Mark Drela wrote: > "Someone else mentioned using hardened RDS torsion rods.
> This is not a solution, since hardening has little or > no effect on the stiffness of a metal. It only increases > its strength." Mark. . .As the maker of the hardened and tempered drive shafts for the RDS, I'm somewhat confused by your above comments and would appreciate clarification. It has been my practical experience as well as understanding that a heat treated or hardened piece if steel is certainly more rigid than the same steel in an annealed state. Please clarify how you distinguish between "stiffness" , "rigidity" and strength ? I found the Metalworking FAQ Compendium to have a good website on the subject. The URl is http://w3.uwyo.edu/~metal/heat.html Sincerely, Walt Dimick ***************************************************************** Have you checked out I.R.F. Machine Works' precision and heavy duty accessories for rotary flap and aileron drivers? The components for this totally clean and hidden system for moving control surfaces are now available premanufactured. Get the scoop for your next building project at our RDS web site: http://www.irfmachineworks.com/rds **I.R.F. also builds the Little Big Winch, a complete, personal launching system for RC sailplanes up to 3.5 meters. http://www.irfmachineworks.com/lbwinch ***************************************************************** RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
