Page 19 of 22
Posted: Sat Oct 03, 2009 6:47 am
by Brian the brain
I think it was "Powerlabs" that fired a golfball at mach 3 using guncotton..
whether the golf balls are going to deform horribly under pressure and jam in the barrel
.
It cleared the barrel, that's for sure..
I would very much like to get the moose pics through pm..as well as some specs about velocity, projectile and such...
just to compare..
Posted: Sat Oct 03, 2009 6:59 am
by inonickname
It's around a 0.2:1 C:B, so tiny.
In all honesty I hate this thread being kicked up, seeing this reminds me I should be building something. I've promised I will after I go pick up the mill slide for my lathe on Monday.
Posted: Sat Oct 03, 2009 11:34 am
by Reactor4
yea my bad guys. I wasnt really paying attention so i just brought it up cuz i didn't feel like reading 18 pages of comments.
Posted: Sat Oct 03, 2009 12:10 pm
by jackssmirkingrevenge
Brian the brain wrote:I think it was "Powerlabs" that fired a golfball at mach 3 using guncotton...
Mach 2 
Posted: Sat Oct 03, 2009 1:20 pm
by Ragnarok
jackssmirkingrevenge wrote:Mach 2
Went reading, and found this...
Sam Barros wrote:The golf ball then must have had a kinetic energy in the 13000J range, and flown over 10kM (6mi+) horizontally
Like hell it did. Even for that muzzle velocity, half a mile is about the limit for a golf ball.
Posted: Sat Oct 03, 2009 1:30 pm
by jackssmirkingrevenge
Ragnarok wrote:Like hell it did. Even for that muzzle velocity, half a mile is about the limit for a golf ball.
Agreed, even the streamlined, dense bullet from a 50 BMG round leaving the barrel at mach 3 can "only" manage about 7,500 yards.
Posted: Sat Oct 03, 2009 4:57 pm
by spud downunder
Hey, so does any one know what happened with the golfball barrel he made? did it work? is he still alive?
Posted: Tue Oct 06, 2009 5:26 pm
by Larda
inonickname wrote:Reactor4 wrote:
Damn. I've done machining before, but that is nice! Did you thread those yourself (on a lathe maybe?)
Please don't dig up old threads. It tends to get people annoyed.
Every part was CNC machined by him on lathe or mill.
Actually its only a few parts that i did CNC machine, the lamps to hold the chamber.
I could have CNC machined everything but its a good traning to do it manually.
Posted: Tue Oct 06, 2009 5:33 pm
by Willdebeers
Your'e so lucky you've got a machine shop!...wait a second...so do I.
What kind of mill is that you got there? Seems very good.
Posted: Tue Oct 06, 2009 5:40 pm
by Larda
I did some shooting with the new barrel and it worked quite well, remember that the CB ratio is around 0.07 so its not very suited as a GB cannon.
I did shoot at some car doors and a 1/4" steel plate,
I am still missing some photos (on my brothers camera) but i can show you some of the results .
I did get just under 700m/s , slightly less then HGDT suggested.
[youtube][/youtube]
Did some test shoots with a relay rich air/propane mixture, it did work better then i thought but reduced the muzzle velocity significantly.
[youtube][/youtube]
Posted: Tue Oct 06, 2009 5:48 pm
by Reactor4
I could have CNC machined everything but its a good traning to do it manually
Yea I agree. I have lots of experience on CNC (solidworks
) and I can say it gives you more a sense of self accomplishment when you do your stuff manually.
Posted: Tue Oct 06, 2009 7:27 pm
by ramses
That is amazing. You need to make some darts for the 1.7" barrel.
It makes me kind of sad watching you destroy perfectly good raw materials, but I suppose you have enough of those laying around that it doesn't bother you.
what frame rate did you use on the high speed clips? 600fps from an ex-f1?
Posted: Tue Oct 06, 2009 10:11 pm
by jackssmirkingrevenge
New videos,
same reaction 
I really do have to build me one of these.
Posted: Tue Oct 06, 2009 10:36 pm
by rp181
But what would you epoxy?
Posted: Wed Oct 07, 2009 4:44 am
by psycix
Easy: take a pipe, take a dumpster. Hole in dumpster. Pipe in dumpster, through hole, fill dumpster with epoxy. Done.