In a message dated 8/25/2007 7:08:31 A.M. Pacific Daylight Time,
n98pb@sbcglobal.net writes:
Jim
Have you looked at your brake
rotors? I had a shimmy in what I thought was my nose wheel but found it
to be the rotors deforming with braking, (heat). Check them cold and
they appeared perfect. Final success was to go the high energy Cleveland
brakes and replace the rotors. No problems for 300
hours.
Pat Brunner
IVP
Jim: I second Pat's suggestion. We at Chino have chased nose
wheel shimmy problems evidenced at low speed during braking on landing rollout
on both LongEZs and Glasair IIIs. We brought in a Pro Stock brake designer
after watching the rollouts from along the runway and discovering main gear
walk. He suggested the cause might be rotor deformation due to heat or
wear so we replaced same and had a remarkable improvement in all cases. It
could be the tightly cowled main gear trap heat and cause the brake rotors to
deform.