Airworthiness Objectives for Civil Powered Lift Aircraft: An account of some of the factors that need to be considered in the certification of aircraft using engine power as a direct source of lift Available to Purchase

THE types of powered lift aircraft which can be conceived are many and varied. Over the last 10 to 15 years a surprisingly large number of as have been tested on experimental machines, which have flown with varying degrees of success. The setbacks in terms of discarded or unproven concepts outweigh the successes in the form of erational types or of prototypes capable of commercial development; nevertheless, many valuable sons have been learnt. This evolutionary process has some way to go. The last few years have seen er new aircraft, but a proliferation of paper sibility studies, and their conclusions are as merous as their authors. However, at last a pattern beginning to emerge of the roles to be played by wered‐lift aircraft and the particular types which ty be best suited to fulfil them.