Rory, Alan and I had an online design review session today. The latest design from Alan Ball looks at two ways to make the seat self adjusting when you morph. This version puts a hinge below the seat, at the same joint as the front morphing joint. There is a knuckle attached to the seat back that forces the seat forward as you morph down.
Bobby Hall seat positions shown in blue. Note that the Morph in low rider is a longer vehicle than the Bobby Hall. And that the rider sits further forward. Our seat height is about the same.
Now in high rider mode. Notice that the knuckle behind the seat is shorter. This tilted the seat back in high rider.
This is a different approach. A subframe is hinged just below the front of the seat. A tab pushes up the rear of the seat as you morph down. The seat tilts up at 11.5 degrees, which is what you want.
Version 2 showing the seat inn high rider mode. The mechanism has lowered the rear of the seat, and reduced the tilt. The grey lines show what the tilt would be without the mechanism. That tilt would be uncomfortable at best.
We are 2.87 degrees tilted forward. This seems to work well in high rider mode.
Without a seat tilt correction, the tilt is almost 11 degrees forward, which is not acceptable.
Click on the two versions of the model below to see it in 3D. You'll need the free e-Drawings Viewer (for Mac or PC)