chasb(at)satx.rr.com
Guest
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 Posted: Tue Apr 15, 2014 8:54 am Post subject: Shaky Nose Wheel |
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Wow. That video really shows some problems.
While most of your vibration seems to be lateral, I noticed some rapid fore and aft oscillations of the wheel and strut assembly immediately after the nose wheel touches the runway. That tells me that the tire and wheel may not be not spinning freely. If the tire doesn't spin freely, it causes the nose strut to move aft and then rebound, resulting in up and down oscillations and associated vibrations until the speed is slowed down greatly.
Second, as mentioned by several others, make sure the breakout force of the nose wheel is tightened according to Van's instructions. Better too tight than too loose.
Third. Around a 100 hours in my bird, I found the bolt at the top of the nose gear strut was a bit loose and had slightly wallowed out the hole in the nose gear trunion on the motor mount. I debated pulling the engine and the motor mount and over sizing the hole in the trunion and the strut. Ultimately, I just super tightened the nut on the firewall side of the strut. I check it frequently by raising the nose gear off the ground and trying to twist the strut in the mount. Fortunately, it has remained tight for the last 200 hours.
Lastly, Van's cure for vibrating wheels is to reduce the tire pressure. Applies both to nose gear and the main gear also. I generally carry about 20 to 25 psi in all my tires.
Charlie Brame
RV-6A N11CB
300 hours
San Antonio
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[quote]Time: 09:33:07 PM PST US
From: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)>
Subject: RV-6A shaky nose wheel
I've occasionally felt some strange vibes coming from the front of the
airplane on landing but wasn't sure what it was because it happened so
seldom. I put a camera under the wing tip and caught it red handed a few
weeks ago. It hadn't happened for quite some time before then and coincided
with me filling the nose tire (~35 PSI) prior to the flight. Check out the
you tube link below (first 2 minutes) and tell me what you think . Is it
caused by higher pressure in the tire or? The thought of the gear leg coming
apart from all that shaking makes me a bit nervous. Like to find a cure so
that doesn't happen. I noticed at the last annual that the nose tire is
wearing much more in the center and I have NOT installed a wood stiffener on
the leg.
www.youtube.com/watch?v=p_CaaRJh3pA
Dean Psiropoulos
RV-6A N197DM
200+ hours of flying fun[b]
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