Quote:
Originally Posted by Battle_axe
the FAA says for a lithium-ion or polymer fire there is only 2 effective methords Haylon or Class D fire extingishers, potentialy with enough heat sand could make it a whole lot bigger, however in a smaller fire sand may contain the fire long enough to burn out.
Water, Foam, CO2 are all a bad idea
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It's a question of energy. A receiver pack will effectively go phut and that's it. An RC main drive battery does all sorts of pyrotechnics as it can power a 300 watt motor. An F1 battery capable of delivering up to 35kW over less than seven seconds is just so much energy that the best way to extinguish it is to eliminate oxygen from the area - CO2 or Class D.
CO2 replaces the oxygen in the surrounding area of a lithium fire so cutting off its source of combustion. Class D extinguishers with copper base combine with lithium to form an alloy on the surface which acts as a barrier and prevents the oxygen reaching the 'raw' lithium.
As you say, we can use the sand as it cuts off the oxygen, but the cell does not have enough energy to burn through it. HTH
