Search found 33 matches
- Tue Mar 03, 2009 7:01 pm
- Forum: Hybrid Cannons
- Topic: HYBRID FUELING 101
- Replies: 106
- Views: 297178
It almost seems like a mistake. He might have meant to say, "precise to within 0.1 psi". I'd ask. No, the meter is accurate to 1 PSI. For digital displays "precision" simply describes the resolution of the display. +/- 0.2 or 0.1 PSI for this digital display. There is no relationship between "accur...
- Tue Mar 03, 2009 5:48 pm
- Forum: Hybrid Cannons
- Topic: HYBRID FUELING 101
- Replies: 106
- Views: 297178
- Mon Nov 17, 2008 9:38 pm
- Forum: Combustion Cannons
- Topic: can someone crunch the numbers for me?
- Replies: 9
- Views: 2261
- Sat Nov 15, 2008 2:41 pm
- Forum: Combustion Cannons
- Topic: can someone crunch the numbers for me?
- Replies: 9
- Views: 2261
- Thu Nov 13, 2008 3:01 pm
- Forum: General How-To & Discussion
- Topic: Request for PVC Burst Pressures Test Results
- Replies: 18
- Views: 3306
As this has come up, I'd like to take the opportunity to reiterate my request - any takers? :D I'll second that request. I might just carry out that experiment using an HPA tank. Any suggestions on how to connect a steel pipe to the end caps. I think I would use steel pipe for the pressure hose. Pl...
- Wed Nov 12, 2008 11:10 pm
- Forum: Hybrid Cannons
- Topic: Ignition past valve / Ignition by fuze
- Replies: 8
- Views: 2327
I played around with gasEQ. Does someone mind checking to see if the following would be reasonable for an insane 12X accident (maybe I should stay away from this stuff): [Conditions] 3 Adiabatic T and composition at const V [Reactants] ------------ No.moles ------------ Mole fraction H2 ------------...
- Wed Nov 12, 2008 10:39 pm
- Forum: General How-To & Discussion
- Topic: Request for PVC Burst Pressures Test Results
- Replies: 18
- Views: 3306
In my opinion the fatal blow to pvc hybrids came when noname's sch80 one exploded at 2x. There is no way I'd use pvc after such a low pressure failure, even if his pipe did have a defect. Wow, I guess this is only useful data for normal combustion cannons and pneumatic cannons. I guess it's possibl...
- Wed Nov 12, 2008 10:35 pm
- Forum: Hybrid Cannons
- Topic: Hybrid Hydrogen Fuel Canisters
- Replies: 10
- Views: 2366
Thanks guys, Lentamentalisk , what kind of calculations can be used to find the spontaneous ignition point of hydrogen/oxygen? Off to do some more reading on electrolysis (please don't think I just randomly throw out ideas I have not done any reading on)... rp181 , does sodium hydroxide totally prev...
- Wed Nov 12, 2008 12:43 am
- Forum: General How-To & Discussion
- Topic: Request for PVC Burst Pressures Test Results
- Replies: 18
- Views: 3306
Request for PVC Burst Pressures Test Results
Hello All, This is a request for anyone to post their experiences with PVC at high pressures, whether it burst or not. I am most interested in finding the limit of schedule 40, pressure rated PVC in sizes from 1" to 4". I believe this data will be helpful to anyone building a hybrid or high pressure...
- Wed Nov 12, 2008 12:32 am
- Forum: Hybrid Cannons
- Topic: Ignition past valve / Ignition by fuze
- Replies: 8
- Views: 2327
- Wed Nov 12, 2008 12:28 am
- Forum: Hybrid Cannons
- Topic: Hybrid Hydrogen Fuel Canisters
- Replies: 10
- Views: 2366
You will also get spontaneous detonations of your fuel canisters, because in order to fill your much larger chamber to 12x, you will need to have the fuel canister at 120x at the least. Do not attempt this. No no, I wouldn't do that. I want to use a 6-12X charge mix to fill a 1X (atmospheric) chamb...
- Tue Nov 11, 2008 7:38 pm
- Forum: Hybrid Cannons
- Topic: HYBRID FUELING 101
- Replies: 106
- Views: 297178
uhmmm yes you did.... 1x mix is a 'proper' mix of air and propane at atmospheric pressure 2x mix is a mix of air&propane at 2atm and so on Yes, that's why I called it a nominal 1X mix. It is 0.62 PSI above a true 1X mix, but it makes it easier to do the calculations. A my starting nominal 1X actual...
- Tue Nov 11, 2008 6:42 pm
- Forum: Hybrid Cannons
- Topic: Ignition past valve / Ignition by fuze
- Replies: 8
- Views: 2327
What's wrong with any of the numerous methods that use electrical energy to ignite the mixture? Nothing, I'm just having fun. We'll see if I ever get something like this off the ground. DIY told me that a 2X propane/air mix will get me a maximum of 250 PSI for a short time and then the pressure wou...
- Tue Nov 11, 2008 6:35 pm
- Forum: Hybrid Cannons
- Topic: Hybrid Hydrogen Fuel Canisters
- Replies: 10
- Views: 2366
Hybrid Hydrogen Fuel Canisters
In my quest for an ever simpler means of construction, I thought it might be fun to try hydrogen/oxygen, created from the electrolysis of water. I would be using this mix to fill my charges (same charge as seen here: http://www.spudfiles.com/forums/files/fueling_system_1_162.png except I would not b...
- Tue Nov 11, 2008 6:18 pm
- Forum: Hybrid Cannons
- Topic: HYBRID FUELING 101
- Replies: 106
- Views: 297178
OK, I believe I have a recipe for filling a hybrid combustion tank in my head. It is: 1. Decide on what --X (compression ratio) you want to end up with. 2. Assuming your chamber is filled with 14.7PSIa of air: 3. Raise the pressure of the chamber to 14.7 + 0.62 = 15.32 PSIa using propane. (I will co...