Originally Posted by
Big Pistons Forever
- Mixture Set When would this not be full rich ?
every time I have taken off so far !!!
Fine at near sea level airports but with a Density Altitude of 5000 ft or higher ( eg 2500 ft ASL airport on a 32 deg C day) you should lean to highest RPM during a full power runup and leave the mixture there for takeoff..
I mean I have never taken off with mixture full rich. I fly from an airport at 5,500MSL. The procedure I have been shown is lean to lean until I see RPM drop, then rich a smidge.
Carb heat is another area that I don't feel I have a good grip on. I have been given some procedures, but I am not sure how to interpret what I see. eg, start of descent: carb heat out, flaps, carb heat in. That's just a few seconds of carb heat and I don't know what it can achieve I imagine that I am watching for a rise in RPM as opposed to the expected drop, as a warning of icing?