You can test this quite easily - it does work but its not as rapid as gas or wood fire:
Requires:
1. empty can (beans, soup etc)
2. half a can of sand
3. a spike to hole the can
4. a few stones for ground clearance
Method:
Remove the top of the can, spike some air holes in the side and base (in the base make only very small holes). Pour in the sand to half fill the can. Add 1/8 of a can of petrol evenly over the sand, leave it for a few mins to allow the petrol to spread out and dampen all the sand. Set can safely on stones to allow air way under the can. Light with a taper or burning stick.
Will boil a mug of water in approx 4 to 5 mins.
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