What is it? ? ? ? This odd-looking
contraption (code-name the Flux Capacitor)
is an early prototype of a light-weight U-Joint. The four black
hubs have bearings.
All four are bolted into the head of an aluminum bolt. Two hubs
are recessed into
holes drilled directly into the side of aluminum bolts. The hubs
fit snugly enough, but
two aluminum nuts tighten against the hubs to ensure they don't slip
this particular custom design provided good insights into multi-axis
rotation, but hasn't
found a specific use yet. However, U-Joints are heavily used in R.Max.