AOSC Forum Archive

I've had plenty of questions about Big Bertha V2 since I redesigned my original, and I promised that eventually I would do some actual field tests under controlled circumstances. Well, after many months, I have.

I went to a friends property the other day and fired from a fixed position at measured angles of fire using a folding chair as my rest. All rounds were fired at 100PSI (+/-5) under the propolsion of a tire pump. Though I can run her off of any compressed air source that is schrader compatible, and usually use 12g CO2 cartridges for faster reload times, since I was testing and in no hurry I went with the $0 per round manual pump instead. The AoF was measured with a simple protractor and homemade plumb line, the PSI was measured by the gauge on the pump, and the distance of impact and landing were measured with a roll up tape measure. There was a ~3-5 MPH breeze that afternoon for which I had to make minor compensation. The lateral direction (aiming left or right) was simply eyeballed.

At a 50o AoF the range was exactly 400ft. This angle seems to be about the best range at that PSI. I fired 6 rnds in 3 minutes at this angle and pressure at a fixed target (2sqft) 400ft away to test the groupings. All 6 rnds landed within 25ft of the target, had it been a small building all but two of the rnds would have hit.

*pics coming...

I would like to see how you built this.  I might have to make one to fit in my Jeep.

Hit me up at a game and I will give you an overview, or I can build you one for $60.

I almost forgot, her longest clocked hangtime is a little over 9 seconds .

PICS

I have to go home now, but I will dig some up from previous games when I get a minute this week.

I thought maybe this was relivant to the golf club series. </3

I will be at Op.24.  A few of these in fixed positions at the blue hole would make for some interesting game mechanics.

Just a quick check pneumatics are the only allowed cannons of any sorts, right?

Yes.

not the best pic but anyways...

[img width=700 height=524]http://i771.photobucket.com/albums/xx35 ... 24/071.jpg[/img]

Dominum wrote: I almost forgot, her longest clocked hangtime is a little over 9 seconds .

Was this when we tested it at RedFox. I remember it having a ridiculous amount of hangtime.

Either there or at Saluda. Either way, it is quite an effective launcher, albeit not the prettiest one on the block.

Yeah, hangtime is 9 seconds, we usually do that at every Redfox game just for gits and shiggles. Someday I'd like to make an historically accurate version that actually resembles a real weapon, but until then I'm going for effectiveness, durability, and low cost. No need for anything fancy seeing as there's only good reason to field it about twice a year.