Taxi C130
Aerobat77. As Tmbstory says, later C130's have a low speed ground idle function, predominately to help control taxi speed and save using either reverse or braking to keep the taxi speed low. Esssentially, the T56 engine operates within a very narrow RPM band, indicated in % RPM. 100% is 13820 RPM and via a 13.54 reduction ratio gearbox gives a prop RPM of 1021 at 100%. Ground operating limits are as follows: Low Speed Ground Idle 69-75.5%, Normal Ground Idle 94-102%, Max Reverse 96-106% and Normal Flight Idle 94.5-100.5%. Propeller Blade Angle at throttle positions below Flight Idle is controlled by throttle position. In the Flight Range RPM is contolled to 98-102% by the Propeller. The only limitation regarding throttle movement is to not move from Flight Idle Position to Full Throttle in less than 1 Second. Power output and RPM increase is absorbed by increasing blade angle. The propeller is fully feathering as well as fully reversible. Hope this is helpful and answers your question. Cant help with any first hand on info post "H" models.
Last edited by Old Fella; 9th Dec 2010 at 09:08.