Hiller Monster Chopper for Flightgear based on the aircraft described in Hiller Advanced Planning & Research Division Report No.65-5 Sent to NASA 01/05/1965
Notebook Calculations
Aircraft is referenced in article by Dwayne Day http://www.thespacereview.com/article/1045/1
Also known as the Hiller Air Tug https://www.youtube.com/watch?v=MHaxySnEPTc
Basic details
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6 Tip mounted Turbojets + 1 turboshaft in tail to power tail rotor
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3 rotors with diameter of 120m
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Empty weight 200,000kg
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Gross weight 453,000kg
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60 rpm (according to Jay Spensers book Vertical Challenge. The Hiller Aircraft Story from Jay P. Spenser. ISBN 0-295-97203-3 and also the Air Tug video)
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Circumference = 383.02m
so tips are 383m/s
sea level speed of sound is 344 m/s
Tips are supersonic...
http://wiki.flightgear.org/Howto:Make_an_aircraft
http://wiki.flightgear.org/Howto:Make_a_helicopter