losses of 5% in reciprocating engines are not uncommon in unusually ng 100% humidity RH. good rule of thumb for each 6 degrees below standard temperature one horsepower is produced than at standard temperature and conversely one orsepower is produced for each 6 degrees abode standard. engine is not running ambient pressure may be read on the MAP gauge. tuation where the engine power is set for takeoff, the air through the intake ving at high velocity, creating friction, and it encounter the bends and skin intake system. A typical intake system will loose 2-3 inches of ambient ake-Off RPM an full throttle. normally aspiratedreciprocating engines in general aviation are designed to inuous power with economical operations and long eng life below 75% ny cruise is defined as % power setting by most of today's ufacturers. MAP/RPM or power setting chosen by a charter pilot might be based on the of flight, if his customer was in a hurry or the most economical to save gas or even to choose a power setting that has less vibration and noise for the is pax's. n making power reductions in the engines that use MAP and RPM, it is ok to first then MAP. n making power increases in aircraft with MAP and RPM controls how do he power change? rae and internal stresses the pilot