Search found 10750 matches

by Mark
Sat Oct 25, 2003 5:09 pm
Forum: Valved pulsejet forum
Topic: Clam baker
Replies: 18
Views: 10761

Re: Clam baker

There is a pulsejet you can look at for sale on eBay. Just type the word "pulsejet". I think it might be a Katydid, or about the same size. It's all of 30 pounds and produces 110 lb static thrust. Ok, all you terrorists, buy it now. Mark Going once, going twice, going three times now. Get them whil...
by Mark
Sat Oct 25, 2003 1:49 am
Forum: Off topic forum
Topic: Rand Cam engine
Replies: 9
Views: 4782

Re: Big putt-putt

Mark, I think we've had it in the forum before. It is a grown-up version of the putt-putt toy boat engine, done by the guy who actually started with those toys. The thing was tested on real-life boats, too, with some success. It worked well, but it just isn't that much better than the stuff people ...
by Mark
Sat Oct 25, 2003 1:22 am
Forum: Valveless pulsejet forum
Topic: Scaling Up and Down
Replies: 10
Views: 5743

One thing to watch though Bill, is that the 4-tube LH (ie: Kentfield) has (by the time you take those four intake tubes and the turbulence they produce into account) a rather high cross-sectional area and is aerodynamically "dirty". This means that at high-speeds you'll be wasting a lot of power si...
by Mark
Fri Oct 24, 2003 11:28 pm
Forum: Valved pulsejet forum
Topic: Scam Alert !!!!
Replies: 2
Views: 2456

Re: Scam Alert !!!!

Awhile back, I asked at the old forum if anyone had built the pulsejet from plans located at; http://members.aol.com/Youcanbuildit/ENGINES/Webpage2.htm Herc Designs, look down the page for the "NOVA 2". I can't remember the various answers and I can't find the thread on the old site, but some peopl...
by Mark
Thu Oct 23, 2003 10:00 pm
Forum: Off topic forum
Topic: Rand Cam engine
Replies: 9
Views: 4782

Jesus, is there any way to slow down the pesky animation? My head spins. Offhand, it looks like a version of a vane-type compressor, but there's obviously an additional twist in there. Bruno Don't know if this has been posted before, but here it is, a squidly looking water pulsejet. http://www.delp...
by Mark
Tue Oct 21, 2003 10:14 pm
Forum: Valved pulsejet forum
Topic: Clam baker
Replies: 18
Views: 10761

Pieter van Boven wrote:I think he didn't sell his first pulsejet. The bidding stopped at $830 and I think he wants more for it.

Pieter.

Looks like the first one went for more than I could afford.

http://cgi.ebay.com/ebaymotors/ws/eBayI ... 2437008667
by Mark
Tue Oct 21, 2003 4:24 am
Forum: Valved pulsejet forum
Topic: Clam baker
Replies: 18
Views: 10761

I think he didn't sell his first pulsejet. The bidding stopped at $830 and I think he wants more for it. Pieter. Maybe you are correct, I followed it to the last day but not to the last minute. I was talking to Don Laird today, he drew the Dynajet drawings you sometimes see, and he said this engine...
by Mark
Tue Oct 21, 2003 4:07 am
Forum: Valved pulsejet forum
Topic: Pulse jet problems
Replies: 4
Views: 3418

Re: My pulse jet

Dear Mark, always when I start my pulse jet it starts to run but then some air comes out from the venturi and stops, are my pulsejet valves to small ??? It's really hard to say what could be the matter without seeing what you are working with. Maybe your valves aren't getting closed fast enough and...
by Mark
Mon Oct 20, 2003 5:14 pm
Forum: Valved pulsejet forum
Topic: Pulse jet problems
Replies: 4
Views: 3418

Re: Pulse jet problems

I wrote something about my pulse jet last week and this weekend my pulsejet run but under air suply. My pulsejet starts to run but then I can't stop the air suply with some pressure, over the flowinjector. I think I need more gasoline to run the pulsejet!!!! If that is the case, watch the fuel line...
by Mark
Mon Oct 20, 2003 2:21 pm
Forum: Valved pulsejet forum
Topic: Ba-da boom
Replies: 5
Views: 3269

Re: Ba-da boom

>When my brother brought over his Nov. issue for me to see, I noticed it was the same conception as the elderly man in the wacky pants standing next to it in some previous topic this forum had featured. The "elderly man" in the picture is none other than Burt Rutan's brother Dick, who piloted the V...
by Mark
Mon Oct 20, 2003 1:57 am
Forum: Valved pulsejet forum
Topic: Ba-da boom
Replies: 5
Views: 3269

Ba-da boom

That's the title of an article in Air and Space's magazine Nov. 2003. It has the 4-tubed wonder, a General Motors Quad 4 cylinder head that controls the flow. Two truck superchargers are driven by a two-stroke engine. The article says don't try to buy any Quad 4's in any Dayton area junkyard, becaus...
by Mark
Sun Oct 19, 2003 8:09 pm
Forum: Valved pulsejet forum
Topic: Clam baker
Replies: 18
Views: 10761

I think he didn't sell his first pulsejet. The bidding stopped at $830 and I think he wants more for it. Pieter. Maybe you are correct, I followed it to the last day but not to the last minute. I was talking to Don Laird today, he drew the Dynajet drawings you sometimes see, and he said this engine...
by Mark
Sun Oct 19, 2003 2:38 pm
Forum: Rocket forum
Topic: Newspaper
Replies: 4
Views: 3028

Re: Newspaper

I lost the link to the "Rogue Movies" site with the exploding KNO3-newspaper rocket, but have a few thoughts to add on my own. First of all, Rogue Guy's rocket almost certainly burst because he sucessfully got too much surface area to burn. Newsprint propellant burns slowly, but that doesn't matter...
by Mark
Sun Oct 19, 2003 1:31 pm
Forum: Valved pulsejet forum
Topic: Clam baker
Replies: 18
Views: 10761

Re: Clam baker

There is a pulsejet you can look at for sale on eBay. Just type the word "pulsejet". I think it might be a Katydid, or about the same size. It's all of 30 pounds and produces 110 lb static thrust. Ok, all you terrorists, buy it now. Mark Ok, so you didn't bite on the first one up for sale, not to w...
by Mark
Sat Oct 18, 2003 1:06 pm
Forum: Valved pulsejet forum
Topic: Improved Tundra-Jet Valve Array
Replies: 25
Views: 12962

Re: Behavior of Reed Valves - Lessons from the DynaJet

Gentlemen - There is another approach, taken in the venerable Dynajet, that works well, at least in fairly small size valves: I believe that the retainer is NOT designed to take the reed hitting 'all at once', but rather that the valves 'roll out' onto the retainer without kinking, and with the ben...