Search found 60 matches
- Thu Apr 08, 2010 7:51 pm
- Forum: Hybrid Cannons
- Topic: Hydrotesting Vs. Shock Pressure
- Replies: 16
- Views: 6817
well this is good, obviously you don't assume deformation like you said, but i have some of this: http://www.mcmaster.com/#8980k54/=6ksz6v so i don't think i'll get too much deformation before it bursts. i'll have to read that other analysis too. EDIT: dHall, I'm using 80% of the yield strength, and...
- Wed Apr 07, 2010 11:45 pm
- Forum: Hybrid Cannons
- Topic: Hydrotesting Vs. Shock Pressure
- Replies: 16
- Views: 6817
- Sat Apr 03, 2010 2:50 am
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
- Fri Apr 02, 2010 6:12 pm
- Forum: Pneumatic Cannons
- Topic: Auto Loader 32mm
- Replies: 36
- Views: 11423
- Fri Apr 02, 2010 4:57 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
It has numbers every 5 psi, major gradations every psi, and then minor gradations every half psi. Also I have been using my meter pipe for the latest tests, but I think the meter pipe method actually adds more inaccuracy to your measurement system because it necessitates a volume measurement, wherea...
- Thu Apr 01, 2010 11:01 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
I'm sorry, I should have read your posts more thoroughly. Anyway, right now I'm using the 0-30 psi gauge that came with my lpg regulator. (I think it's probably the most accurate gauge I have now, but I plan to get some better ones) Thus I am limited to 2x mixes. I do have a spare welding cylinder o...
- Thu Apr 01, 2010 2:53 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
Oh I don't skimp on hearing protection. I'm studying to be an audio engineer, so my ears are a huge asset. I'm actually worried that even with adequate protection the sonic boom from higher mixes will deal me some permanent damage. Also, " The smoke you've experienced in the chamber could be due to ...
- Sun Mar 28, 2010 10:04 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
- Sun Mar 28, 2010 5:42 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
Tried a couple of 2x shots and so far all have ignited, but I still can't use any more than 6 layers of foil. I'm going to try and tune the mix to see if I can get better combustion. Also there is still quite a bit of smoke left over in the chamber after firing, so that is another hint that my mix i...
- Sat Mar 27, 2010 7:17 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
- Sat Mar 27, 2010 5:12 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
- Sat Mar 27, 2010 3:54 pm
- Forum: Hybrid Cannons
- Topic: HEEELLLLP! (ignition troubles)
- Replies: 16
- Views: 6398
HEEELLLLP! (ignition troubles)
So I began work on my first hybrid a few months ago. It's designed for 20x mixes, made of DOM steel, and has been hydrotested to 3500 psi. Unfortunately, it doesn't fire half the time :-(. I've looked all around this forum, read the wiki, and read Hybrid Fueling 101. First I tried using the chamber ...
- Fri Mar 26, 2010 4:07 pm
- Forum: Hybrid Cannons
- Topic: HYBRID FUELING 101
- Replies: 106
- Views: 297183
- Thu Mar 25, 2010 2:59 am
- Forum: Hybrid Cannons
- Topic: HYBRID FUELING 101
- Replies: 106
- Views: 297183
Sorry to correct the thread again :roll:, but there is one more thing I thought I should add: the proper ratio of air to propane is actually 15.6:1, or 93.9% air. In the first post it is listed as 95.8% air which is a bit lean (too much air). The ratio can be calculated using the method detailed on ...
- Wed Feb 10, 2010 10:25 pm
- Forum: Hybrid Cannons
- Topic: HYBRID FUELING 101
- Replies: 106
- Views: 297183
I was reading over this sticky as it is my first time building a hybrid, and I thought I'd like to point out what I think is missing information. Regarding the chamber pressure method of measuring mixes, you would first calculate the correct amount of propane for say a 10x mix: Vp = ((100/.958)-100)...