>Colin, >Just for reference my pushrod from control stick to bellcrank is also >T6-.058x.75. The one from bellcrank to elevator horns is T6-.035x1.5. >Like >I said, this is for reference only but it sure seems like you are in the >ball park. Dana Overall > > 5/8" diameter Tubing over a 67" span does not sound very ballpark to me. >The RV uses 1.5 " over nearly the same span. Lynn
Lynn and Colin, I just got back from my daily 5 mile run and was thinking about just this same issue (I have a lot of time to think when I'm not dodging traffic). My longest pushrod is 81.5". Although the wall thickness narrows to .035 the diameter increases from from .75 to 1.5 a twofold increase. Another thought while out running surfaced in that all short pushrods are narrow thick walled tubes while the two long pushrods form the the control arm to the aileron bellcranks are like the long elevator pushrod.......thinner walled, greater diameter. My non engineering thinking is you achieve greater integrity with more surface area with thinner walls for lack of a better way to describe it. What do engineering types have to say Dana Overall 1999 & 2000 National KR Gathering host Richmond, KY RV-7 slider/fuselage, Imron black, "Black Magic" Finish kit ordered!! Buying Instruments. Hangar flying my Dynon. http://rvflying.tripod.com do not archive _________________________________________________________________ Try MSN Messenger 6.0 with integrated webcam functionality! http://www.msnmessenger-download.com/tracking/reach_webcam
