Hi, OK I actually have a couple questions. #1 What exactly does the 2x 3x 4x mix stuff for hybrids mean? Is it how many times more fuel AND air, and how do you figure out the air pressure for the fuel ratios. Its not that I'm building one but I'd just like to know what it means. #2 When you pressuri...

I knew about the meter, I'm going to use that fuel calculator, but I have to actually build the chamber or dry fit it and get my CV, but I'm not sure whether I'm gunna use brass or galvanized pipe and fittings, I don't really want to use copper unless I really have to because I don't wanna have to a...

I would like to know if anyone has ever used or heard of using a schrader valve setup to fill the metering pipe of a propane injected combustion. I was wondering if this would work because I wanted to do this as the cannon I want to build is rather small and I don't want to have to have the tank att...

OK, I had to try this out. I slightly modded my mini by replacing the .177 caliber barrel and adding a 36" .40 caliber blowgun barrel. To my surprise not only did it launch the needle dart incredibly well, it buried it 3/4" into SOLID pine from about 5 feet. I was amazed as I can barely get one to g...

Actually the bottle I used was from a hair dye kit, Revlon to be exact $3-$4, you can either actually use the kit up and save the bottle or find one in the trash like I did. If I see a small bottle that I can put to use, I keep it. I collect chemicals and things from different suppliers online that ...

Hey I figured I'd post a pic of it firing, not much but you get the idea, i was able to pull of 5 consecutive shots, (3 good ones) without venting b4 the CaC2 was used up. Not too shabby i think!

How is hydrogen easier to make than acetylene when all I have to to is drop a tiny chunk of CaC2 into the chamber and add a few ml of water? I can get a few shots off b4 I need to add more because after it fires it seems to suck air back into the chamber from the barrel so theres no venting needed. ...

OK what do u mean 130% i'm not retarded. when i use the butane i barely let any in, and i always vent the chamber by blowing air thru the back out the barrel to get fresh air in, but on another note, i HAVE gotten it to fire very reliably with very small amounts of CaC2 (AKA Calcium Carbide) and wat...

HEY ALL, I have a question for someone experienced here, SORRY I'M A NOOB, but I wont be for long. Anyway I just got started with this spud gun thing and I figured I'd start small before I go BIG, So heres the question. I made a Mini-Combustion cannon as seen in attached pics, it is a prototype just...