Search found 571 matches

by Graham C. Williams
Wed Jul 23, 2008 10:53 am
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Induction changes.
I notice some dimensional changes to the induction pipes. Most importantly the location of the induction entry has changed a little. I'll post a new drawing ASAP.

If anyone needs the new dims now I can produce a ‘not to scale’ drawing in a few mins.

Graham.
by Graham C. Williams
Wed Jul 23, 2008 10:27 am
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Graham - ---CUT---. What's the total engine weight at this point? L Cottrill Dear Larry. I now have the motor. It looks good on the desk. Ok. As made from 1mm thick S.S. Without sparkplug and without mount and injectors and with a nut for spark plug mounting she weighs 729 grams. What do you think ...
by Graham C. Williams
Mon Jul 21, 2008 5:10 pm
Forum: Valveless pulsejet forum
Topic: Quick Check on definitions
Replies: 9
Views: 2011

Re: Quick Check on definitions

Hi. You will observe gas Kadenacy in a Valved PJ only as a result of the underlying wave structure. Again simplistically, think of the Valved pulsejet as a Quarter wave pipe for part of the cycle. You can think of the massflow inside the pipe as part of the overall wave structure. I don't know a lot...
by Graham C. Williams
Mon Jul 21, 2008 3:48 pm
Forum: Valveless pulsejet forum
Topic: Quick Check on definitions
Replies: 9
Views: 2011

Re: Quick Check on definitions

Back again. In answer to your question. I guess you could say, Kadenacy is one of the observed results of all this waves stuff. The waves structures: resonance, expansion waves and compression waves being the fundamentals that result in the Kadenacy observations. I'm sure you can think of a better w...
by Graham C. Williams
Mon Jul 21, 2008 2:47 pm
Forum: Valveless pulsejet forum
Topic: Quick Check on definitions
Replies: 9
Views: 2011

Re: Quick Check on definitions

Dear Grant. It is my opinions that the concepts bound up in Kadenacy are of limited use and best avoided once you want to get past the basics. I'm sure it has been done but at the moment I cannot think of a valveless pulsejet motor that has been designed upon these principals. Spend some time with U...
by Graham C. Williams
Fri Jul 18, 2008 6:40 pm
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Oh dear Sorry . I must learn to open my mouth less?
Graham.
by Graham C. Williams
Fri Jul 18, 2008 5:50 pm
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Yes it would be fun to try, is the current injector location a point of entrainment or pressure? try it with a ring of holes but bump up the chamber volume behind it so it pumps a bit, it if likes it then it should also lower the sfc Viv Was it Puttman and Dennis that said " One of the conditions f...
by Graham C. Williams
Wed Jul 16, 2008 8:52 pm
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

The simplicity and accuracy of the thrust stand is inarguable so we wont have to worry about the quality of the figures produced. All in all a very credible design and build, well done to all who participated. Viv Hi Viv. How do you think we could try the old 'Collins Collar’ on this thing? I guess...
by Graham C. Williams
Wed Jul 16, 2008 8:45 pm
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Mike Everman wrote:Wow! That's nice work. What's the major diameter of the CC?
Good evening Mike.
64mm. Appart from the CC Front Cone and the Tailpipe end Dia it's the same motor.

Best Regards
Graham.
by Graham C. Williams
Wed Jul 16, 2008 2:34 pm
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Wow! That really kicks it up a notch. Good work. I see some trends forming in CCs that generate good thrust. The CC core tends to be long and narrow. I think of the little Estes rocket motors that have the long skinny cores, probably not related, but it keeps coming to mind. Joe Dear Joe. Yes, the ...
by Graham C. Williams
Wed Jul 16, 2008 1:18 pm
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Graham - Now THAT's more like it! Did you work out the new layout entirely in theory, and have James cut and weld, or what? What's the basis for the extended chamber dome? Very cool, to be sure. What's the total engine weight at this point? L Cottrill Dear Larry. I thought you'd like it! The craftm...
by Graham C. Williams
Wed Jul 16, 2008 9:36 am
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 72633

Re: Lady Anne variation.

Good morning all. James D. has been kind enough to make some small modifications to this motor. Here are some pictures. With a bit of luck James will upload a short video for us. I look forward to seeing that. The fuel is Propane. The Thrust has increased to a little below 5 Lbs (2.25Kgf = 22.065 N ...
by Graham C. Williams
Wed Jun 11, 2008 4:03 pm
Forum: Valveless pulsejet forum
Topic: Lady Jane Grey
Replies: 39
Views: 8170

Re: Lady Jane Grey

Dear Larry.
What do you think? It looks to me as if the induction pipes are an inch or so too short. I'm comparing this motor with the The VIII Rev06 motor of James D. Perhaps an adjust able section in the induction pipe would help.

Graham.
by Graham C. Williams
Sat Jun 07, 2008 2:08 pm
Forum: Valveless pulsejet forum
Topic: Interested ?
Replies: 248
Views: 53142

Re: Interested ?

As I cannot accurately model Mikes excellent motor with NUDiS I have no hope of getting near to his values. Really? Why is this? (ie., is it something you are able / care to explain?) The geometry looks unexceptional. I would be interested in anything you have to say on this topic; if you do not wi...
by Graham C. Williams
Sat Jun 07, 2008 10:37 am
Forum: Valveless pulsejet forum
Topic: Interested ?
Replies: 248
Views: 53142

Re: Interested ?

Graham: Taking the dimensions for this pulsejet from the "FWE family tree" posted by Larry (March 6, 2007) I calculate the minimum volume as about 0.85 liters. Admittedly, I estimated the missing dimensions, but it is not possible that I missed 120 ml. Can you double check your numbers? Is it possi...