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Unread postPosted: Sun Jan 27, 2008 6:54 pm
Author: clide
Well I've had my hard drive on my laptop crap out on me, so apologies if I am a bit unresponsive in the next few days. I should hopefully be back up and running by Thursday.

Unread postPosted: Sun Jan 27, 2008 9:18 pm
Author: elitesniper
Well this is my Best Shot Competition entry, im firing a 30gram slug its mostly baby powder the actual pierceing came from the screaw driver i put insdie the slug along with the pvc coupling. Hope you guys like, *the effect of that slug was awsome*.
:wink:
http://www.youtube.com/watch?v=tN6eDWnHduI

Unread postPosted: Tue Jan 29, 2008 4:08 am
Author: mtronic
good shot man:) i really need to get a piston cannon happening :twisted:

Unread postPosted: Tue Jan 29, 2008 7:30 pm
Author: elitesniper
who me? if then thanks :lol:

Unread postPosted: Wed Jan 30, 2008 11:00 pm
Author: clide
Alright just reminding you guys that there is just a little over a day left. (1 day 2 hours from the time of this post)

Unread postPosted: Wed Jan 30, 2008 11:02 pm
Author: elitesniper
is this when the judging happens also?

Unread postPosted: Wed Jan 30, 2008 11:11 pm
Author: bigbob12345
I just had a look over all the videos and just realized that I stand absolutly no chance with the vid quality I have but it was fun to make it was kind of a special occasion so my dad let me pump it to 120psi at my house(lots of neighbors)and use "dangerous" ammo.Made a nice big noise
and caused my dad to get angry because it went through the peice of wood I was fireing at through the plywood backstop and made a nice big dent in my garage :lol:
Ill be curious to who wins my vote goes between DYI and mtronic
It was a good competition.

Unread postPosted: Thu Jan 31, 2008 3:26 am
Author: chartreusesnot
Here's mine, projectile is a golfball, target is a water filled milk jug.
http://www.youtube.com/watch?v=0VIIl_X6lys

Unread postPosted: Thu Jan 31, 2008 3:30 am
Author: MrCrowley
Very nice, catchy music. :)

Unread postPosted: Thu Jan 31, 2008 5:47 am
Author: Killjoy
Well my air compressor died on me, so I couldn't make any new videos of me shooting stuff. Instead I just grabbed an old video clip and fooled with it a little for like an hour.

So heres my contest entry. Its FEAR shooting 2 golfballs at a drum, kind of and old clip but the video is alright I guess, not really sure since it's like 4 am over here.


[youtube]http://www.youtube.com/watch?v=Y5taFPzDjOs[/youtube]

Unread postPosted: Thu Jan 31, 2008 6:04 am
Author: Novacastrian
As much as i love your very well constructed cannon and video i am still somewhat doubting your claim of 11000ftlbs, there is something that just aint right- evbec maybe.? :?

Unread postPosted: Thu Jan 31, 2008 7:18 am
Author: Ragnarok
@Nova: You reckon a hybrid cannon with a 50 ft barrel couldn't do that? It sounds a reasonable figure to me.

Unread postPosted: Thu Jan 31, 2008 7:30 am
Author: Novacastrian
Ragnarok wrote:@Nova: You reckon a hybrid cannon with a 50 ft barrel couldn't do that? It sounds a reasonable figure to me.

I know what you mean rag, but still.
I guess i have to "man up"! :? Damned egg cup small hybrid..
BTW, 50 ft barrel is way long.

Unread postPosted: Thu Jan 31, 2008 1:58 pm
Author: DYI
Killjoy, I hope you know that BLB f*cked something up when he was making EVBEC, and it resulted in the joules being correct, but the ft/lbs being more than the joules by the amount that they should have been less by. Hope that makes it clear as mud.

The velocity figures shouldn't be too far off, but considering that the original figures were with a 3/4" barrel, it may be a good idea to chrony FEAR, just to be sure.

Great video though.

I have no trouble believing energy like that from FEAR, considering that the SCTBDC can do 1/5 of that energy with the same projectile, and only has ~1/4 the barrel length, using roughly equivalent pressure but cool gases.

Unread postPosted: Thu Jan 31, 2008 2:19 pm
Author: Ragnarok
DYI wrote:The velocity figures shouldn't be too far off, but considering that the original figures were with a 3/4" barrel, it may be a good idea to chrony FEAR, just to be sure.

I believe he did. I may be wrong, but I thought the figures were chronograph confirmed.

If the GBs are doing 1900 fps... *calculation* ...they are 5560 ft-lbs each, so there are no EVBEC errors in there - it is a total of around 11,000 ft-lbs.

As for conversions, I use - for a good calculation, a ft-lb is 1.356 joules.
For a mental estimate, add a third from ft-lbs to Joules, take off a quarter in the other direction.