ABS Pipe (Not sure if what i have is safe to use)

[FreakyShotGlass]

That is alot of money, try going to a different hardware store. I get mine from a place called GasWeld propane is AU$8 MAPP is AU$10.

[rna_duelers]

Yeh big hardwear chain stores jack up the price of there stuff my uncle buys his bottles of mapp in abox of 30 for about $2:50 each,it works out to be.I bought my propane bottle and torch head for $16 about a year ago but i saw a MAPP gas bottle and torch head for $80 in Bunnings.

[rust0r]

ok well holy shit!

i just put it together with the bbq sparker, drilled the holes etc, did a test fire and it seemed like it wasnt working at all, just heard the gases wheezing out, then a few more reloads and "BOOM", much loud than i expected, and the potato is gone, i cant find it anywhere, i would imagine it disintegrated, i feel a great sense of accomplishment given that 1) it worked and 2) i still have all my limbs and facial hair!

i noticed after the first shot, that a little while later i clicked the sparker again, and it shot a flame out, is there anyway to prevent any after fires/shots like that, i would have assumed the first shot would use all the fuel? and as far as cleaning goes whats the best method?

thanks for all the help, my goal when i set out two days ago was to make it a fun, safe and rewarding project and i think ive met all my goals, well that and people think im insane for building one!