Gyro design & why that direction???

[Choppie]

Hi all,

Just looking at the Member's Project section and Agent's thread on the LittleWings, I reminded myself of a question I had some time ago.

If one considers the design of the rotor, and as a given accept that the inner 1/3rd is not contributing to the lift in any significant way (perhaps even to the extent that it detracts from lift in negative flow situations), then why is it that the design almost exclude wingletts that can aid in lift characteristics? If one utilise this area of the rotor to add a stub wing / winglett of sorts wher it does not significantly impact on airflow through the disc, would that make any difference to lift?

I am quite intrigued by the wing design of the Savannah - STOL version that greatly contribute to the lift generated (aided by the fixed slat on the leading edge) - even at low speeds. If one could for instance build a flying stub around the centre of gravity and make use of a wing type such as that on the Savannah, would that not aid in lift and thus make for an even safer aircraft type?

Just a couple of things going through my very busy mind...