JULY 25, 2010
ANOTHER DERAILMENT - Occasionally passengers have undergone
derailments, usually when they have been leaning to one side or the other, or
when their weight is distributed too far to the front of the car.
FLOATING AXLE - The cars were designed with a three-point suspension,
with the front axle assembly able to freely twist from side to side to follow
uneven track.
SPRINGS INSTEAD - Using the same upright bolts at the centerline, and
installing springs on the outside corners, the weight is now on the springs.
ALIGNMENT BOLTS - I lined the bolts in the center with pieces of
ball-point pens and enlarged the holes so they could slide freely and keep the
springs straight.
SPRINGS IN PLACE - I drilled 5/8 inch holes, 1/4 inch deep, into the car's
base and at the corresponding positions on the floating axle assembly.  The
springs that seem to work best are 1 1/2 inches long, 9/16 in diameter, and
.080 wire thickness.
FINISHED PRODUCT - The axle on the left is now sprung, while the axle on
the right remains attached directly to the frame.  The car now tracks very
well.  The other car, using .065 thick springs, is probably good for riders
lighter than me.