Jack and all, Regarding your push rod design, and please take every thing I say with a grain of salt, or at your own risk. but I am in the push rod business and have been designing them for nearly 25 years and I am a month or two away from creating my own set of push rods and control stick for the KR2S I am building (elevator only), the problem I have is that I am 6'1" and want my back side as low to the fuselage skin as I can get it to keep from banging my head on the canopy. This means that if I use a straight push rod all the way back it will sit near my hip, and we all know we do not have much to spare there either. So a series of push rods is needed to get it low between the spars and then back up the elevator horn.
I am planning to model up my own design in the next few weeks and will gladly share it for scrutiny with the net group. Have you done any load testing with the bent (joggled) rod in compression? I would be concerned about it bending under maximum input load and suggest if you have not done some testing you should, pin the down stream bell crank and see what your Pull up and miss the mountain force is and is it deforms the bent push rod or not. I just be saw something that looked a little skinny on the column bucking side, it may be perfectly fine, but for every one that is looking at push rod designs, even your straight push rod designs should be analyzed and proven by test to be safe. Jim Mullen KR2S Everett Washington -----Original Message----- From: Jack Cooper [mailto:kr2coo...@earthlink.net] Sent: Thursday, September 22, 2005 8:28 AM To: brokerpilot9...@earthlink.net, KRnet Subject: RE: KR> Pushtube control Peter Here is how I did a control tube elevator. http://jackandsandycooper.com/stickandpedals.html (Near the bottom of page.) I had considered using control tube ailerons and actually making flaperons but after several attempts decided I was wasting too much time and money. Jack Cooper > [Original Message] > From: Colin Rainey <brokerpilot9...@earthlink.net> > To: <kr...@mylist.net> > Date: 9/22/2005 8:56:56 AM > Subject: KR> Pushtube control > > Peter > I have push tube control for my KR2 from the dual stick assembly all the way to the elevator horn with a transfer bell crank approximately 12 inches behind the seat/rear spar. It is also drilled to allow for the same and reduced deflection with same total movement at the elevator, but more at the stick to de-tune the sensitivity of the KR elevator. I really like how positive it feels, and am reassured with each pre-flight that I made a good choice. Pictures are on the web page, on the krnet. > > > Colin Rainey > brokerpilot9...@earthlink.net > EarthLink Revolves Around You. > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
