Hi folks I went to a full push rod system partly because of the issues under discussion but also for ease in future maintenance and simplicity in construction.
My aileron rods (left and right) and elevator rod (goes aft under the seat and rear spar - refer the archives) are all connected to brackets welded to the bottom of the stick. As the elevator is moved fore or aft from a neutral central cruise position there is a very slight bias applied equally to both aileron rods; they both pull inwards in about 1/16". This acts to minutely raise both ailerons thus theoretically affecting pitch but the aerodynamic result is so small that it is not noticeable given the sensitivity of the elevator in affecting pitch stability anyway. Similiarly, movement of stick sideways to induce roll also pulls on the elevator rod which acts to raise the elevator. This impact is also negligible given the length of the rod and you instinctively allow for it by default in moving the stick fore or aft anyway. The rod end bearings have sufficient axial freedom in the bearing sleeves to allow for any off centre forces. In the RR system the aileron cable system must tighten throughout when the stick is moved away from central because it is closed by the follow through cable. Similiarly the elevator cables must tighten when the stick is moved sideways for the ailerons as well as bindng on the pulleys behind the rear spar. I have had to replace both my airspeed indicator and altimeter (the cheap Chinese jobs but nearly new) with better quality instruments because the former was erratically under reading by 12 knots and the latter would not hold the Kollsman calibration despite internal adjustment on three occasions. I understand an AD has been issued in relation to the latter so it seems to be a generic problem. Beware!! John and Janet Martindale 29 Jane Circuit TOORMINA NSW 2452 AUSTRALIA ph: 61 2 6658 4767 email: [email protected] -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mylist.net/private/krnet/attachments/20030531/99222110/attachment.htm
