AKA, how to win parenting forever.
My first consideration was strength and stability for the safety of the little ones, as though this project is for my 1y/o, I also have a 5y/o who no doubt will want a turn. The need to be strong enough to handle a beating led me to the first part of my design, a rigid backbone with a solid plywood top for the seat platform. This gave me a good foundation for things like the handles and outrigger to mount from, and somewhere to fix the 3D printed hull shell.
The rocker arms were the source of great deliberation (as you can tell by the multiple sketches above) as the effects of the weight of the speeder bike and a toddler over a guessed center of gravity was quite a challenge. My solution was to use the two center rocker arms to clamp either side of the speeder bike's timber backbone but still have clearance to slide the rockers back and forth 50mm or so to find the center of balance. This design also has scope to easily replace the rocker arms with maybe a (motorized?) rolling mobile base….. I'm just thinking out load…. stay tuned….
Rocking Speeder Bike [Tez_Gelmir/Instructables]
(via The Mary Sue)