---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Wed 08/11/10: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:34 AM - control crossover () ________________________________ Message 1 _____________________________________ Time: 05:34:30 AM PST US From: Subject: KIS-List: control crossover 8/11/2010 Hello Rich, Thanks for your quick and detailed response. You wrote: 1) "What is the requirement OC?" I suppose that the contol stop requirement on an EAB (Experimental Amateur Built) airplane is whatever the kit provider or the aircraft builder decides it to be. If we look to 14 CFR Part 23 for type certificated airplanes for guidance here is what we find: "23.675 Stops. (a) Each control system must have stops that positively limit the range of motion of each movable aerodynamic surface controlled by the system. (b) Each stop must be located so that wear, slackness, or takeup adjustments will not adversely affect the control characteristics of the airplane because of a change in the range of surface travel. (c) Each stop must be able to withstand any loads corresponding to the design conditions for the control system." 2) "Now that I think about it, it seems to me that the control stops should be put as close to the flight controls as possible since there is always play in the system." Sub paragraph (b) above certainly supports the idea of putting the stops close to the actual control surface location. 3) "The crontrol stop was emitted off the new one and the C was modified to act as the control stop by allowing the stick to hit the edge." You can see in the attached photo number 0371 that I used the control stick hitting the edge of an adjustable U clamped aluminum bar as an aileron control stop -- one was required for each stick to provide for a stop in both directions. 4) "Rudder, Uhhhhhhhh forgot." It turned out that the rudder stops were the more difficult to come up with. I can't remember what I had initially, but it turned out to be inadequate since I managed to create a dent in my rudder surface by jamming the rudder into the inner end of the elevator while trying to taxi the airplane with the original inadequate Matco brakes. The boat cable clamps** that I eventually came up with did not crimp the rudder cables and the ty wrapped aluminum angles butting up against the seat back have proved to be effective if a bit clunky in appearance. I had modified my rudder control system to have an internal bellcrank mounted in the aft fuselage bottom with a push rod going back to the rudder itself. This eliminated the rudder cable coming out of the fuselage side on its way back to the rudder horn. Unfortunately I did not think to incorporate an adjustable rudder stop in my design of the internal bellcrank. Thanks again for your continuing support of the KIS community -- it is much appreciated. 'OC' Baker Says: "The best investment we can make is the time and effort to gather and understand knowledge." **PS: http://www.perko.com/ Rope clamp part number 1226 =============================================== ----- Original Message ----- From: "Richard Trickel" Sent: Tuesday, August 10, 2010 2:43 PM Subject: Re: Fw: control crossover O.C. and all The control crossover was modified to the square tube design by Vance in order to repair some geometry errors. The old one seemed fine to me but Vance thought it would be better. The crontrol stop was emitted off the new one and the C was modified to act as the control stop by allowing the stick to hit the edge. It is possible that this is not possible if your control throws are a lilttle low. Like if the counterbalance hits the skin before the stick touches the control crossover. For the elevator I let the pushpull tube rod end hit the sparbox for down and put a block on the rudder post for the up stop. Rudder, Uhhhhhhhh forgot. OK truth be known I did nothing here for all the planes i built. don`t know why. Now that I think about it, it seems to me that the control stops should be put as close to the flight controls as possible since there is always play in the system. I remember seeing the elevator and rudder of the cessna had stops there. What is the requirement OC Rich ============================================================ ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kis-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/KIS-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kis-list Browse Digests http://www.matronics.com/digest/kis-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.