voila pourquoi il faut se méfier du carbone

voila pourquoi il faut se méfier du carbone



vu sur facebook

voila ce qui est arrivé a un émetteur vidéo suite à un coursjus avec le châssis carbone de son multirotor ....

"We had a tech. support request a few days ago which really had us scratching our heads.A broken quad, a burned (literally!) transmitter, and some confusion as to what actually happened.

What we believe happened is interesting, and warrants a warning to anyone building multicopters using carbon fibre!.
So here's the scoop.... Carbon fibre conducts electricity, quite well. When a large current is passed through it, it likes to burn.
The metal can on our transmitters (and just about any other Tx on the market) is at ground potential (0v). If the carbon fibre frame is at anything other than ground potential, then there is a potential for a nasty short circuit, and a smoking quad.
It is easy to imagine how this would happen... all it would take is a silicone-coated battery wire to rub against the carbon frame and wear through the silicone (sharp carbon frames loooove to cut silicone!). Any piece of electronics with a grounded metal can then coming in contact with that frame, and your multicopter has a lovely black contrail
Even the heatshrink on the transmitter didn't help here, it looks like the Tx was strapped rigidly to the frame, and any vibration could have caused the sharp corners of the can to wear through the shrink.

So... in summary... if you are building carbon quads, take care!"

d'où le verbe "carboniser" !