3 ms·

I think the concern is more about the resultant chemical reaction of lithium: https://m.youtube.com/watch?v=gisdMQbtJqk https://m.youtube.com/watch?v=gisdMQbtJq

I think the concern is more about the resultant chemical reaction of lithium: https://m.youtube.com/watch?v=gisdMQbtJqk https://m.youtube.com/watch?v=gisdMQbtJqk than the total power of the pack. Also, larger hobby aircraft (e.g. A 700-size heli) will be using battery packs on the order of 2x packs of 6 cells ("6s" aka 6 3.7v cells in series @4000-5000+ mah), so it's more like ~200-300Wh. Again though, doesn't matter, because even something like a 3s pack @2200mah can make quite a scary fire. This is why there are barrels of salt water at RC flying fields. An overheating lipo goes in the tank before it melts everything with hell fire. Lipo fires are also why you can't take "hoverboards" on airplanes and why Amazon recalled them all: http://fusion.net/story/250086/airplane-hoverboard-ban-list/ http://fusion.net/story/250086/airplane-hoverboard-ban-list/ http://www.theverge.com/2016/1/21/10806816/amazon-hoverboards-refunds http://www.theverge.com/2016/1/21/10806816/amazon-hoverboard... Not sure how this is affected by being struck with a blade rotating at tens of thousands of RPMs at hundreds of miles per hour, but my point is that lipos are nasty beyond just their specific energy density :)

tim333 11y ago
The fire in the video looks kind of wimpy against a jet engine that burns a litre a second or so of jet fuel. The heat from the fuel is probably 1000x that from the battery
- SideburnsOfDoom 11y ago
  The problem though is that the violently combusting battery is also a chunk of metal that, after being struck by the blades, is going to be moving at high speed roughly at right angles to the expected airflow through the jet engine. Damage could ensue, that is not equivalent to bits of bird flesh and bone.
- Piskvorrr 11y ago
  The heat and flow in a jet engine is also carefully engineered and directed so that the flame front stays beyond a certain point in the combustion chamber. You don't want any of that in the compression stage, for example.

tim333 11y ago

The fire in the video looks kind of wimpy against a jet engine that burns a litre a second or so of jet fuel. The heat from the fuel is probably 1000x that from the battery

SideburnsOfDoom 11y ago
The problem though is that the violently combusting battery is also a chunk of metal that, after being struck by the blades, is going to be moving at high speed roughly at right angles to the expected airflow through the jet engine. Damage could ensue, that is not equivalent to bits of bird flesh and bone.
Piskvorrr 11y ago
The heat and flow in a jet engine is also carefully engineered and directed so that the flame front stays beyond a certain point in the combustion chamber. You don't want any of that in the compression stage, for example.