Originally Posted by
Arnie Madsen
.
Thank you
Frank also incorporates some Delta-3 angle in the main rotor.
Now I wonder if that offset pitch location is how he accomplishes it
Of course 2 blade tail rotors have Delta-3 to retain the plane of rotation and prevent flapping into the boom
but as far as I know he is the only one who does it on the main rotor as well.
Through the years my suspicious mind has pondered whether his unique Delta-3 combined with his unique coning hinges can create an unknown gremlin in certain conditions
I have often wished some researcher would mount the R system on a test stand and put it through every conceivable
motion to see if the blades would divert from their proper plane of rotation (not including Zero-G of course)
It would not require a lot of funding and if they used measuring instruments on all 3 hinge points could determine
if the coning hinges sometimes pivot beyond the design intentions.
Modeling and simulation of the design have been performed. The original GTRI modelling effort is documented here:
https://smartech.gatech.edu/handle/1853/52548
It's quite a large document. Chapter 5 is where the meat is, starting on PDF page 118 (not document page number).
There is also this, however I have not paid the $30 to download it and see if it is any good. It is quite recent:
https://vtol.org/store/product/mast-...tems-12593.cfm