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Figure  7-8-1. Drag Chart
Figure  7-9-1.  Climb and Descent Chart

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM  1-1520-240-10            7-9-1 SECTION  IX.  CLIMB DESCENT 7-9-1.  Description. a.  Climb and descent performances may be seen in figure 7-9-1, which presents change in torque to climb or descend at selected GWs. b.  The climb performance charts, figure 7-9-2, shows relationships between GW, initial and final altitude and temperatures, time to climb, and distance covered and fuel  used  while  climbing.    The  chart  is  presented  for climbing at hotter and colder temperatures, intermediate torque (30 minute operation). 7-9-2.  Use of Charts. a. To determine torque change for a specified rate of climb or rate of descent (fig. 7-9-1), enter rate of climb or descent and move right to gross weight, move down and read torque change. This torque change must be added to the torque required for level flight for climb, or subtracted for descent, to obtain total climb or descent torque. b.  Rate of climb or descent may also be obtained by entering with a known torque change, moving upward to gross weight, moving left and reading rate of climb or descent. c. To use the climb performance charts (fig. 7-9-2), enter at the top left at the known gross weight, (for heli- copters with EAPS installed, enter chart at actual GW plus  1000  pounds),  move  right  to  the  initial  press  alt (pressure altitude), move down to the FAT at that altitude, and move left and record time, distance and fuel.  Enter again  at  the  GW,  move  right  to  the  final  altitude,  and move down to the FAT at that altitude, and move left and record time, distance, and fuel. Subtract the time, dis- tance, and fuel values of the initial altitude-temperature condition  from  those  of  the  final  altitude-temperature condition to find the time to climb, distance covered, and fuel used while climbing. 7-9-3.  Conditions. The  climb  and  descent  charts  are  based  on  100% RRPM.  The climb speed schedule shown in figure 7-9-2 (see insert) is for optimum climb, that is, minimum power required and maximum power available (30 minutes).  It is  an  average  schedule  for  the  GW  range  and  atmo- spheric conditions for the CH-47D.







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