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As the mother would have trouble lifting her daughter over anything beween the seat and pedals, the sidecar has a cantilevered drive shaft ending in very short Z crank arms. A regular pedal on the outer end and a home built plywood platform pedal with oil impregnated ultra high molecular weight polyethylene bushings on the inner section.

Inside the aluminum cylinder that carries the sprocket is a clutch that the captain can disengage when her daughter doesn't have enough steam to keep pedaling. Even when she does pedal it will mostly just be passive exercise to get her body moving a little. The front crank has four sprockets, one of which is just for the extra chain to the sidecar drive shaft.

The sidecar frame is rectangular1.5" x 0.75" x 0.049" wall chrome-moly tubing from Dillsberg Aircraft.