Firewalling throttles
aerobat77, When moving the throttles up from Flight Idle it is not good practice to simply firewall them. Two primary reasons, one it is possible to overtemp the engine, despite it having an electronic fuel trimming function which above 64 degrees throttle angle, (known as cross-over) allows the Temperature Datum valve to "Take" fuel or "Put" fuel to control the temperature in relation to throtle position, this known as Temperature Controlling Range. Below Cross-over the TD valve is only able to "Take" fuel, this being Temperature Limiting range. In colder ambient conditions it is also easy to "Over-torque" the engine, the limiting value being 19600 "/lbs of torque. This is in fact an airframe limitation, the engine mounts being the limiting factor. There is a significant "Ram Rise" in torque as the aircraft accelerates, so setting take-off power is done without undue haste, especially when conducting a rolling take-off. Operating the C130H from McMurdo on the Ross Sea we reached the torque limit not too far above cross-over. Being essentially a constant speed engine there is no real need for rapid throttle movement as the engine does not need to "spool up" and response to throttle movement is pretty much instantaneous. A very good feature in an aircraft which is flown in a tactical role into some very ordinary airfields. I am unsure what the torque limit on post "H" models is, however it remained unchanged from the original C130A right through to the C130H.