ORIGINAL: More HP
They say that's a big no-no... The two systems should have their own battery. Theoretically yes, one power source could run both at the same time, but in the interest of safety, ie. short circuits, interference, or whatever, they advise to run seperate batteries.
I don't see where it would cause a problem. I think I would try it. I'd just splice into the wires coming from the RX pack.
I see it a Potential Problem and that is why I asked if there is JITTER: - you see simple calculations
lead me to suspect that there is Switching Type of DC-DC convertor when Sullivan claims that that
operate on any battery until 12V. OK ... If for simplicity take the Battery voltage is 11.5V and then
substract 1.5 staying on the Glow plyg, the rest is 10V to be on the Sullivan. And then if the plug takes
something like 3.5A to get red than it looks Sullivan would dissipate about 35Watts, i.e. that needs
a heat sink and such thing is not seen on their photos. More importantly, if that is the case, then
1.5Vx3.5A=5.25W on the Glow Plug vs. 35W on Sullivan that makes 15% efficiency in the USE of
the Battery. Well, nobody does such bad job nowadays, people use DC-DC converters with at
least 85% efficiency like those in the Motor for Electric Flights. And they get that efficiency by
switching On/Off with some 5-100 kHz rate and there the Electrical Noise is generated and that
is why one has to take care to eliminate it like in the Electric flights such noise is nicely supressed
for all Brush or Brushless motors Controllers which are similar kind of DC-DC converter.
Most likely Sullivan has taken good care for this but due to the other reasons, like battery exhaustion
your Radio would "die" while the engine might still run ...