KR> Safety check item
Guys, For the guys with nose gear I found a item that I need to check on more often. The 4 an-3 bolts that go thru the Deihl nose gear bracket where it attaches to the firewall on mine have loosened up and slightly elongated the holes in the wood. This can not be identified with the weight on the nose gear. It has to have the nose raised and all the weight taken off to be able to detect the movement at the firewall. In all fairness I had an occasional front wheel shimmy and I found this defect while working on the shimmy problem. The hole elongation is vertical only not laterally. Joe Horton joe.kr2s.buil...@juno.com
KR> Safety check item
Thanks for the heads up Joe. I will check mine as that is one area I have not thought about. Mark Jones (N886MJ) Wales, WI Visit my web site: www.flykr2s.com E-mail: flyk...@wi.rr.com - Original Message - From: "Joseph H Horton" <joe.kr2s.buil...@juno.com> To: <kr...@mylist.net> Sent: Tuesday, March 20, 2007 5:56 PM Subject: KR> Safety check item > > Guys, >For the guys with nose gear I found a item that I need to check > on more often. The 4 an-3 bolts that go thru the Deihl nose gear bracket > where it attaches to the firewall on mine have loosened up and slightly > elongated the holes in the wood. This can not be identified with the > weight on the nose gear. It has to have the nose raised and all the > weight taken off to be able to detect the movement at the firewall. In > all fairness I had an occasional front wheel shimmy and I found this > defect while working on the shimmy problem. The hole elongation is > vertical only not laterally. > Joe Horton > joe.kr2s.buil...@juno.com > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at http://www.krnet.org/info.html
KR> Safety check item/ Front leg
When my front leg was fitted by ? the bracket was wider than the centre firewall brace, and the bolts ran either side of the brace in thin air and then into a very weak aluminum plate across the brace. I was horrified when I found it. I removed it all and t88 glued extra bracing and fitted a T6 plate to the inside of the firewall.. So ye, it is a place that needs safety checking during a service. Phil Matheson SAAA Ch. 20 VH-PKR Australia EMAIL: phillipmathe...@bigpond.com KR Web Page: www.philskr2.50megs.com http://www.vw-engines.com/
KR> Safety check item
Joe, On my nose strut, I could not tighten the AN4 bolts enough to squeeze the firewall bracket tight on the strut. There was always a little tiny wiggle. With weight on the nose wheel there was no detectable wiggle. Weight on wheels to weight off wheels cycles plus rough ground taxi will generate the wiggles. The shock load, as the strut hits one end or the other of its play, will impose large impulse shocks at the firewall. These shocks would be in the vertical direction. There's not much loading laterally due to the swivel of the nose wheel. The shock loads could also fatigue the epoxy joints in this area. In my case with Dan Diehl's concurrence I drilled the ¼-inch holes out to 5/16-inch and used close tolerance bolts. The strut feels like it is welded to the bracket now. On the firewall you have to keep the bolts tight clamping the wood. Wimpy individual 3/16 fender washers on the back of the firewall won't do here. Make a backup plate the same size or larger as the bracket on the front. Drill the holes to ¼-inch and put in AN4 bolts for some clamping muscle on this high stress area. Just like prop bolts, don't crush the lumber. Going to AN4 bolts will also help fix your elongated holes in the firewall. Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD USA >Thanks for the heads up Joe. I will check mine as that is one area I have not >thought about. Mark Jones (N886MJ) Wales, WI Visit my web site: www.flykr2s.com E-mail: flyk...@wi.rr.com - Original Message - From: "Joseph H Horton" <joe.kr2s.buil...@juno.com> To: <kr...@mylist.net> Sent: Tuesday, March 20, 2007 5:56 PM Subject: KR> Safety check item > > Guys, >For the guys with nose gear I found a item that I need to check > on more often. The 4 an-3 bolts that go thru the Deihl nose gear bracket > where it attaches to the firewall on mine have loosened up and slightly > elongated the holes in the wood. This can not be identified with the > weight on the nose gear. It has to have the nose raised and all the > weight taken off to be able to detect the movement at the firewall. In > all fairness I had an occasional front wheel shimmy and I found this > defect while working on the shimmy problem. The hole elongation is > vertical only not laterally. > Joe Horton > joe.kr2s.buil...@juno.com >
KR> Safety check item
Hi Joe, I wonder, could a guy drill these out and epoxie in some steel or aluminum sleeves to run the bolts through? Russ - Original Message - From: "Joseph H Horton" <joe.kr2s.buil...@juno.com> To: <kr...@mylist.net> Sent: Tuesday, March 20, 2007 2:56 PM Subject: KR> Safety check item > > Guys, > For the guys with nose gear I found a item that I need to check > on more often. The 4 an-3 bolts that go thru the Deihl nose gear bracket > where it attaches to the firewall on mine have loosened up and slightly > elongated the holes in the wood. This can not be identified with the > weight on the nose gear. It has to have the nose raised and all the > weight taken off to be able to detect the movement at the firewall. In > all fairness I had an occasional front wheel shimmy and I found this > defect while working on the shimmy problem. The hole elongation is > vertical only not laterally. > Joe Horton > joe.kr2s.buil...@juno.com > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > Post photos, introductions, and For Sale items to http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at http://www.krnet.org/info.html
KR> Safety check item
There are several aircraft designs out there that do just that. Steel tube stock of the correct inside diameter is cut slightly shorter than the dimension of the structure through which the bolt will pass (to allow for slight wood crushing). Ed > Hi Joe, >I wonder, could a guy drill these out and epoxie in some steel or > aluminum sleeves to run the bolts through? > Russ > > > > > > Guys, > > For the guys with nose gear I found a item that I need to check > > on more often. The 4 an-3 bolts that go thru the Deihl nose gear bracket > > where it attaches to the firewall on mine have loosened up and slightly > > elongated the holes in the wood.
KR> Safety check item
Russ et all, I had to think about this for a couple days and decided that this is not what I would or am going to do. The only way that I see a sleeve being an advantage is if it was long enough to be in the metal plates on each side of the wood. Other wise the sleeve in the wood alone would have 2 places for movement to start. One location being the sleeve to wood fit and the other being the clearance around the bolt through the sleeve. The way mine will be repaired is the top 2 holes will be reamed out to take a 1/4" bolt and the bottom 2 holes which are too close to the floor board to drill out will remain AN3 embedded with flox. I always did have a backer plate on the cockpit side of the connection. I really think that the occasional shimmy as well as the 4.5 g landing a year and a half ago are the case and contributing factors for the elongation of the wood holes. I'm slightly better at landing now and (I only scare me not passengers) I have replaced the strut with a new one. Still a location that should be checked with the annual. Joe Horton, Coopersburg, PA. joe.kr2s.buil...@juno.com On Fri, 23 Mar 2007 03:13:19 -0800 "Russ Kendall" <rkend...@bendbroadband.com> writes: > Hi Joe, >I wonder, could a guy drill these out and epoxie in some steel > or > aluminum sleeves to run the bolts through? > Russ > - Original Message - > From: "Joseph H Horton" <joe.kr2s.buil...@juno.com> > To: <kr...@mylist.net> > Sent: Tuesday, March 20, 2007 2:56 PM > Subject: KR> Safety check item > > > > > > Guys, > > For the guys with nose gear I found a item that I need to > check > > on more often. The 4 an-3 bolts that go thru the Deihl nose gear > bracket > > where it attaches to the firewall on mine have loosened up and > slightly > > elongated the holes in the wood. This can not be identified with > the > > weight on the nose gear. It has to have the nose raised and all > the > > weight taken off to be able to detect the movement at the > firewall. In > > all fairness I had an occasional front wheel shimmy and I found > this > > defect while working on the shimmy problem. The hole elongation > is > > vertical only not laterally.
KR> Safety check item
Yes Joe, but a sleeve or bushing will increase the area of contact with the wood quite dramatically. A few moments with your calculator will prove this outbob p --- "Joseph H. Horton" <joe.kr2s.buil...@juno.com> wrote: > Russ et all, > I had to think about this for a couple days > and decided that this > is not what I would or am going to do. The only way > that I see a sleeve > being an advantage is if it was long enough to be in > the metal plates on > each side of the wood. Other wise the sleeve in the > wood alone would have > 2 places for movement to start. One location being > the sleeve to wood fit > and the other being the clearance around the bolt > through the sleeve. The > way mine will be repaired is the top 2 holes will be > reamed out to take a > 1/4" bolt and the bottom 2 holes which are too close > to the floor board > to drill out will remain AN3 embedded with flox. I > always did have a > backer plate on the cockpit side of the connection. > I really think that > the occasional shimmy as well as the 4.5 g landing a > year and a half ago > are the case and contributing factors for the > elongation of the wood > holes. I'm slightly better at landing now and (I > only scare me not > passengers) I have replaced the strut with a new > one. > Still a location that should be checked with > the annual. > > Joe Horton, Coopersburg, PA. > joe.kr2s.buil...@juno.com > > On Fri, 23 Mar 2007 03:13:19 -0800 "Russ Kendall" > <rkend...@bendbroadband.com> writes: > > Hi Joe, > >I wonder, could a guy drill these out and > epoxie in some steel > > or > > aluminum sleeves to run the bolts through? > > Russ > > ----- Original Message - > > From: "Joseph H Horton" > <joe.kr2s.buil...@juno.com> > > To: <kr...@mylist.net> > > Sent: Tuesday, March 20, 2007 2:56 PM > > Subject: KR> Safety check item > > > > > > > > > > Guys, > > > For the guys with nose gear I found a > item that I need to > > check > > > on more often. The 4 an-3 bolts that go thru the > Deihl nose gear > > bracket > > > where it attaches to the firewall on mine have > loosened up and > > slightly > > > elongated the holes in the wood. This can not be > identified with > > the > > > weight on the nose gear. It has to have the nose > raised and all > > the > > > weight taken off to be able to detect the > movement at the > > firewall. In > > > all fairness I had an occasional front wheel > shimmy and I found > > this > > > defect while working on the shimmy problem. The > hole elongation > > is > > > vertical only not laterally. > > ___ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to > krnet-le...@mylist.net > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at > http://www.krnet.org/info.html > Bored stiff? Loosen up... Download and play hundreds of games for free on Yahoo! Games. http://games.yahoo.com/games/front
