Should be easy, try Vertical Air Technologies in Florida. The rotor system for their Hummingbird homebuilt (rebodied, actually) helicopter is all S-52 stuff. I asked them awhile back if they still had HO5S airframes and they said no. Thyey must have bought all the surplus (Sikorsky/DoD) dynamic components. 407 322-9488.
_________________ Remember the vets, the wonderful planes they flew and their sacrifices for a future many of them did not live to see. Note political free signature. I figure if you wanted my opinion on items unrelated to this forum, you'd ask for it.
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