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rotor prerotation speed of 370 r.p.m., and no wind. Variations from these conditions alter performance, possibly to the point of jeopardizing the successful out- come of the maneuver. 

## HEIGHT/VELOCITY DIAGRAM 

Like helicopters, gyroplanes have a height/velocity diagram that defines what speed and altitude combina- tions allow for a safe landing in the event of an engine failure. [Figure 19-6] 

During an engine-out landing, the cyclic flare is used to arrest the vertical velocity of the aircraft and most of the forward velocity On gyroplanes with a manual collec- tive control, increasing blade pitch just prior to touch- down can further reduce ground roll. T ypically , a gyroplane has a lower rotor disc loading than a helicop- ter which provides a slower rate of descent in autorota- tion. The power required to turn the main transmission, tail rotor transmission, and tail rotor also add to the higher descent rate of a helicopter in autorotation as compared with that of a gyroplane. 

## EMERGENCY SECTION 

Because in-flight emergencies may not allow enough time to reference the flight manual, the emergency sec- tion should be reviewed periodically to maintain familiarity with these procedures. Many aircraft also use placards and instrument markings in the cockpit, 

which provide important information that may not be committed to memory. 

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