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Tailwheel Shimmy - probable cause

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Clipped Cub

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Thanks to all who made posts and helped with my shimmy. I purchased a new tailspring from Univar for the Cub. I removed the old spring today and found:

1) the top spring had deformed allowing the plane to sit a little lower and made the kingpin axixs near vertical.

2) the tailspring I removed had two middle springs as both had an elongated bolt hole.

I installed the new tailspring and need to shim it as was suggested to ensure a good kingpin angle. I am going to have the shop on my field make a shim and finish the installation this week.

See pics attached. Thanks for all the help. You guys on the forum are a huge help!!



Craig


TW Spring 1.JPG


TW Spring 2.JPG


TW Spring 1.JPG


TW Spring 2.JPG


TW Spring 1.JPG


TW Spring 2.JPG
 

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