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Haha, it's been few and far between... But I need something to distract me from my final high-school exams coming up in two days! :D I actually reached for that pen-gun to film the video, got to the sink and realised that it had mysteriously sprouted a schrader valve! I sat looking at it, thoroughly...

Some Pen-Gun fun! I built this one with a Presta valve, IMHO they're far more suited for use as a pilot than schraders. For starters, they lack a spring so the moment you break the seal, they 'pop' open. They are easily depressed with a thumb, and the integrated screw can function as a safety, allow...

That's true. And not trying to criticise, just found the mistake amusing haha.

Somehow I don't know if 4.5 kilos would be necessary, haha. This is more of a mini cupcake than a birthday cake. :D Also, just a thought... If one was pulled over when driving around with 4.5kg of KNO3, and the boys in blue decided to take a look through the car... What would happen? A bag of white ...

Zeus, out of curiosity... Why not water when aborting cake (Yes, that cake)? I know why water can't be used for oil fires, and I know cake fires can sustain underwater... but will water on cake have a negative effect as in an oil fire, or will it just be ineffective? I can't imagine a small amount o...

I will have no part of this project if food is served in-flight! It just seems to defeat the purity of the test, so I'm putting my foot down. Yeah, you'd better listen! Somehow I feel this won't be taken seriously... :D Funnily enough MrC, I still wouldn't feel comfortable with 120 psi in PVC... I'v...

Caution is always admirable, but how much cake exactly were you cooking? If you're only talking the amount that's going in the miniboy, you're unlikely to get enough flames to scorch the ceiling. Have you ever baked before? I believe the Mythbusters created a similar dessert which they overdid, that...

@saefroch,

I'd suspect the browning is simple caramelization, because as ramses noted, pure sugar behaves pretty much the same. Regardless though, I guess you've stomped all over my theory of 'no chemical reactions occuring'. Hmmph!

Well, I'm not sure if that will be enough dessicant, but if you've got one on hand chuck it in, it shouldn't hurt. Unless the flour is the more hygroscopic chemical, but I doubt that.

Yes, smells like candy. I disagree with saefroch in that there's much in the way of chemical reactions taking place... perhaps some localised vapourisation of the sugar, but you're really just melting the components together. Unless you reach the heat of decomposition of one of the ingrediants. I'm ...

I think he means something along the lines of 'guide the combustion products towards the barrel'. In that case, it's not really necessary... The gasses have no-where else to go so they have no option but to force the projectile from the barrel. Though I suppose removing any sharp transitions in diam...

I only purchased self-rasing flour once. It was a food-grade powder from a pharmacy, though I'm not sure why people take flour on its own. Regardless, I ended up wasting the last of mine. Threw it in a mate's fireplace to see how fast it would cook. Made a nice sparkly purple loaf, and ate through t...

Iron Chef would be so much more entertaining if all they cooked was cake.

Ha.... Oxyhydrogen ( 'HHO' ) more powerful than powder? If we're talking energy/volume, from memory even oxy/propane beats oxyhydrogen... Provided the gasses arn't compressed, I'm pretty certain any solid fuel has them both thouroughly beat (though admittedly I haven't done the math to back it up). ...