Most of the heat related failures I’m aware of on plastic brake lines were on Varieze, Longeze types or other types that rely on Brake steering. Usually guys doing high speed taxi tests over and over. In quite a few instances the brake area got hot enough to soften the resin in the bottom of the landing gear and twisted or bent out of shape. I helped repair one of those once, what a giant mess!!
Larry H > On Mar 6, 2019, at 8:47 AM, mark jones via KRnet <[email protected]> wrote: > > Thanks for the observation guys. The tubing I used is from AS&S part number > 05-12488. This is NSR tubing rated for 2120 lb burst pressure with a wall > thickness of .050 and recommended for use with hydraulic brake lines. It > has a minimum bend radius of one inch. It is also rated for flexural > fatigue and vibration. It will not become brittle and is self > extinguishing. I agree with Mark L on his comment on the angle and a > pressure test will be conducted before putting that in use. I had already > put that on my list prior to this email. On my previous KR the tubing I > used was standard 1/4 Poly-flo tubing and I never had a leak with it. I > would be more concerned using either steel or aluminum in this application > due to the constant movement between the caliper and the gear leg causing a > crack in the tubing since neither are flexible. > > Mark Jones (N771MJ) > Oldsmar, FL > > [email protected] > www.flykr2s.com > > > On Wed, Mar 6, 2019 at 9:16 AM Mark Langford via KRnet <[email protected]> > wrote: > >> Larry Flesner wrote: >> >>> I saw in one photo where you have "plastic" brake line running from the >>> gear leg to the caliper. I've heard of incidents where the brakes get >>> hot enough, when used for steering, to soften the line and have it blow >>> out. You might want to consider a metal loop. >> >> Aluminum brake lines down there do make a lot of sense, and might have >> better bend radii to do a loop or something...worth a try. One of those >> lines has a pretty severe angle on it where it enters the fitting. >> That'll teach you to post photos! >> >> I will say that I have something like 4000 landings between my KR2S and >> KR2, both with Nylaflow lines, and I haven't had a problem. I often do >> 6-10 touch and goes at a time, but I'm sure they cool off between >> landings. >> >> Mark Langford, Huntsville, AL >> ML "at" N56ML.com >> www.N56ML.com >> >> >> >> _______________________________________________ >> Search the KRnet Archives at >> https://www.mail-archive.com/[email protected]/. >> Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. >> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change >> options. >> To UNsubscribe from KRnet, send a message to [email protected] >> > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/[email protected]/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to [email protected] _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/[email protected]/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to [email protected]
