Search found 1550 matches

by metiz
Wed Jan 20, 2016 12:15 pm
Forum: Valveless pulsejet forum
Topic: Help finding lockwood-h jet plans!!!
Replies: 10
Views: 7342

Re: Help finding lockwood-h jet plans!!!

Sorry, incomplete answer. yes, using the 0.065 U bend is fine.
by metiz
Wed Jan 20, 2016 8:37 am
Forum: Valveless pulsejet forum
Topic: Help finding lockwood-h jet plans!!!
Replies: 10
Views: 7342

Re: Help finding lockwood-h jet plans!!!

for a large engine like the Lockwood, you can get away with "beating the crap" out of the metal to get the right shape, but don't go overboard. The dimensions are sacred, the shape (e.g., slightly oval, small dents etc) are not. When I say cut up the cone, I mean lenghtwise, yes. hand bending short,...
by metiz
Tue Jan 19, 2016 5:12 pm
Forum: Valveless pulsejet forum
Topic: Help finding lockwood-h jet plans!!!
Replies: 10
Views: 7342

Re: Help finding lockwood-h jet plans!!!

Thanks for all they help guys. We have started building the 55 lb engine recommended earlier. Were ready to cut and roll all of our pieces, but we are stuck on the u bend. In the plans it says the u bend is 3 inch id all the way around, and the exhaust cone minor opening is 3inch Id also. The only ...
by metiz
Wed Jan 13, 2016 3:45 pm
Forum: Gas turbine forum
Topic: 3D-printed jet engine, sort of...
Replies: 5
Views: 7084

Re: 3D-printed jet engine, sort of...

hehe nice. make a bigger version to clean your driveway in the winter
by metiz
Wed Jan 13, 2016 3:42 pm
Forum: Valveless pulsejet forum
Topic: Help finding lockwood-h jet plans!!!
Replies: 10
Views: 7342

Re: Help finding lockwood-h jet plans!!!

Yeah, you'd do π*(d+(2*material thickness)). Butt the edges of the pieces, don't overlap. Roling the sheet steel into cones will decrease the material thickness some but that's negligible so no need to compensate for that. If you use mild steel, go with the 16 gauge. the cone layouts have a radius, ...
by metiz
Mon Jan 11, 2016 11:37 pm
Forum: Valveless pulsejet forum
Topic: Help finding lockwood-h jet plans!!!
Replies: 10
Views: 7342

Re: Help finding lockwood-h jet plans!!!

1st page of the looking for plans thread. 55 pounds. have fun download/file.php?id=11410&mode=view
by metiz
Sat Jan 02, 2016 9:35 pm
Forum: Valveless pulsejet forum
Topic: More free plans: 40 pound Chinese
Replies: 182
Views: 762691

Re: More free plans: 40 pound Chinese

https://www.youtube.com/watch?v=jkleN5x ... uscomments
New M40 build to celebrate the new year
by metiz
Sat Jan 02, 2016 1:18 am
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 383
Views: 1837438

Re: Please put your "I am new and need help" question here.

Hello I am looking to make a pulse jet to put on a bike or small riding kart as a project for a school fair. I am looking for dimensions/plans for a Lockwood-hiller style valvless pulse jet with enough thrust to get our bike or kart moving. Obviously the more thrust the happier we will be, but we s...
by metiz
Tue Oct 06, 2015 9:27 pm
Forum: Valved pulsejet forum
Topic: Pressure gain combustor (for real!)
Replies: 7
Views: 6755

Re: Pressure gain combustor (for real!)

How could your engine be used in, or with turbines?
by metiz
Mon Oct 05, 2015 5:45 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 383
Views: 1837438

Re: Please put your "I am new and need help" question here.

I'd suggest trying a smaller 50 pound lockwood first with a proven design. I deduce that you have a welder, so at least try to get some sheet metal. Also try "pyrojoe's recipe for beginners" for easy to follow instructions for your own design
by metiz
Mon Oct 05, 2015 1:22 pm
Forum: Valved pulsejet forum
Topic: Pressure gain combustor (for real!)
Replies: 7
Views: 6755

Re: Pressure gain combustor (for real!)

tufty wrote:I'm sure we'd all be interested in more details.
All three of us!

Very nice work Bona! Good to see some progress going on still. Can you share any more data, like the workings, without going into too much detail?
by metiz
Fri Aug 14, 2015 10:38 pm
Forum: Tools and Construction
Topic: Metal Spinning Viable Construction Method?
Replies: 2
Views: 3132

Re: Metal Spinning Viable Construction Method?

Maybe if you're going into some serious production runs. Otherwise, I don't see the benefit over the "traditional" way. Also, I think more people have welders than lathe's with the equipment to do this.
by metiz
Fri Aug 07, 2015 3:07 pm
Forum: Tools and Construction
Topic: Cooling HK pulse jet
Replies: 2
Views: 3137

Re: Cooling HK pulse jet

I'm pretty sure you can run a hobbyking pj for longer than 10 seconds without ruining it. I've see plenty of youtube vids of people doing just that. https://www.youtube.com/watch?v=FmgCkBOYDHY If you're realy worried though you could inject water vapour in the intake. Be aware that this will increas...
by metiz
Sat Aug 01, 2015 8:38 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 383
Views: 1837438

Re: Please put your "I am new and need help" question here.

Hi Gerre, Yes. I can't comment in depth since I'm not knowledgeable enough, but Kadency, Helmholtz and Rijke are all effects that are fundamental to pulse-jets. You might also want to include the Rayleigh Criterion and Reynst's work on pulsating combustion systems. Here's a paper I found while googl...