I am using 4130 steel for my roll bar but my plane is a radical departure from a standard KR so I don't know how carbon fiber would work. ----------------------------------------------- I also have a 4130 roll bar, very similar to a RV4.
If you look at my web page below and look at "Latest Update Photo page" - from the heading at the top- and see bottom 3 photos Also the Finished Building Photo's" - page - and look at the 2nd and 3rd row of photo's. It is hard to see, but there are two cables from the top of the bar to the tail bulk head, to stop the bar being pulled onto the pilot while the plane is sliding down the runway upside down tail first. Phil Matheson SAAA Ch 37 http://www.philskr2.50megs.com/
