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Additional resources for P-39 Airacobra in Detail Vol 63
For the same weight, the fiberglass laminate was more protective than steel or aluminum. The option was also available for providing considerably more protection at a similar weight. Remembering the demise of armor in the Middle Ages, the United States military opted for reduced weight and moderately improved protection. The Doron could be molded in shapes and sizes which could fit into a specially made nylon vest with pockets carefully designed to receive such plates while maintaining maximum articulation [36,37].
Contract No. 3 0 - F , US Army Natick R and D Command, Natick, MA, 1946. R. Cooke, US P a t . 3,509,833, 1970. L. R. Barron, P l a s t i c - C e r a m i c Composite Armor for Vietnam, Proc. of 23rd Annual Tech. Conf. , Soc. Plast. , Washington, DC, 1968, Sec. 3A, p. 1-12. S. H. Abbot, Mater. , 68 (1968) 42. G. Golden, Armor Systems Development/Evaluation Guideline, Tech. Memo. 18-69, Human Engineering Labs, Aberdeen Proving Ground, MD, 1969. H. B. Kulinski, Evaluation of US Air Force Survival/Armor Vest in US Army OH-58 Helicopters, Tech.
A limit penetration coefficient F is defined by F = MV50/Ae, where M is the cube mass in g, e is the equivalent plate thickness in cm, A is the cube face cross section in cm 2 , and V50 is the limit velocity in m/s. F. Single Cube Test The multiple cube test was abandoned in favor of the single cube test because of greater simplicity. M The cubes were individually mounted in plastic carriers as shown in Fig. 3 and fired from rifled guns. The plastic carrier provided for rotation and gas seal for the missile.