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“Helicopters can have several different types of rotor configurations. These include tandem, coaxial, transverse, or intermeshing.”

Rotorcraft
Chapter Requirements Cost Food Time XP Gain Descripition
1 Library level 11 + Elite Paratroopers 2,100,000 16h 1,475 +10% Attack Helicopters hitpoints
2 4,200,000 4d 3,950 +10% Attack Helicopters damage
3 6,300,000 7d 5,370 +10% Attack Helicopters hitpoints
4 8,400,000 9d 6,165 +10% Attack Helicopters damage
5 10,500,000 13d 7,550 8x Attack Helicopters damage against defensive buildings
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