2. The Abrams tank’s Honeywell AGT1500 engine is also used in Bell AH-1W SuperCobra, Boeing AH-64 Apache, Sikorsky UH-60 Black Hawk, AgustaWestland EH101/AW101 helicopters. This tank however presents some problems, due to the solution adopted for propulsion, namely the turbojet.
3. This type of engine does not start with a starter like any diesel engine, but with a small jet engine (APU). Only after the APU reaches idle speed does the air it compresses begin to spin the tank’s engine compressor to get it started.
4. Therefore, if for some reason the enemy surprises him with the engine of the tank stopped, it takes at least 5 minutes to restart it, during which the tank remains motionless. The turbojet has 2 axial shafts corresponding to the low pressure turbine on the one hand,
5. and to the high pressure turbine on the other. To operate at maximum speed, the speed of the 2 shafts must be increased to 15,000-20,000 rpm. To balance the speed of the 2 shafts and avoid the appearance of the phenomenon of pumping in the engine,
6. an electronic governor is installed. This regulator is also designed to protect the transmission of the tank from pressure shocks in the turbojet engine. In short, the 65-ton tank does not start and accelerate like a racing car, as the engine idle time is a maximum of 7 sec.
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