help with bumper please
i am almost done building a 4inch piston with 3inch porting valve. the piston is a 3inch coulpler modded to fit very nicely inside of a 4inch pipe. i am still waiting to get my vent valve so i have not tested the valve yet. the vent valve will be HUGE compared to the standard for piston cannon providing aproxametly 4times the flow of a 3/4 inch sprinkler valve so i am expecting the piston to be MOVING! I was just wondering if my bumper is enough. it is a 3/4inch thick of this blue foam stuff that i think is used for around a houses foundation. here is a pic of the cannon
http://s696.photobucket.com/albums/vv32 ... 0_8210.jpg
http://s696.photobucket.com/albums/vv32 ... 0_8210.jpg
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- Specialist 2
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If its what I'm thinking it is, it should be fine. Best of luck can't wait till you test it.
If it is squishy, but not too soft to be pressed completely flat with a low force, then it will be okay.
-Yes.
-You would indeed have to make way for the pilot opening.
-You would indeed have to make way for the pilot opening.
- Gippeto
- First Sergeant 3
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Is this what you're thinking of using?
http://www.ujr.ca/EN/dow_sm.htm
Might work for the short term, but I think you'll have to keep changing it as it gets beat up.
For bumper material selection, I use a simple, "low tech" testing method.
I hit it with a hammer.
If the material survives, and returns to its original shape, I'll consider it useable.
Check your local dollar store for "viable" materials. (silicone bake ware, mouse pad, etc.)
http://www.ujr.ca/EN/dow_sm.htm
Might work for the short term, but I think you'll have to keep changing it as it gets beat up.
For bumper material selection, I use a simple, "low tech" testing method.
I hit it with a hammer.
If the material survives, and returns to its original shape, I'll consider it useable.
Check your local dollar store for "viable" materials. (silicone bake ware, mouse pad, etc.)
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
- Gippeto
- First Sergeant 3
- Posts: 2503
- Joined: Sat Jan 19, 2008 10:14 am
- Location: Soon to be socialist shit hole.
- Has thanked: 2 times
- Been thanked: 17 times
Gippeto wrote:Check your local dollar store for "viable" materials. (silicone bake ware, mouse pad, etc.)
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
Half of a nerf football.
mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
i found a good material for a bumper and it is this 3/4in thick wrist support that you are supposed to put infront of your keyboard. did the hammer test and it held up great. so once i get my new sealing face i will glue it onto the back of the piston
Last edited by c11man on Sat Mar 21, 2009 9:09 pm, edited 1 time in total.
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- Corporal 3
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Same stuff as mousepads. You owe gippeto some thank-yous.
Completed projects:
CA1 SMSS Basic Inline
CA3 PDAB Airburst Cannon
Current Project: Bolt action rifle (25x140mm + 1in shot)
CA1 SMSS Basic Inline
CA3 PDAB Airburst Cannon
Current Project: Bolt action rifle (25x140mm + 1in shot)
thanks gippeto 8)
it is like mouse pads except it is like 4~5 times thicker and a little stiffer and heavier. only thing is that it is not quite 4inches wide its more like 3 so i just glued a little strip on the sid so it is a full circle
it is like mouse pads except it is like 4~5 times thicker and a little stiffer and heavier. only thing is that it is not quite 4inches wide its more like 3 so i just glued a little strip on the sid so it is a full circle