Search found 86 matches

by James D
Tue Aug 29, 2006 6:04 pm
Forum: Valveless pulsejet forum
Topic: Prettiest FWE (?) - the 'Lady Anne Boleyn'
Replies: 133
Views: 89421

re: Prettiest FWE (?) - the 'Lady Anne Boleyn'

Would it be possible for you to run it with a piece of flashing under the intake so that it doesnt cool the pipe and we can get a good idea of the temperature gradient across the engine? Yes it would, the difference is quite alarming. I cant quite tell from the pics, but the intake might be able to...
by James D
Sun Aug 27, 2006 4:27 pm
Forum: Valveless pulsejet forum
Topic: Prettiest FWE (?) - the 'Lady Anne Boleyn'
Replies: 133
Views: 89421

re: Prettiest FWE (?) - the 'Lady Anne Boleyn'

Rats. I thought my guess at a fueling point would be a fairly good one. Sounds like you ended up quite a bit farther up the pipe. But, that's good information; it's one of the things we always have to deal with, it seems. I put the fuel pipe as far down the intake as I could without having to bend ...
by James D
Sat Aug 26, 2006 8:58 pm
Forum: Valveless pulsejet forum
Topic: Prettiest FWE (?) - the 'Lady Anne Boleyn'
Replies: 133
Views: 89421

re: Prettiest FWE (?) - the 'Lady Anne Boleyn'

Thanks for the kind words everyone. I ran it again today. Start up was quite simple and easy to repeat, but it did seem to require more air than a standard FWE. I will make a note of the minimum air and fuel pressures next test. The fuel pipe is approximately 2mm ID and terminates about 25mm from th...
by James D
Sat Aug 26, 2006 1:50 pm
Forum: Valveless pulsejet forum
Topic: Prettiest FWE (?) - the 'Lady Anne Boleyn'
Replies: 133
Views: 89421

re: Prettiest FWE (?) - the 'Lady Anne Boleyn'

Graham
I made no deliberate mods, however the overall length is possibly 1mm short and the intake is 0.5mm smaller diameter than Larrys drawing, other than that is pretty accurate and internal transitions are smooth.
by James D
Sat Aug 26, 2006 12:02 pm
Forum: Valveless pulsejet forum
Topic: Prettiest FWE (?) - the 'Lady Anne Boleyn'
Replies: 133
Views: 89421

re: Prettiest FWE (?) - the 'Lady Anne Boleyn'

I tried to run her on propane yesterday, after ten minutes of playing with fuel and air pressure she barked into life.'-) The frequency peaked at 320 Hz and as I increased the fuel it dropped slightly. I will try and get a good thrust measurement today and a longer test run to see if the hot spot mo...
by James D
Mon Aug 21, 2006 9:43 pm
Forum: Valveless pulsejet forum
Topic: Prettiest FWE (?) - the 'Lady Anne Boleyn'
Replies: 133
Views: 89421

re: Prettiest FWE (?) - the 'Lady Anne Boleyn'

Thanks Graham and Larry
I'll go ahead and build it, probably be ready to test on friday.
I really don't mind having to modify it, Should be interesting, now if I could just find some methanol...
by James D
Mon Aug 21, 2006 6:37 pm
Forum: Valveless pulsejet forum
Topic: Prettiest FWE (?) - the 'Lady Anne Boleyn'
Replies: 133
Views: 89421

re: Prettiest FWE (?) - the 'Lady Anne Boleyn'

Hi all
I've started to build this motor as per Larry's drawing, Is it worth finishing?
I don't mind making modifications but should I run it as drawn first?
Thanks
by James D
Fri Jul 28, 2006 4:42 pm
Forum: Valveless pulsejet forum
Topic: Steve W's paired Lockies
Replies: 5
Views: 2185

re: Steve W's paired Lockies

What would happen if both combustion chambers were connected with a small diameter pipe, say 3/4", I wonder if you could tune the length of the pipe to make them run in or out of phase?
by James D
Fri Jul 14, 2006 10:47 pm
Forum: Tools and Construction
Topic: Schlieren video clip
Replies: 9
Views: 4583

re: Schlieren video clip

Hi Dave It's a bit more simple/crude than a focusing schlieren setup, What I basically did was, point a digital camera at a grid of vertical lines on my computer screen, then moved the camera around until it formed a sort of 'Moiré pattern' ,Density gradients between the screen and camera showed up...
by James D
Fri Jul 14, 2006 6:26 pm
Forum: Tools and Construction
Topic: Schlieren video clip
Replies: 9
Views: 4583

Schlieren video clip

Some of you maybe interested in this, Its a really simple technique which involves just a camera and a grid pattern.
It seems quite sensitive, What do you think?
by James D
Sat Jun 17, 2006 3:03 pm
Forum: Valveless pulsejet forum
Topic: Another pocket lockwood success
Replies: 18
Views: 9376

re: Another pocket lockwood success

Nice.
The frequency is around 710 hz, What fuel are you using?
by James D
Mon Jun 12, 2006 8:10 pm
Forum: Valveless pulsejet forum
Topic: Thermojet Videos
Replies: 63
Views: 23997

re: Thermojet Videos

Number47 This is just a minor observation but I think when that ebay guy said to run it on Liquid propane (inverted tank) he must have been talking about a small Bernzomatic type gas tank, That's the only way it would make any sense. It still looks like a pos though. Just out of interest, If you plu...
by James D
Sat Jun 03, 2006 7:28 pm
Forum: Valveless pulsejet forum
Topic: Pulsed Flow & Vortex Formation
Replies: 10
Views: 3350

re: Pulsed Flow & Vortex Formation

I have little understanding of this, but why would the vortex not get bigger as it moved down the ejector?

It would be fun to try and visualise it using a high speed camera and smoke.

Real nice renders btw.
by James D
Mon May 29, 2006 5:12 pm
Forum: Tools and Construction
Topic: EBay musings
Replies: 686
Views: 184283

re: EBay musings

Heres another Ebay item that may have Pulse Jet potential.

http://tinyurl.co.uk/7yqg

If you cut the rim off it would make a great leading edge for an augmenter maybe?
The material is probably really thin & poor quality but it just looks like a useful shape.
by James D
Sun May 28, 2006 7:22 pm
Forum: Valveless pulsejet forum
Topic: My 55 lbs Lockwood
Replies: 24
Views: 10111

re: My 55 lbs Lockwood

This thread is a couple of months old, He got it running in the end.

http://www.pulse-jets.com/phpbb2/viewtopic.php?t=2888