LowNslow,. .. .Some or all of the Kamov coaxials mechanically switch the pedals when the craft enters autorotation.. ._____________. .. .RW-1,. .. .
"In 1930, Corradino d'Ascanio of Italy built a relatively successful coaxial helicopter, which flew under good control. His relatively large machine had two, two-bladed, counterrotating rotors. Following the work of de la Cierva, the blades had hinges that allowed for flapping and a feathering capability to change blade pitch. Control was achieved by using auxiliary wings or servo-tabs on the trailing edges of the blades, a concept that was later adopted by others, including Bleeker and Kaman in the United States." ~ from an <a href="http://www.flight100.org/history/helicopter.html" target="_blank">article</a> by Professor Gordon Leishman.. .. .Professor Celi, who is also at the University of Maryland, is working on advanced blade control, which I believe uses tabs.. .____________. .. .H-43,. .. .The are a couple of Kamovs in Western Canada, which are used for logging. One was/is based in Victoria. That's not too far from you.. . . . <small>[ 28 March 2002, 19:48: Message edited by: Dave Jackson ]</small>