I started my 47 today in colder conditions than I usually do and the clutch woudnt accelerate the blades much over 60-100rpm (guess).
I didnt try dropping the throttle to let it fully engage as i thought the blades were turning too slow to allow the engine to keep going with clutch engaged.
I did try increasing the engine rpm higher than normal just to try get the blades going faster but no noticeable effect.
I stopped the engine and tried again and it engaged the rotor normally and I had a perfectly normal flight.
Should I be worried? I know some operators who warm their 47 with a propane burner on a cold morning but I thought that was purely for warming the engine. Can the clutch become lazy with cold temperatures?
OOW