thank you sir. this is my first spud gun. the fuel is alcohol 70% + methylated spirit. but i have problem with attach the dot sight scope to my gun.

[youtube][/youtube]
thank you for watching

does my chamber is too long? so that's make not total combustion?

this is my chamber design : http://adf.ly/UfOoI

no i have not. i'm not yet get the fan. i'm still blow air from my mouth. sometimes i use cool pad for my laptop as the fan.

actually i mean not powerfull is, fuel in the chamber is not make total combustion. every i'm shoot marble it has rest. so this is the problem. i can shoot twice until three times on single fill chamber. hehe it make me confused. i'm put 2 igniter spark in my chamber. i'm put 2 igniter spark because...

yesterday i try it. but it still not powerfull sir

owh ok. thank you sir. yesterday i try to make fuel injection, but it's not powerfull. so you have idea for make injection fuel system?

thank you sir but i'm still confused about the function of chamber fan. is that for blow air from the outside chamber or make chamber temperature to be cold?

ok thank you sir. i will try it. but i'm still confused about the function of chamber fan. is that function for blow the air from outside chamber? or make the chamber to be cold temperature? hehe. sorry. it's my first time make spud gun.

thank you. but is this the problem? maybe i put the screw for igniter too far from fill port? or i make chamber too long then the barrel too short? i use methylated as my fuel

this my blog : http://www.marblespudgun.blogspot.com

[center][/center]i have some problem with my spud gun. if i'm not fill the chamber with much fuel it doesn't work. and sometimes the igniter spark doesn't work. can you help me to fix my problem? my chamber make from pvc pipe 1,5 diameter and 17 inch long. you can visit my blog and i hope you commen...