Search found 571 matches

by Graham C. Williams
Sun Feb 21, 2010 12:58 pm
Forum: Valveless pulsejet forum
Topic: Lady Anne variation.
Replies: 172
Views: 36353

Re: Lady Anne variation.

Hi. Yes Send me a PM and I'll send you a late drawing.

Graham.
by Graham C. Williams
Fri Jun 19, 2009 4:15 pm
Forum: Valved pulsejet forum
Topic: Nice!
Replies: 1
Views: 760

Nice!

See:
http://www.onthewire.co.uk/hpitbox3.htm
for the full story.

Graham
by Graham C. Williams
Wed Apr 29, 2009 12:06 am
Forum: Valveless pulsejet forum
Topic: Annual JET FEST proposal
Replies: 9
Views: 1170

Re: Annual JET FEST proposal

Meeting James makes me want to get on with designing that CV Combustion Turbo jet!!


Graham.
by Graham C. Williams
Tue Apr 28, 2009 11:52 pm
Forum: Valveless pulsejet forum
Topic: Annual JET FEST proposal
Replies: 9
Views: 1170

Re: Annual JET FEST proposal

I found it interesting to compare the running of two motors of similar thrust but differing approaches to thrust production. Mikes motor (27 N/L) and My motor (22-23N/L) have about the same effective CC dia and produce about 5Lbs thrust. You know these motors so I will not repeat the fine points her...
by Graham C. Williams
Sun Apr 26, 2009 2:40 pm
Forum: Valveless pulsejet forum
Topic: Annual JET FEST proposal
Replies: 9
Views: 1170

Re: Annual JET FEST proposal

It's a lovely site, well in the sun at least. When not running Jet motors it's a firing range.

Ah Nick, did I leave my ear protection with you?
Yes, the fresh eggs were lovely, big thanks.

Graham.
by Graham C. Williams
Fri Apr 10, 2009 7:09 pm
Forum: Valved pulsejet forum
Topic: petal valves in dead end ?
Replies: 9
Views: 4074

Re: petal valves in dead end ?

Hi.
The first question must be: Do I want or need to admit extra air?
At speed you may need to reduce the flow through the valve!

Graham
by Graham C. Williams
Tue Mar 31, 2009 11:30 pm
Forum: Valveless pulsejet forum
Topic: Trouble with new pulsejet design
Replies: 5
Views: 3972

Re: Trouble with new pulsejet design

Hi. I have to go along with Mike. Without testing the model I'd say 'The Exhaust looks very short'. Try making it about 2 to 3 times as long as you have it now. and The induction pipes look a little too small, I mean the induction dia. This is an odd one because you can get motors running with very ...
by Graham C. Williams
Thu Mar 26, 2009 9:54 am
Forum: Valved pulsejet forum
Topic: ~ × & Σ …
Replies: 25
Views: 3271

Re: ~ × & Σ …

Hi.

How have you created a negative frequency?

Graham.
by Graham C. Williams
Thu Mar 26, 2009 9:39 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 76564

Re: Mike's Build Log

Dear Mike. What a lovely little motor (>5Lbs) Well done! Ref the lower thrust value. It is a possible that the motor is producing negative thrust (Positive thrust but in the other direction) at your lowest fuel settings, it's easy enough to check. What impresses me is the resonate combustion at thes...
by Graham C. Williams
Fri Mar 13, 2009 9:20 am
Forum: Valveless pulsejet forum
Topic: "Thunderchine" 55 lb thrust pulsejet plans
Replies: 142
Views: 32887

Re: "Thunderchine" 55 lb thrust pulsejet plans

Hi Grim. Ok, apologies for being a little negative. I notice you've addresses the issues of Rolling resistance in your design. Bicycle type tires, light weight but strong construction. Thin with small contact area and high pressure. Have you given thought to isolating the motor vibration from the fr...
by Graham C. Williams
Wed Mar 11, 2009 8:53 pm
Forum: Valveless pulsejet forum
Topic: "Thunderchine" 55 lb thrust pulsejet plans
Replies: 142
Views: 32887

Re: "Thunderchine" 55 lb thrust pulsejet plans

Well Done! Good design and a great build. Grim, M. and Rossco. What a team!! Hmm, I'm not so sure about the cart design. I've been close to a running Lockwood and can only imagine this motor is no more comfortable to be near. It was one of Rossco's fellow countrymen (Gary)that likened it to "Wanting...
by Graham C. Williams
Tue Feb 17, 2009 12:22 pm
Forum: Valveless pulsejet forum
Topic: Messerschmitt design?
Replies: 11
Views: 1869

Re: Messerschmitt design?

The Full size -06 and -07 motors, at the top of this page, have the material thickness marked on the drawing.
The 100mm dia CC Type06 would probably be ok if built from anything between 0.5mm and 1mm depending upon skill level.

Graham
by Graham C. Williams
Tue Dec 23, 2008 2:04 pm
Forum: Valveless pulsejet forum
Topic: FWE with increased Throttle Range?
Replies: 105
Views: 9272

Re: FWE with increased Throttle Range?

Hi Larry and Joe. Detached flow, related to conical half angle and the operating conditions, appears to be a limiting factor to design. 5 degrees + or - 1 degree is about as much as you can do. At first sight, this consideration seems to be more important in the tailpipe than the CC back cones. Look...
by Graham C. Williams
Sun Dec 14, 2008 9:22 pm
Forum: Valveless pulsejet forum
Topic: Combustion window
Replies: 16
Views: 2016

Re: Combustion window

Dear James.
An amazing video. I love the way combustion moves about the CC.

Regards
Graham.
by Graham C. Williams
Thu Dec 11, 2008 9:25 pm
Forum: Valveless pulsejet forum
Topic: New guy getting started
Replies: 53
Views: 4050

Re: New guy getting started

That's great! It feels good when you get your first motor running.
Now that learning curve is out of the way the world of pulse jets is yours for the taking!!!

Good work, congratulations and I hope the neighbours like it?

Graham.