Thanks how about pneumatic?? Do the same principle applies?

What is the best ratio of combustion cannon? I did some research on forum and some said 80% of chamber and 20% barrel? is there any differences between pneumatic and combustion ? Thanks

Maybe you should consider using airsoft barrel because they are made for accuracy and the less gap between the bullet and the barrel will enhance the velocity and the accuracy of the bullet. u can also install a system that most airsoft gun use. when the bullet is pushed from the barrel a hop up wil...

looks like that oxy-hydrogen can provide enough energy to rip off the bottle https://www.youtube.com/watch?v=cqjn3mup1So&list=FLYyLa8dlNRueL6yjdyufEHg&index=2 but im not sure will it be strong enough to blow BBs around 1 mentre or 2 metres since commerical firework fuse is prohibited in my city, so ...

This is my imagination of making airsoft grenade. since commerical frag are always expensive, although many recyclable grenade works but hard to find after used in outdoor. so here are my design of cheap and effective frag for single use. Do you guys have any experience with it? do you think it will...

This is used in Hong Kong SAR , I will return to HK next month for holiday and there is no firearm licence there. No way a citizen can accesses to gun in legal way. Even fire works in prohitbited in my city. however I might bring it to New Zealand next year but I gonna focus on my exam at the moment...

Its very strict here. Normal people can't possesses any firearm. And cannot even possess homemake smoke grenade that is make from sugar and KNO3. I rarely see any people use them in commercial airsoft field because its illegal. I really hate this I wish they give us more freedom. I am not sure how s...

jackssmirkingrevenge wrote:It can use both, go on file -> configuration to change the units

Got it thanks

If you're looking for something a little more advanced (and considerably more powerful) than hairspray though, I'd say it's hard to go wrong with metered propane, which is considerably safer and more practical than oxy-hydrogen. I will try use propane if I really get too less power with propane :mr...

What's your first language anyway? Its okay thanks, my first language is Cantonese, which is a bunches from Chinese. Mandarin is new language only 300 years old... mine is used in ancient. I study in oversea university so I can read decent english I could understand the link that u sent me but my g...

what value does GGDT use? Cm or inches?

sorry I might be wrong, I meant oxy-hydrogen. but thanks for your link now I know which fuel we use for rocket. But does the oxy-hydrogen works ? the one that extracted from water? someone say hydrogen release energy too fast will rip off the chamber that is make from pvc pipe

H2 o2 has more explosive power or hair spray? can you compress h2o2 with household item? what kind of fuel do you guys use?

A sprinkler valve would do the job. As to controlling the impulse, that's a bit trickier.

Where can I buy a sprinkler?? Will they fit in my 7 cm tube??

2. Should I add a smaller or bigger Qev with another so that I can choose to release more or less air ? I'm not sure what you mean by this. Thanks Ragnarok for so much detail explanation. I meant what kind of valve should I use. Should I just put 2 ball valves together a smaller one and a bigger? a...