Daedal said:
Has anyone thought of alcohol? :-?
It burns VERY slowly and for a very long time. It's HOT and will not blow out!
I've covered my hand with it once and lit it on fire... it won't burn your hand until the alcohol is depleted... KIDS... DON'T TRY THIS AT HOME!!! ;D
To turn it off, have a bucket of water handy, and be ready for the surface of the water to catch fire too... ;D ;D
Another option is Butane. A rigged lighter could burn for quite a while and wouldn't weigh much... but would generate a lot more heat than a candle
--DDL
A butane lighter that puts out enough heat to actually propel the balloon upward would have too big of a container, unless it was one of those small bullet ones or similar, but thats worth exploring.... I would think it would need to be mounted very well and it would be hard to rig it so that when it was depleted the remained fuel that comes with the balloon could take over.
The other "negative" thought is if it fell out, it would burn all the way down and most likely catch something on fire for sure since it burns so hot.
Alcohol on the other hand would be nice but has some of the same challenges as gasoline.... "weight".
I've thought of a paraffin block with several wicks so that there was enough heat to generate lift, but it would turn to liquid if not housed by something and then that adds weight again to the already heavy paraffin wax.
Some of these ideas would just have to be tried to know for sure.
I"m trying to think of something thats cheap "like you could pick up at an outdoors store, like GI Joes or some camping store".
We have to be careful or we will turn this 4.00 balloon into a 40.00 balloon!.... LOL!
You can buy Helium in compressed form if you want to cheat to to a balloon to "add" to the top to give the balloon more lift in spite of the weight of say a Sterno Cannister that may burn for like 30 minutes.
All you would have to do is find a rather large balloon and fill it with helium and tie a fishing string to it thats about 6 feet and put a pin hole through the top of the hot air balloon and put the string through and tie it to a small stick or something thats about one inch long to prevent from pulling through.
We don't have to stick with the purity of a hot air balloon, we can cheat!
We are looking for "effect".... that UFO look that keeps on giving!