ok, sorry, i didnt realise that the manual is actually wrong. it seems that in the aircraft guide the coolant and oil temperature gauges are labeled back to front. the left gauge is actually coolant, not oil...sorry!
once i realised that it was the coolant overheating rather than oil, i opened the radiator and backed off on power.
whoops!
when i said fly at zero prop pitch i was talking about the H model with the variable pitch propellor, the C model is different.
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