Lu,
this is a thread about intermeshing helicopters, so I'll promise to make this my only reply on the topic of R22 swashplate phasing.
You always compare a bell system to a Robinson and state that the bell is rigged so that forward cyclic causes forward swashplate tilt, but not so on the R22/44.
I could turn the tables and ask you to again look at both systems,
but this time, watch what happens when you manually raise a blade to simulate flapping.
On the bell rotor, the flapping has no affect on blade pitch, but on the R22/44, it will cause a pitch change.
Now, keeping this in mind, doesn't it make sense that the two rotor systems are rigged with different phase offset ?
Both helicopters will fly forward with forward stick, as has been attested to by many pilots.
When a forward stick input is made on the R22, this affects a cyclic pitch change, which in turn causes rotor flapping, which in turn pulls out pitch...
--an interaction that must be compensated for in the swashplate phasing in the R22, but not in the Bell.
Last edited by Chiplight; 1st May 2005 at 20:20.