Brobdingnagian Bertha

Just build a cannon and want to show it off? Post it in here.

Postby Zorrowannabe9 » Sun Jan 07, 2007 8:43 pm

<b><FONT SIZE=4>Brobdingnagian Bertha</b></font>
<b>De$cription</b> - This is a quite large combustian cannon constructed from an 8 foot long piece of 6" Fiberglass Steam pipe. I wrote many of the details of the build in <a href="http://localhost/forums/viewtopic.php?t=15381">This Thread</a> but if you still have any questions feel free to ask! I have only tested the cannon far enough to see if it would fire, it does. I have not yet fired the coffee can or pot, both will be done when I have more space available than my backyard can offer.

<b>Combustion Chamber</b> - 39" x 6"
<b>Barrel</b> - 54" x 6"
*approx ratio is .72:1
<b>Ignition</b> - BBQ ignitor producing a single spark towards the rear of the chamber.
<b>Primary Fuel</b> - Metered propane, there is a 53" piece of 3/8" PVC tubing. It takes 15 shots with this meter to fuel the chamber.
<b>Ammunition?</b> So what fits in a 6" diameter pipe? Plant pots. And old Large Yuben coffee cans...8)

<center>
<a href="http://img224.imageshack.us/my.php?image=img0635eb9.gif" target="_blank"><img src="http://img224.imageshack.us/img224/7113/img0635eb9.th.gif" border="0" alt="" /></a>
<i>full cannon shot

<a href="http://img167.imageshack.us/my.php?image=img0637hv5.gif" target="_blank"><img src="http://img167.imageshack.us/img167/2203/img0637hv5.th.gif" border="0" alt="" /></a>
propane meter

<a href="http://img132.imageshack.us/my.php?image=img0636ym3.gif" target="_blank"><img src="http://img132.imageshack.us/img132/1287/img0636ym3.th.gif" border="0" alt="" /></a>
projectile stopper

<a href="http://img132.imageshack.us/my.php?image=img0638ty7.gif" target="_blank"><img src="http://img132.imageshack.us/img132/1880/img0638ty7.th.gif" border="0" alt="" /></a>
flower pot

<a href="http://img411.imageshack.us/my.php?image=img0641ew2.gif" target="_blank"><img src="http://img411.imageshack.us/img411/990/img0641ew2.th.gif" border="0" alt="" /></a>
holy coffee can batman!
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Postby markfh11q » Sun Jan 07, 2007 8:55 pm

Neat! How many propane canisters have you gone through yet?[:p]
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Postby Zorrowannabe9 » Sun Jan 07, 2007 8:57 pm

haha, still on the first...But Ill let ya know how many shots I get per canister haha
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Postby spuzi14 » Sun Jan 07, 2007 9:57 pm

What kind of hang time do you get?
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Postby Zorrowannabe9 » Sun Jan 07, 2007 10:42 pm

Ive only shot a dry towel...which didnt go far at all since it opens up after only 8 feet or so. When I get a chance to do soem more serious testing Ill post the results.
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Postby SkweezMyCheez » Wed Jan 10, 2007 9:52 pm

hmm, nomination for the POWER CLASS perhaps?
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Postby spuzi14 » Wed Jan 10, 2007 10:05 pm

I'll decide after I hear some hangtime specs.

Could you try to shoot some type of fruit or veggie so it makes a BIG splat?
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Postby Zorrowannabe9 » Thu Jan 11, 2007 12:23 am

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by spuzi14
[br]
Could you try to shoot some type of fruit or veggie so it makes a BIG splat?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

lol, hmmm. Sound like fun

Anywho, thank you for the nomination for mega (I assume thats what you meant) class. I appologise I havnt done much testing, I just dont have the space.:(
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Postby Zorrowannabe9 » Mon Jan 15, 2007 1:51 pm

Well a couple days back I dared to take a good shot with my cannon to try and get hang time estimate for you Spuzi. I filled the can with roughly an inch of gravel and sand and epoxied the lid on. It shot up through my large sycamore tree in my backyard (clearing a path through the branches/twigs as it went.) The hang time was more then 6 secs, but definetly less then 10. I know its a rough estimate, I was concerning myself with my neighbors freaking out (one fo thm thought her car had exploded...) I managed to count to 6 secs before it hit, but I then redirected my attention to my neighbor in her backyard.
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Postby Zorrowannabe9 » Mon Feb 19, 2007 11:59 pm

Well the Edit button appears to be broken. Well over this three-day weekend, I was able to shoot my cannon. It works quite well. So here are some videos ad a picture from that trip. Average hang time was around 7-8secs. Most of the videos are of quite lean mixtures, I didn't really get the mixture right until after we were done filming. The max hangtime that I counted was roughly 10seconds (I counted to 12 but I highly doubt that I can correctly count seconds.)

<a href="http://img96.imageshack.us/my.php?image=img0400uj8.jpg" target="_blank"><img src="http://img96.imageshack.us/img96/4773/img0400uj8.th.jpg" border="0" alt="" /></a>

<a href="http://s92.photobucket.com/albums/l16/Zorrowannabe42/?action=view¤t=MVI_0399.flv">Rolling...1</a>
<a href="http://s92.photobucket.com/albums/l16/Zorrowannabe42/?action=view¤t=MVI_0398.flv">Rolling...2</a>

Added 2/20: 3 more videos which were taken from my camera phone. The first one is with me, the second two are of my cousin ("HI" on the forums.)
<a href="http://www.youtube.com/watch?v=8ti4_cfH2q"0>Camera Phone 1</a>
<a href="http://www.youtube.com/watch?v=aDce1aS0GC0">Camera Phone 2</a>
<a href="http://www.youtube.com/watch?v=H3PbPak0iwE">Camera Phone 3</a>
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