Yup, it's on-board the FC :-) sorry for all the shakiness and everything, our camera mount is organic so lacks the rigidity of proper mounts X-p haha... i guess it's quite hard for my unfortunate co-driver to hold the camera while struggling to pray that he'll live through it... X-p
about the backfire... that my friend, is among the mysteries of the rotary legend... X-p some say it can even spit fires up to 10 feet high... X-p haha... just joking... :-p
I guess it's because how the nature of rotary combustion :-p just like how performance valve allows the exhaust valve to immediately open upon combustion (even when the fire has yet to die out) to allow the next cycle to start immediately, rotaries have an elongated (i guess that's the term for it :-P) combustion chamber, so the fire is i guess a lot bigger when it fills the chamber, and as the rotor pushes the combustion waste out the exhaust port, the fire has yet to fully die out (and hell no the rotor ain't going to wait for it to die out :-P) and thus runs out the back causing a lot of oohs and ahhs and the 4th of july... X-p
But that's what i think :-p i don't know whether that's true or not (or perhaps entirely bull X-p) perhaps the rotary gurus can help explain this phenomenon X-p all i know is that it is quite natural for rotaries to be spitting fire just because of the sheer fact that it's a rotary :-p i've even seen a clip where the dude did a bridge porting on his engine, and the fire coming out of the exhaust was like a machine gun X-p as in POW!! POW!! POW!!! something like the misfiring system :-p