"How did you setup the power system? I see what looks like a Castle CC BEC Pro in there, which is what I was planning on using in mine for 12v power. Assuming your using the Castle for 12v power to the video transmitter, camera, etc, how are you…"

"can i use X8 PID, to starting tune my Phantom FPV Flying Wing EPO Airplane 1550mm?"

"Alexander, when I load your parameters the ground station changes from Arduplain to Arducopter settings????  really strange.  Im going to try other parameters."

"Ah I tried the wrong one, it was also for the X8 but that one didn't work for me I think it is for an older version of the software. I will try your this evening. Thanks a lot. Next weekend im going to do my first flight. I never flown a plane…"

"Did the one I posted not work for ya?"

"Can someone that achieves good results with the tuning in all weathers, send me the parameter file?"

"Yeah that would be good. That is pretty much my PhD lol. Propane ones are called Solid Oxide Fuel Cells (SOFC), and can run on any short chain hydrocarbon, and the hydrogen ones are Proton Exchange Membrane Fuel Cells (PEMFC)."

"Ah, so there are fuel cells that use propane directly. I didn't realize that. Wonder where I can score one… For sure, there will be batteries involved. We might design a complete power management system (I'm an EE by training) to…"

"Yes Horizon are an option but only on H2, which is a bugger to store and fuel tanks get big and heavy for very little fuel. H2 fuel cells degrade badly with time, but you can buy one now. Propane ones don't. Fuel cells have no moving parts,…"

"Sure, it's fuel, but it's not internal combustion, with all its attendant issues (weight, noise, vibration, need for a generator, etc.). Plus, the fuel cell is just cooler. Maybe we can put one (or more) of these Horizon Fuel…"

"...or take the weight penalty and put a small nitro/petrol generator onboard and make a hybrid? A hybrid will far outperform nitro or electric on its own."

"A fuel cell is fuel powered (stupid statement) which basically means the more fuel you carry the longer the endurance. Compared with nitro, petrol or lithium; propane is considerably lighter meaning you can carry more. 10hrs is based upon a small…"

"Simon, I wanted to talk to you about your fuel cell. We're planning a very long endurance flight, and were thinking we'd have to switch to gas. If you can do 10 hours with a fuel cell…we'd like to do 20."

"3.96 kg, if I recall correctly (including a 96 g GoPro HD 2 in the nose, required for CG as well :-) )."

"Thats awesome Rick. What's your all up weight?"

"We also had to put the batteries very far forward. We ended up with all the avionics in the back (except for the telemetry radio and airspeed sensor). We ran power cables pretty far. Didn't have any issues at all, although telemetry range…"