For anyone building a tadpole trike the subject of Ackerman Steering comes into play. It is all important and must be incorporated into the design build if the trike is going to handle properly. The front end steering of a tadpole trike is rather complex. There is camber, castor and Ackerman steering involved. It all has to be correct if the trike is going to be safe to ride. In short, YA GOTTA DO YOUR HOMEWORK!
There are many videos available explaining Ackerman Steering. Here are a few of them:
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Tadpole Rider 