Control stops should be at the input end. Compression and tension loads would be minimum, Virg
On Thu, 22 Sep 2005 11:14:46 -0700 Jim Mullen <jmul...@tyeeair.com> writes: > 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 > > _______________________________________ > 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 > > Virgil N. Salisbury - AMSOIL www.lubedealer.com/salisbury Miami ,Fl
