Search found 10813 matches

by Mark
Wed Nov 19, 2003 8:06 am
Forum: Valved pulsejet forum
Topic: Clam baker
Replies: 18
Views: 13298

I think he opened the next crate. This time even better pictures. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=26437&item=2443280457 pieter. I must say it would be fun signing for the package delivered to your front door via the FedEx mailman, around this time of year. Nothing ...
by Mark
Wed Nov 19, 2003 7:38 am
Forum: Valveless pulsejet forum
Topic: Catastrophic failure
Replies: 31
Views: 21061

This all begs the question: "How hot is it getting?" Well, here's your answer. The temperatures are in degrees Reaumur (now rarely seen). The source is a general overview of results of the legendary Project Squid. I hate it when molecules dissociate. It's bad enough dealing with metal fatigue and r...
by Mark
Wed Nov 19, 2003 7:24 am
Forum: Off topic forum
Topic: MOAB
Replies: 7
Views: 3901

Sounds cool! you going to get pictures Mark? as a PS are they still playing with the volatile fuel/air bombs or is the MOAB replacing that one. Viv I really don't know too much about their methodology. I'm no bomb expert, but it seems kind of quirky. It might be interesting to ride in the plane tho...
by Mark
Wed Nov 19, 2003 1:01 am
Forum: Tools and Construction
Topic: Liquid fuel vaporizer
Replies: 22
Views: 12157

Faaascinating. Looks good, you'd need a lot of them, wouldn't you? the biggest is 250g/hr. how would you use this? The raw material, aluminum oxide isn't all that expensive, it's used as a pigment in white paint and for spark plugs and on and on. I would wonder how Al2O3 would hold up under a Maxim...
by Mark
Tue Nov 18, 2003 11:18 pm
Forum: Valveless pulsejet forum
Topic: Worlds simplest valveless?
Replies: 145
Views: 79602

Mike, ask Our Man in Avon and Somerset Police, Nick Ibbitson, about hydroforming. He built one or two BCVP prototypes that way. I'd show a photo, but the Albion Propulsion would be onto me like a ton of bricks. It's a lot of fun and if you're inventive about cutting your patterns, you can produce s...
by Mark
Tue Nov 18, 2003 6:43 pm
Forum: Tools and Construction
Topic: Liquid fuel vaporizer
Replies: 22
Views: 12157

[quote="Bruce"]You would also need to look at the cost-effectiveness and whether these (undoubtedly expensive) little devices would provide any really worthwhile benefit over the tried and true vaporizing pressure-nozzle approach. Then there's the issue of throttle response and (in a valveless engin...
by Mark
Tue Nov 18, 2003 2:02 am
Forum: Off topic forum
Topic: MOAB
Replies: 7
Views: 3901

MOAB

Second test of a 21,700-pound bomb to go bang soon. "Bomb creates a mist of ammonium nitrate and powdered aluminum, which ignites, producing a highly destructive blast." They are dropping it out of a MC-130 E Combat Talon I transport plane, from the rear cargo door. Ought to be exciting if you live ...
by Mark
Sat Nov 15, 2003 1:52 am
Forum: Ramjet forum
Topic: Some show
Replies: 3
Views: 3451

Some show

Did anyone see a show about a nuclear ramjet of sorts? What they did was take a mile of tubing and zigzaged it to store up enough air pressure. A large tank could not have held such pressure. Then they heated up a bunch of steel or some other kind of metal balls to a red heat and passed the stored c...
by Mark
Fri Nov 14, 2003 3:25 pm
Forum: Pulse detonation engine forum
Topic: PJ Alternators and Microwave PDE
Replies: 56
Views: 48750

Mike Everman wrote:Bruno, got no juice (pun intended) for this idea?
I'd go for that nifty arcing effect that happens with gold trim dishes.
Mark
by Mark
Thu Nov 13, 2003 5:12 pm
Forum: Valved pulsejet forum
Topic: Aluminium coated steel valve plates ?
Replies: 12
Views: 7750

Bluing on its own is not a particularly effective method of preventing rust. The reason for this is that it creates a very porous surface layer which allows air to get at the metal below. To stop something that's been blued from rusting you have to oil it. The oil will fill the poors and keep the a...
by Mark
Thu Nov 13, 2003 5:45 am
Forum: Valved pulsejet forum
Topic: Aluminium coated steel valve plates ?
Replies: 12
Views: 7750

I think i will have to try to find the nickel-electroplatingpapers. The platingbath was nothig to spice up thr friday-martini with, but it wasn´t anywhere near the toxicity of most platingbaths i´ve heard of. Not very touchy about current density either as i recall. Temperature was very important...
by Mark
Wed Nov 12, 2003 6:21 pm
Forum: Tools and Construction
Topic: Pre-igntion ignition
Replies: 0
Views: 2551

Pre-igntion ignition

Perhaps like the pulse-detonation tubes that fire a pre-charge of hot gases into the mainstream chamber to facilitate rapid exposions, this plug could be used to help pulsejet combustion or jam jar toy engines do better as well.
http://www.nasatech.com/Spinoff/spinoff2001/t1.html
Mark
by Mark
Tue Nov 11, 2003 1:10 am
Forum: Valveless pulsejet forum
Topic: Reynst Drum
Replies: 7
Views: 5860

just an idea. won't you need to weight the drum down, as when you finally get some combustion in there, is there a possibility that the expanding gas will lift the drum off the grond, even if by only a few mm? T. I just did a straight tubed brass lamp with bamboo artwork on it about 2 feet tall and...
by Mark
Mon Nov 10, 2003 1:57 am
Forum: Off topic forum
Topic: Just strange
Replies: 0
Views: 2057

Just strange

I bought a stiff brown paper mache ostrich egg at a craft store about a year ago with the thought of trying to see if it would jam jar and perhaps be strong enough to lift itself upward, (some top secret research in this area). It holds a good quart/liter of air. I drilled a half inch hole in the po...
by Mark
Sun Nov 09, 2003 5:15 pm
Forum: Valveless pulsejet forum
Topic: Just Another Valveless Front End
Replies: 63
Views: 31453

[quote="Viv"]I prefure the 8 tube layout even though Bruno correctly point out that it is introducing a new varible. Graham wisely councils the reduction of varibles advice that we as a team have learnt the hard way. It would be interesting to have a contest to create the most surreal pulsejet. Have...