High Engine idle reqd in downlines
Why is high idling rpm required for engines in vertical downlines say of 1000 feet------At 1300 rpm or so which is just right for landing the rpm is too slow for extended vertical downlines and during pull-out from a manuever the engine wants to die.
Someone said that since the prop is turning with a very low load in downlines as the engine is no longer countering Gravity the carb/diaphragm pulls in more gas than the Combustion burns in every respective prop revolution causing flooding.This causes the engine to die.
While keeping a high idle for such conditions does solve the problem it accelarates the model.
Any further info would be highly appreciated.