Turbine

Hi Jetset, did you see the Scrapheap Challenge episode where both ideas were tried? Bruce Simpson built a lockwood the other team a turbo jet, the lockwood valveless won becuase there were no parts to fail, it's almost a hollow tube. I think the speeds were in the 40-50mph range. I live within earsh...
by jmhdx
Mon Jan 24, 2005 8:51 pm
Forum: Valveless pulsejet forum
Topic: Intake into exhaust tube instead of CC
Replies: 9
Views: 2797

Re: Intake into exhaust tube instead of CC

Hi Adam, good to see some fresh ideas on the forum. I thought I'd take the liberty of posting this design again as it has some possibilities. The radial tubes were intended as gas springs, to return some of the blast to aid compression as this design I hope would suck little back up the augmented ex...
by jmhdx
Thu Jan 13, 2005 10:09 pm
Forum: Valveless pulsejet forum
Topic: Proposed CC design
Replies: 48
Views: 15492

Re: Proposed CC design

Hi Adam, with regard to the picture posted by Bill(Hinote) I think I see your point. If a flash of light originated in the spherical end of the bell, the walls were mirrored and the intake and exhaust were of equal exit area indeed more light would escape through the exhaust. I believe it would "foc...
by jmhdx
Sat Jan 08, 2005 5:02 pm
Forum: Valveless pulsejet forum
Topic: Mike's question to K-PT engine series fuel injector types
Replies: 2
Views: 1563

Re: Mike's question to K-PT engine series fuel injector type

Thanks for the detailed reply, I think you might have stumbled upon a cheap, simple albeit crude way of preheating a good volume of gas. Can you lean the motor out well?
by jmhdx
Thu Jan 06, 2005 10:05 pm
Forum: Valveless pulsejet forum
Topic: FWE Theory - Focused Wave or NOT Focused Wave?
Replies: 92
Views: 30978

Re: FWE Theory - Focused Wave or NOT Focused Wave?

(3) To the augmenter assimilation distance discussion: Look at the video. As you can see the shut-off point of the engine is reached at a relatively long distance between the intake/induction pipe mouth and the cone (which is used as an augmenter) mouth. Also notice the engines changes in sound. OK...
by jmhdx
Wed Jan 05, 2005 11:29 pm
Forum: Off topic forum
Topic: Venturi Poem help, anyhting is taking
Replies: 6
Views: 2056

Re: Venturi Poem help, anyhting is taking

Poor spelling really gives the game away!!
Oh and less is more; more, less is. Think Yoda.
by jmhdx
Wed Jan 05, 2005 11:23 pm
Forum: Off topic forum
Topic: Venturi Poem help, anyhting is taking
Replies: 6
Views: 2056

Re: Venturi Poem help, anyhting is taking

Damn.
by jmhdx
Wed Jan 05, 2005 11:09 pm
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 154501

Re: metal jam jar experiments

Hmmmm is right! I see no hmmmmms there. A Chinese is (veeery broadly speaking) a 2-dimensional kind of Reynst. Its intake is a single conduit on one side, rather than an annular slit. So, let's reduce the Reynst to two dimensions. Look at a longitudinal half-section of a Reynst pot. I have added a ...
by jmhdx
Tue Dec 21, 2004 9:57 pm
Forum: Valveless pulsejet forum
Topic: My Kart
Replies: 6
Views: 2061

Re: My Kart

Your engines geometry looks a little under optimized. The combustion chamber seems large for the exhaust and intake pipe diameters, shortening it by a couple of inches might help.
This is possibly the most optimised lockwood, try to copy it's geometry.
[img]C:\My%20Documents\pulse\bg37.jpg[/img]
by jmhdx
Tue Dec 21, 2004 9:16 pm
Forum: Valveless pulsejet forum
Topic: Valveless for R/C Flying?
Replies: 13
Views: 4287

Re: Valveless for R/C Flying?

I was thinking the same thing, you could do a surgical tubing inflated like what's his name in Oregon, and that could be your fuel pump, a collapsing tank of rubber. Then too you could make a feedback mechanism that ran off the heat of the engine to pressurize the fuel line with valving to control ...
by jmhdx
Mon Dec 06, 2004 10:16 pm
Forum: Valveless pulsejet forum
Topic: FWE engine for valveless testing and valveless pulsejet calc
Replies: 45
Views: 14469

Re: FWE engine for valveless testing and valveless pulsejet

Excellent work on the closed end approach, I think it's about nailed the chinese priciple, It's down to where you put the gap in the tube. For a closed end length of pipe there is a mean harmonic when running at L/? the Logan point. I thank Larry for his explanation of this some time ago. I would re...
by jmhdx
Tue Oct 12, 2004 7:22 pm
Forum: Valveless pulsejet forum
Topic: M1E Preview
Replies: 49
Views: 17960

Re: M1E Preview

Hi jmhdx, For an online calculator, go to http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html Al Belli Thanks Al!. The difference is large indeed although I appreciate its not a straightforward application of the math to calculate the effect on pulse combustion. I think we can conclude tho...