Then comes the more powerful CH-47B with the Lycoming T55-L7C engine, which was introduced by Boeing after a production run of over 350 CH-47A`s. On the B model there are nonsymmetrical rotor blades to increase the stability. The CH-47B began to be produced in May of 1967 and eventually produced 108 B models before production shifted to the C model.

因此波音公司在推生产了350架CH-47A后，推出了更加强劲的配备莱克明T55-L7C发动机的CH-47B型。B型为提高稳定性，还配备了非对称性的旋翼桨叶。CH-47B于67年5月投产，在CH-47C型开始投产前共生产了180架。

The CH-47C has a improved center cargo hook whose capacity is 20,000 pounds. This center hook must be used when hooking a single load. The other two hooks, one at the fore and another at the aft, can carry 10,000 pounds each. Designed to meet an Army requirement to transport a 15,000 pound sling load over a 30 mile radius, the C model boasted an increased gross weight to 46,000 pounds, increased fuel capacity, the Lycoming T55-L11 engine developing 3750 shp, and addition structural improvements. The first CH-47C flew in late 1967. Production of it continued until 1980 with crash worthy fuel system and fiberglass rotor blades.

CH-47C装备了一个外挂能力9080千克的机身中央外挂钩。当挂吊单一样货物的时候必须使用这一挂钩。另两个分别在机身前部和后部的挂钩则各能挂载4540千克货物。为能满足陆军提出的载重6810千克时活动半径应达到54千米的要求，C型的最大重量达到了20884千克，载油量也大有提高。采用的莱克明T55-L11发动机功率达3750轴马力，机体结构也有改善。CH-47C于67年首飞，80年停产，后期采用了坠毁自封闭供油系统和玻璃纤维桨叶。

June 1976 contract for a modernized Chinook brought out the CH-47D, one of them in the photo down here. At that time the older variations almost came the end of useful life so they all needed to be replaced. Three aircrafts, one CH-47A, one CH-47B, and one CH-47C were rebuilt with improved systems to provide three CH-47D prototypes. The upgraded power plants, Allied Signal Engines T55-L-712 3,750 shp turboshaft engines, rotor transmissions, integral lubrication and cooling for the transmission systems, and fiberglass rotor blades make the CH-47D a brand bran-new CH-47.

1976年6月，先进支努干合同促生了CH-47D直升机(下图)。当时旧型号的CH-47的使用寿命已尽尾声，因此需要替代品。CH-47A、B、C型各一架，共三架飞机被装上改进后的系统，作为三架CH-47D的原型。改进包括改进了的联合信号发动机公司的T55-L-712 3750轴马力发动机、旋翼传动系统、传动系统整体润滑冷却和玻璃纤维桨叶。上述改进使得CH-47D成为了一种全新的CH-4

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