Leif
Elite Veteran
Location: Oxford, PA - USA
| I don't have a definitive answer, but I do have a theory based on past work experience with high-pressure liquid chromatography.
I suspect that you have bubbles in the fuel stream. These bubbles collect on surfaces and in sharp corners of the internal geometry of the fuel system until they are either shaken free or are swept through the flowpath by a high flow of fuel.
When you start the engine, you are running with a very low fuel flow. The bubbles are not swept through the system until you go to high throttle (or until you shake them loose). I suspect that the bubbles are shaken loose as you carry the heli to the flightline. Putting the heli down stops the remaining bubbles from shaking loose, so the engine recovers.
When I say "bubble", I'm not referring to large visible blobs of air, but rather a vast number of "micro-bubbles". Think about the sides of a clear container after you just filled it from a tap and you'll get what I mean.
I personally have found that my heli conks out much more frequently after starting since I installed the CarbSmart. This is because the CarbSmart has the engine at the most lean position when it is cold, making the presence of bubbles have a greater impact on the engine than a fixed mixture setting.
Just a theory, but I think this is what's happening.
Leif |
