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The paper describes improvements obtained in mechanical properties of low alloy steels as a result of vacuum melting. It gives tensile, impact and fatigue properties of vacuum melted 4340 and UHS 260 steels and compares them with those of air melted material.

The need for a short haul commercial air transport capable of vertical take-off and landing and having a high cruising speed has become quite evident in recent years. To achieve these requirements, a special type of aircraft had to be developed and it appears that the aircraft needed is the VTOL. This paper presents the reasons for selecting the Tilt-Wing VTOL over other types of VTOL's as being competitive in Commercial Air Transportation. A comparative study of the direct operating cost of a comparable helicopter and fixed wing aircraft with the VTOL is presented along with a comparison of block time and block speed. The operational aspects of the VTOL short haul transport are discussed and the advantages and disadvantages are presented for both commercial and military operations.

The purpose of this paper is to properly instruct the user of Epoxy Resin so as to avoid difficulties in constructing Die Aids, Checking Fixtures and Duplicate Body Die Models.