jackssmirkingrevenge wrote:Nice... so we have a date set for the perforation of the stratosphere?
Next opportunity is mid-semester break in August-September. The Rugby World Cup is also being hosted in NZ at the same time so i'm not sure if we'll take a trip up to the bach. After that, semester end in November
Though I'm sure I can convince everyone to go up for a night or something in the mid-semester beak.
Now you've just demonstrate very clearly that when a canon do "click click" and not "BOOM", one must NOT look into the barrel to check why
Looking good indeed!!!
c) Yes, that is a girl who screamed
Yeah, right! Nobody believe you
No need for you friend to be ashamed about his high pitched voice. Some guys made their career with that... hum... feature... singing opera...
Next opportunity is mid-semester break in August-September
no rush... plenty of time to experiment some magic way to retrieve the shiny thing.
LeMaudit wrote:
No need for you friend to be ashamed about his high pitched voice. Some guys made their career with that... hum... feature... singing opera...
I'm going to be a whiny b**ch here and ask you to please avoid holding on to the barrel like that when firing the miniboy. With a blank shot it's not really a problem, but the pressure the barrel sees will be a lot higher with such a heavy projectile. Sorry, even though it's ABS I just don't think you have enough safety factor to be doing that.
Actually, I do share your concerns. I've never been 100% sure that I would fire it myself or remotely, it's just something that's been in the back of my mind. I'll have to think of a stand that can hold it in place, I guess.
The heaviest projectiles I have fired were about 100g in weight, MiniBoy will be 150g minimum. Considering the difference in recoil from firing a golf ball (45g) to a frozen lemon (100g), the step up to 150g is sure to be significant.
HGDT says 9,500J and 1100PSI barrel pressure for a 150g projectile compared to 1000PSI for a 100g projectile.
Edit: I'd also be worried about the end of the barrel failing after the barrel support, you can see how much it flexes just from a blank fire in the video.
Well Crowley, since the section your worried about the failure of is simply a cylinder, the fiberglass method is a reasonably good one. A thick, solid wrap will certainly protect your hands and reinforce the base of the barrel against rupture. You need not do the whole barrel, but adding a wrap in the area you hold would probably be worthwhile.
Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
MrCrowley wrote:Actually, I do share your concerns. I've never been 100% sure that I would fire it myself or remotely, it's just something that's been in the back of my mind. I'll have to think of a stand that can hold it in place, I guess.
Edit: I'd also be worried about the end of the barrel failing after the barrel support, you can see how much it flexes just from a blank fire in the video.
A few garage springs, maybe 10, and a nice welded steel frame to hold it up, and your good to go. The springs will simply be recoil absorbers, so you can fire it remotely and know that nothing will get damaged badly.
I'd say you'll want to add a layer at least 5mm thick near the chamber end. It probably isn't necessary to wrap the entire length of the barrel that thick, as the pressure is highest in the first couple feet. Wrapping the entire length would help reduce the flexing somewhat, though.
Depends on how much you want to spend on it.
Fiberglass, properly applied, should have a tensile strength of anywhere from 40-60 kpsi. That's in the same range as heat-treated aluminum.
Some cheap polyester resin will do as an adhesive.
edit... although I think you should at least brace the gun against something for the mini boy shot, mainly just to steady your aim and avoid the inevitable trigger flinch. I guess leaning it against your ATV would be enough.
