Search found 1575 matches
- Thu Feb 29, 2024 3:24 pm
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
The ID sounds exactly right. The outside diameter is a bit sus, but it doesn't really matter, only inside diameter matters. If you want to be sure, print the pipe and measure. you could also post an autocad file of the flat pattern here, then I'll check it. If you do, note which part it is.
- Wed Feb 28, 2024 10:24 pm
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
I don't recommend overlapping edges, it impedes air flow. I use Sketchup with a lot of "CAD-CAM" stuff because it's very flexible. I use a small plugin "unfold" that allows you to unfold faces. Sketchup has a fairly low resolution so I just click on every face of the cone, or whatever else kind of m...
- Wed Feb 28, 2024 6:58 pm
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
For layouts, I use Sketchup. I "unfold" the models myself so I have to compensate for material thickness. I don't have experience with sheet metal in solidworks, but if the program compensates for sheet metal thickness, you don't need to change anything. Can you print a pattern for a straight pipe o...
- Wed Feb 28, 2024 10:55 am
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
"All the dims I have been dealing with are internal dims, are you saying I should add additional width on to the dimension of the flat pattern, based off a part modelled on the ID? I've never had to work sheet metal to this accuracy before." No, increase the diameter of your pipes and cones by 1.8mm...
- Wed Feb 28, 2024 12:16 am
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
That's a great deal, go for it. Don't forget you have to compensate for the sheet thickness in your flat patterns: all dimensions in these drawings are internal so if the sheets are cut with the dimensions as stated, your engines' diameters will be off by 0.9x2=1.8mm. Also have the intakes cut sligh...
- Sun Feb 25, 2024 9:32 pm
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
I use 0.8mm wire. The paper you linked discusses a valved engine. Valved engines do not have a protruding intake or a coned exhaust so effective length=engine length (maybe not including the small length at the front of the engine taken up by the valve) and mean diameter is what it sounds like. It's...
- Sat Feb 24, 2024 10:54 pm
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
I think your best bet is to get some scrap sheet steel from the scrapyard. It's where I get all my stainless. You can roll of hammer it into the pipes you need. 304 works fine for pulse-jets and is much cheaper too. Go for the 0.9mm stuff as it is easier to work with (and cheaper). In my experience,...
- Thu Feb 22, 2024 11:42 pm
- Forum: Valveless pulsejet forum
- Topic: Please put your "I am new and need help" question here.
- Replies: 404
- Views: 1948434
Re: Please put your "I am new and need help" question here.
I can answer questions 3 to 5, to a degree. I don't really understand what you are getting at with the first 2. 3: You can get 3" pipe from exhaust manufacturers. Although having a smooth 180 degree bend is ideal, you can definitely get away with cutting straight pipe up into six 30 degree segments ...
- Wed Feb 07, 2024 6:01 pm
- Forum: Tools and Construction
- Topic: Odds and ends
- Replies: 1850
- Views: 829741
Re: Odds and ends
That comes with age
- Wed Nov 15, 2023 2:45 pm
- Forum: Valveless pulsejet forum
- Topic: More free plans: 40 pound Chinese
- Replies: 192
- Views: 825247
Re: More free plans: 40 pound Chinese
Good job on the flares. It looks like you are still not getting nearly enough fuel to your engine. Are you using a full, or fairly full propane tank? What's the temperature over there? If it's freezing, you might not be able to start the engine even with a full propane tank. Something I would not ad...
- Fri Nov 10, 2023 8:11 pm
- Forum: Valveless pulsejet forum
- Topic: More free plans: 40 pound Chinese
- Replies: 192
- Views: 825247
Re: More free plans: 40 pound Chinese
Hi Redstone, welcome to the forum I have some notes: 1: Lose the regulator. You will never get this engine to run without full flow from your propane tank 2: Looks like you MIG welded your engine. Try spot-welding the slits you have at the end of your intakes closed and then file the welds smooth on...
- Fri Oct 06, 2023 6:27 pm
- Forum: Valveless pulsejet forum
- Topic: Mike's Build Log
- Replies: 441
- Views: 332018
Re: Mike's Build Log
About time someone posted something here again! See what I did there?....I'll let myself out. Nice clock Mike!
- Fri Oct 06, 2023 6:26 pm
- Forum: Off topic forum
- Topic: youtube
- Replies: 1512
- Views: 552047
Re: youtube
I like how they answered their own question in the video title. No clickbait.
- Tue Apr 04, 2023 11:20 pm
- Forum: Pulse detonation engine forum
- Topic: Cool video on the progress of NASAs pulse-detonation efforts
- Replies: 1
- Views: 1625
- Sat Mar 25, 2023 12:29 pm
- Forum: Valveless pulsejet forum
- Topic: Mike's Build Log
- Replies: 441
- Views: 332018
Re: Mike's Build Log
Hi Mike,
Have you ever gotten around to play with these engines some more?
Have you ever gotten around to play with these engines some more?