Originally Posted by
MightyGem
I know I shall get slated for this, but I never bothered about hoar frost on the blades, and can honestly say that I never noticed any effect.
Never did either, usually it is gone after the exhaust heat is recirculated on run-up. But then there are those pesky regulations:
§135.227 Icing conditions: Operating limitations.
(a) No pilot may take off an aircraft that has frost, ice, or snow adhering to any rotor blade, propeller, windshield, stabilizing or control surface; to a powerplant installation; or to an airspeed, altimeter, rate of climb, flight attitude instrument system, or wing, except that takeoffs may be made with frost under the wing in the area of the fuel tanks if authorized by the FAA.