Figure 19-6. Operations within the shaded area of a height/velocity diagram may not allow for a safe landing and are to be avoided. Figure 19-5. Takeoff performance chart. 19-3 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, 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. 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. Like helicopters, gyroplanes diagram that defines what speed and altitude combina- tions allow for a safe landing in the event of an engine failure. [Figure 19-6] which provide important information that may not be committed to memory. HEIGHT/VELOCITY DIAGRAM EMERGENCY SECTION Running Takeoff to 30 MPH & Climb out at 50 MPH CASGLYPH<.notdef> GLYPH<.notdef> Weight 1800 LBS Rotor Prerotated to 370 RPM  2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 Total Takeoff Distance to Clear 50 FT Obstacle in Feet (x 100) Pressure Altitude in Fe e t (x 1000) 1 2 3 4 5 6 7 8 TOTAL TAKEOFF DISTANCEGLYPH<.notdef> TO CLEAR 50 FT. OBSTACLE Zero Wind 0 F 20 F Std. Temp. 40 F 60 F 80 F 100 F HEIGHT vs.VELOCITYGLYPH<.notdef> FOR SAFE LANDING Avoid Continuous Operation InGLYPH<.notdef> Shaded Area. 0 20 40 60 80 100 Indicated Airspeed In MPH Height Above Runway In Feet 400 300 200 100 0