These may partly address that,why no Manufacturer to date has shown commercial interest in both the Civil and Military potential
Despite all the promise, the Rotodyne project came to an abrupt halt in 1962. Several factors contributed to its downfall. One of the most significant issues was noise; the air jets used to power the rotor during takeoff and landing were incredibly loud—too loud for urban areas. Since the whole point of the Rotodyne was to operate between city centers, the noise problem became a dealbreaker for many potential buyers.
But the talk never resulted in a regular service. Fairey was taken over by Westland in 1960 and continued the research, but there was a problem with noise from the jet tips on the rotor blades, which made it less practical to operate the Rotodyne in built-up areas.
Government monitors worked out that noise levels within 500ft from the pad during take-off and landing were "intolerable" and that those within 1,000ft (305m) of the Rotodyne in mid-flight were "unpleasantly noisy" - the same as hearing a raised voice from 2ft (60cm) away.
In 1958, Canadian company Okanagan Helicopters put in an order, but the Rotodyne was too loud for trips between Vancouver and the city of Victoria, 100km (62 miles) apart, and the service never started.
There were concerns that the helipad at Battersea, south London, which the Rotodyne was to use, was too far from the city centre. In March 1961, the New Scientist quoted one man as having taken less than half an hour to fly there by helicopter from Shoreham, West Sussex, but having taken another 35 minutes to get to his office in Regent Street by taxi.
Helipads could not be placed nearer business centres "for noise reasons or because of the high cost of land", the magazine said.