TM 1-1520-240-107-6-1SECTION VI. TAKEOFF7-6-1. Description.The takeoff chart, figure 7-6-1, defines distances re-quired to clear obstacles of 50 feet, 100 feet, 150 feet,and 200feet based upon maximum hover height capabil-ity and true airspeed. The procedure for takeoff is thelevel flight acceleration technique.NOTEThe maximum hover heights shown are indica-tive of helicopter performance capability and donot imply that this hover height must be main-tained through takeoff.7-6-2. Use of Chart.The primary use of the chart is illustrated by the exam-ples.a. To determine the distance required to clear anobstacle, it is necessary to know maximum hover height(hover capability), obstacle height, and climbout trueairspeed. Calculation of maximum hover height isdescribed in Section V, Hover. Enter the chart for therequired obstacle height, move right to desired trueclimbout airspeed, then down and read distance requiredto clear obstacle.b. A hover check should be made prior to takeoff toverify hover capability. If winds are present, hovercapability will be greater than predicted since the hoverchart is based on calm wind conditions.7-6-3. Conditions.a. The takeoff chart is based on calm windconditions. Since the surface wind velocity and directioncannot be accurately predicted, all takeoff planningshould be based on calm air conditions. Takeoff into thewind will improve takeoff performance.CAUTIONA tailwind during takeoff and climbout willincrease the distance for obstacle clearanceand may prevent a successful takeoff.b. Takeoff performance data are based on the useof maximum torque available at 100% RRPM.
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