Originally Posted by
Cat 1
There is a "new" and unique characteristic with he "barf" tank is that the pressure is slower to respond when tank is low so it can get "lean" on a throttle application too quick and gets rich on a quick pull back - but engine stays running though those.
Naw... that is neither new nor unique... My .50 heli allready did that extremely noticable even without the solenoid and fuel curve. It is why I had to resort to an RPM governor, that would keep the throttle a bit more open during the rich seconds at pullback, and keep the throttle a bit more tempered at the lean periods after giving it a handful. Governor coped with that effortlessly (but of course, in those conditions, the load was controlled by the pitch commands.
But my engines do that also, albeit barely noticable, when the tank is near empty. A bit more slowdown on both up- and down-throttle cures it.
Edit: Having seen your vid: take it a bit easy at a cold start, Chris... Mine needs about 1 minute @ 3500 RPM, before the heads even get to 65 deg C. Starting it and giving it full throttle within 10 or 15 seconds causes extremely large temperature differences.
But it most definitely flies excellent and has a beautiful sound!