Search found 1679 matches
- Mon May 04, 2015 2:44 pm
- Forum: General How-To & Discussion
- Topic: Is spudding dead?
- Replies: 119
- Views: 293923
Re: Is spudding dead?
I don't think spudding is dead, but I can only speak for myself here. I've been busy at college for the past 4 years, and am now heading off to a PhD program. I'm trying to put together a little project for the college I'm leaving, so maybe that'll appear here. mobile does have a good point; I think...
- Fri Nov 30, 2012 10:21 pm
- Forum: Hybrid Cannons
- Topic: U Tube Manometer
- Replies: 8
- Views: 5031
- Fri Nov 30, 2012 12:13 am
- Forum: Off-Topic Hobbies
- Topic: "Offtopic-posts-topic" NSFW
- Replies: 6637
- Views: 1687513
- Thu Nov 29, 2012 11:47 pm
- Forum: Hybrid Cannons
- Topic: Trident Mk. II Build Log
- Replies: 131
- Views: 36259
Day 2 of machining, good progress. New pump completed, 3/8" diameter head, 12" stroke: http://img824.imageshack.us/img824/7107/newpump.jpg Sorry for the terrible picture quality, all I have at school is my cell phone. The weld is not mine. I've also discovered that if I ask nicely, the school will p...
- Wed Nov 28, 2012 10:41 pm
- Forum: General How-To & Discussion
- Topic: Short question topic
- Replies: 1503
- Views: 685945
- Wed Nov 28, 2012 8:54 pm
- Forum: General How-To & Discussion
- Topic: Short question topic
- Replies: 1503
- Views: 685945
- Wed Nov 28, 2012 8:26 pm
- Forum: General How-To & Discussion
- Topic: Short question topic
- Replies: 1503
- Views: 685945
At sufficiently high pressures, a failure will occur. Do some quick reading via wikipedia on shear stress/shear modulus and tensile stress/Young's modulus. There's also compressive stress/bulk modulus, but at the level most of us are at we don't bother considering it. If you're wondering if your spe...
- Wed Nov 28, 2012 4:31 pm
- Forum: Hybrid Cannons
- Topic: Trident Mk. II Build Log
- Replies: 131
- Views: 36259
- Wed Nov 28, 2012 10:16 am
- Forum: General How-To & Discussion
- Topic: GGDT/HGDT Request Thread
- Replies: 120
- Views: 270174
- Wed Nov 28, 2012 12:53 am
- Forum: General How-To & Discussion
- Topic: GGDT/HGDT Request Thread
- Replies: 120
- Views: 270174
- Wed Nov 28, 2012 12:20 am
- Forum: General How-To & Discussion
- Topic: GGDT/HGDT Request Thread
- Replies: 120
- Views: 270174
45 degree launch angle is not the optimal launch angle for a high-velocity golf ball. http://imageshack.us/a/img16/2678/build1.png http://imageshack.us/a/img138/107/build1ballistics.png http://imageshack.us/a/img189/8366/bulid2.png http://imageshack.us/a/img819/9530/build2ballistics.png Your golf ba...
- Tue Nov 27, 2012 10:42 pm
- Forum: Hybrid Cannons
- Topic: HGDT Max Bar Pres > Cham Pres
- Replies: 5
- Views: 4942
I recall previous discussion about there eventually being a 1-D version of HGDT, and issues with GGDT near-supersonic. Yeah, I wasn't asking if it was true to the real world, but if I hit upon a bug. I'll keep your caution in mind. I believe DYI ran some numbers for me a while ago that put the press...
- Tue Nov 27, 2012 9:52 pm
- Forum: Hybrid Cannons
- Topic: HGDT Max Bar Pres > Cham Pres
- Replies: 5
- Views: 4942
- Tue Nov 27, 2012 9:49 pm
- Forum: General How-To & Discussion
- Topic: why can't I get a better result when firing?
- Replies: 4
- Views: 3105
A neophyte! Welcome! You're looking for the section called "Combustion Cannon Discussion," in particular a sticky called How to Build a Propane Meter . To actually answer your question: No, using propane will be no more reproducible than other propellants if you're trying to gauge the mix by feel. Y...
- Tue Nov 27, 2012 7:52 pm
- Forum: Hybrid Cannons
- Topic: HGDT Max Bar Pres > Cham Pres
- Replies: 5
- Views: 4942
HGDT Max Bar Pres > Cham Pres
This is the hoped configuration for my current build. Why is the max barrel pressure much greater than the max chamber pressure?