| Author |
Message
|
| Mafia_Mike1321 |
 Posted: 08/20/2006 1:55 AM Post subject: newbie here |
 |
|
Private
Joined: 20 Aug 2006
Posts: 4
18.69 Spud Bux
|
| well so im trying to make my first combustion cannon.... im was messing around with some extra PVC i had lying around and i bought a grill starter....i have a 4 ft long 1.5 inch wide pipe and a cap on one end that u can screw on and off and i installed the grill started about 2 inches away from the screw cap...i loaded in a wad of cloth leaving about a foot left for a "combustion chamber" .. spritzed in 2 sprays of model nitro fuel (screwed the cap on) and when i fire it, it kinda goes FLOOMP and it onyl travels halfway down the barrel....so what am i doing wrong? i mean u guys are hurking these things a hundred yards lol dont flame me im new to this stuff |
|
| Back to top |
|
 |
|
|
|
| VEGEMITEMODDER |
| Posted: 08/20/2006 2:00 AM Post subject: |
|
|
Corporal
Joined: 06 Aug 2006
Posts: 69
72.80 Spud Bux
|
Have you tryed somthing like hairsprary of engine starter (eather)?
welcome to the forums |
|
| Back to top |
|
|
| Mafia_Mike1321 |
| Posted: 08/20/2006 2:17 AM Post subject: |
|
|
Private
Joined: 20 Aug 2006
Posts: 4
18.69 Spud Bux
|
| nitro fuel is MUCH more powerful than hairspray, its 15% model nitro from my hobby shop.......i was wondering, does it just need a better seal from the ammo to build up more pressure? |
|
| Back to top |
|
|
| VEGEMITEMODDER |
| Posted: 08/20/2006 2:27 AM Post subject: |
|
|
Corporal
Joined: 06 Aug 2006
Posts: 69
72.80 Spud Bux
|
yes a tighter fit would help but not to tight
maybe you can just try hairspray or somthing like it just to see how it goes? or a chamber fan maybe |
|
| Back to top |
|
|
| Mafia_Mike1321 |
| Posted: 08/20/2006 2:40 AM Post subject: |
|
|
Private
Joined: 20 Aug 2006
Posts: 4
18.69 Spud Bux
|
| i actually did try hairspray and axe and the nitro lights better out of the three, and what is this about a chamber fan? ive heard about it but i'd liek to know more |
|
| Back to top |
|
|
| jeracoo |
| Posted: 08/20/2006 4:48 AM Post subject: Dude wft |
|
|
Private
Joined: 20 Aug 2006
Posts: 3
11.20 Spud Bux
|
If you can't get it started on 15% nitro just build a simple pnemutatic all you need is a tubeless tire valve a .5 inch to 2 inch pipe one end cap a ball valve either plastic or metal and you can launch things preety far, its really easy.
I just use mortein to fire my combustion it works great mines 2 inch
Good luck with your current and furture projects |
|
| Back to top |
|
|
| killagorrila99 |
| Posted: 08/20/2006 4:55 AM Post subject: |
|
|
Captain Obvious
Joined: 25 Jul 2006
Posts: 1103
152.60 Spud Bux
|
why dont u use oxy-aceteline? lol  anyway if u use potatoes it will work much better! |
|
| Back to top |
|
|
| rna_duelers |
| Posted: 08/20/2006 5:37 AM Post subject: |
|
|
Major General
Joined: 26 Sep 2005
Posts: 1641
3118.23 Spud Bux
|
| Well if u have it from about 1' from the bottom the camber to barrel ratio is at 1:3,try having the rojectile about half way down because any combuston cannon with a 1:3 C:B ratio isnt going to shoot very well at all. |
|
| Back to top |
|
|
| markfh11q |
| Posted: 08/20/2006 6:56 AM Post subject: |
|
|
Magic Dust Man
Joined: 06 May 2006
Posts: 1387
273.60 Spud Bux
|
Leave more of a "combustion chamber", and find a tight fitting projectile.
And when it does work, don't expect too much distance because you'll only be shooting out of a ~2' barrel. |
|
| Back to top |
|
|
| Mafia_Mike1321 |
| Posted: 08/20/2006 20:37 PM Post subject: |
|
|
Private
Joined: 20 Aug 2006
Posts: 4
18.69 Spud Bux
|
| well ok one thing i discovered while i was tinkering with it was the fact that i just need to make a combustion chamber lol .... i cut the barrel down so that it was about 2.5 ft long and i just put in some wadding in the tip really tight....when it fired it actually threw the wadding about 15 ft or so and there was a loud crack from the air escaping...my next hardware store trip will be to get a reducer down to 1 inch so that my 1.5 inche chamber will work with it...hope it will work ive just been messing with it a bunch to try and make it work.....when i get some money saved up im going to make a proper cannon with a 3" x 2' chamber with a 2" x 4' barrel....... another question i have: is there another alternative to getting one of those caps you can screw on? cus on the cannon i tried making, i can hear lots of air wooshing out from there and i cant tighten it anymore by hand....oh yea and with my very first config. i found a propane bottle in the barn and i tried it and i got the same result, floomp and about halfway down the barrel....that or i hear air rushing out from where the cap is |
|
| Back to top |
|
|
| chosen_way |
| Posted: 08/21/2006 4:04 AM Post subject: |
|
|
Staff Sergeant
Joined: 02 Jul 2006
Posts: 106
71.82 Spud Bux
|
| go pneumatic, tons more accurate and alot more fun to shoot and you wont have any flames coming out that could burn you. |
|
| Back to top |
|
|
| jeracoo |
| Posted: 08/27/2006 4:30 AM Post subject: |
|
|
Private
Joined: 20 Aug 2006
Posts: 3
11.20 Spud Bux
|
| hey i already suggested that air is the way to go if your a newb |
|
| Back to top |
|
|
| Benny |
| Posted: 08/27/2006 4:37 AM Post subject: |
|
|
Brigadier General
Joined: 19 Apr 2006
Posts: 845
144.97 Spud Bux
|
| Quote: | | hey i already suggested that air is the way to go if your a newb |
Hey, he was just backing up your comment.
And mark, try less fuel. |
|
| Back to top |
|
|
| Shrimphead |
| Posted: 08/28/2006 16:40 PM Post subject: |
|
|
Colonel
Joined: 17 Nov 2005
Posts: 514
667.65 Spud Bux
|
| Ya, you may be putting too much fuel in, which creates a less powerful explosion. |
|
| Back to top |
|
|
| noname |
| Posted: 08/28/2006 16:45 PM Post subject: |
|
|
Mr Vortex
Joined: 10 Apr 2006
Posts: 2509
2698.56 Spud Bux
|
| You can put a ball valve on the back, always seals, easy to refuel. |
|
| Back to top |
|
|
|
|
