Search found 111 matches

by jmhdx
Mon Aug 02, 2004 5:52 pm
Forum: Valveless pulsejet forum
Topic: Jam jar substitute?
Replies: 31
Views: 15802

Thankyou Graham, I'll walk up to the strip next time a top fuel event graces the neighbourhood, I'll settle for a jar full as I've just parted company with my employer and the vehicle supplied.
I might find myself back in the engineering trade and once again have access to machine tools.
Mike.
by jmhdx
Thu Jul 29, 2004 9:28 pm
Forum: Off topic forum
Topic: Quite a score
Replies: 5
Views: 2900

I'd like my grave to look like that second picture, I've scoured every supermarket, diy/hardware store and junk shop in the east midlands and have less usable components than that.
Wishing I was still an engineer,
Mike.
by jmhdx
Mon Jul 26, 2004 7:47 pm
Forum: Valveless pulsejet forum
Topic: Jam jar substitute?
Replies: 31
Views: 15802

The fuel seems to be the determining factor for succesfull Reynst pulsators and I haven't found anything that works. Methanol can be found in methylated spirits and de-icer but neither are in sufficient concentration. I've not tried unleaded yet but believe it to be a little too difficult for a firs...
by jmhdx
Mon Jul 26, 2004 7:29 pm
Forum: Valveless pulsejet forum
Topic: Combustion Chamber Length.
Replies: 24
Views: 9836

That is a good way of thinking, and, I think you right that the id ratios lower as the tube gets larger, that would be down to a little extra dia adding up to a lot of extra surface area or volume. I was concluding that a short wide cc would facilitate a larger number of 02 and fuel molecules and fr...
by jmhdx
Sun Jul 25, 2004 1:13 pm
Forum: Valveless pulsejet forum
Topic: Combustion Chamber Length.
Replies: 24
Views: 9836

Well I tried to reply earlier but my computer crashed after writing up a nice big post... So here it is in the shortest possible way. The diamter of the combustion chamber is not equal to its lenght. It is goverened by the dimensions of the valve system you make. Three recomended dimensions are giv...
by jmhdx
Fri Jul 23, 2004 8:33 pm
Forum: Tools and Construction
Topic: For Al Belli - Questions Re Stamping Dies & Production
Replies: 13
Views: 6339

Sombody somewhere is probably already producing exactly what we would like, chamber and tail pipe in a seamless high finish allowing us to play with the front end, if you can wait ten years I'll find it. The Dyna-Jet dies are probably still in existence and the right approach to the right man at sai...
by jmhdx
Fri Jul 23, 2004 6:57 pm
Forum: Valveless pulsejet forum
Topic: Roaring Becomes Elektra
Replies: 93
Views: 60028

Re: Attempted Thrust Measurement

What was the starting problem, really? I found it oddly awkward to work with the engine set up in a vertical position, possibly because this setup forced me to use the blower left-handed. I wonder, too, if there is a tendency for the engine to flood with vapor in this vertical orientation. L Cottri...
by jmhdx
Fri Jul 16, 2004 7:32 am
Forum: Tools and Construction
Topic: No Fabrication Pulsejet
Replies: 7
Views: 4938

It's thick, heavy, but maleable and welds ok. It's a low grade of stainless steel and may corrode under very high temperatures but it looks great. Ideal for testing really as it will take much cutting and welding. More importantly its the only item of this type I've ever seen. I also bought the acco...
by jmhdx
Thu Jul 15, 2004 8:43 pm
Forum: Tools and Construction
Topic: No Fabrication Pulsejet
Replies: 7
Views: 4938

No Fabrication Pulsejet

I in my ever roming occupation have tried to find every component I need in the plethora of diy and hardware stores around the UK and thought this B&Q table leg was good enough to share.
http://www.diy.com/diy/jsp/bq/product/p ... DID=190491
by jmhdx
Thu Jul 15, 2004 8:24 pm
Forum: Off topic forum
Topic: The Beach Was Wonderful
Replies: 17
Views: 5940

The most consilitoray thing I've heard that may relax the enviromentalists among us I've heard is that some time, long after the last two humans have killed each other in a fight over who owns the last apple tree, is that the earth will heal and life will continue on this planet until the sun goes r...
by jmhdx
Thu Jul 15, 2004 8:04 pm
Forum: Off topic forum
Topic: The Beach Was Wonderful
Replies: 17
Views: 5940

Timber is a suprisingly enviromentaly sound fuel, you can only release the same amount of carbon as the tree has absorbed from the atmosphere in the first place. If it comes from a properly managed source its use would not contribute to global warming. Unfortunatelly all the coal and oil we have bur...
by jmhdx
Thu Jul 15, 2004 7:48 pm
Forum: Off topic forum
Topic: Hydrogen
Replies: 9
Views: 2783

Superb wanderings, it's evident that great minds frequent this forum but, guys, be carefull not to post instructions for the manufacture of mind altering substances. I personally don't have the metabolism or emotional solidity to experiment with such things and limit myself to the things that mother...
by jmhdx
Thu Jul 15, 2004 7:23 pm
Forum: Valveless pulsejet forum
Topic: Another jet kart
Replies: 35
Views: 15352

Totally excellent clips, thankyou for posting them, just the motivation I needed. The k-pt01b seems perfectlly scaled/tuned, combustion would appear at its most intense right in the centre of the chamber indicating that a level of compression is being achieved in the right spot thanks to to incoming...
by jmhdx
Thu Jul 08, 2004 7:27 pm
Forum: Tools and Construction
Topic: Jet Formulae
Replies: 1
Views: 1713

If you have no wife, children or anything better to do with your time then simply read all of the posts to this forum and you'll either find what your after or a link to it or perhaps pick up what you do and don't need to know about jet engines. SFC is specific fuel cosumption which would mean fuel ...
by jmhdx
Mon Jul 05, 2004 7:33 pm
Forum: Off topic forum
Topic: Pulse Jet on TV
Replies: 7
Views: 1925

Oh the highs and the lows, I just read this and now know why his development seems to have stopped. It's all his own fault the greedy capitalist, he knew his best chance of making a dollar with his significant developments in propulsion was to 'target' the military market, a billion dollar industry ...