SJN, never go to PPM, stick to PCM...
@ Yann: Arguments please!
This stops the forward flight path very very quickly so preventing the model going of into the distance/ crowd.
For safety this is a very good argument. Although I rather see some backdoor way of even faster resuming control instead of controlling our heavy loaded kerosene bomb into what I don´t know....
.....so if you did not get control back PPM would not have returned control either.
Wrong, if PCM didn´t reacted at all there may be a slight chance that you could have had a jittering signal from PPM. Not ideal of course but maybe the last tiny bit to bring the model home or at least bring it to an area where it´s safe to plumb it into terrain, away from crowd.
Also flying PPM you won't have your engine automatically shut down or throttle back like PCM will.
As I mentioned before, most (If not all) turbine brand ECU´s have this function also incorporated.
The Reciever is constantly looking for a Signal so it can return out of Fail Safe.
It can, but most TX do this with a certain delay. With a 200+ mph aircraft this is naturally unacceptable....
I agree with Stig that the statistics do have the tendency to bend towards the PPM pro´s, although I also agree that you have to use the system where you have the most confidence with.
Thomas system looks interesting though.
Regards,
Gerald