|Mr. Lanchester proposed the completely different arrangement shown
to the right. His aim was to avoid the engage-disengage procedure by using
an all-geared, constantly enmeshed, full-fledged differential. But to satisfy
the specification given in the Sung Shih
many "misprints" (e.g. number of gears, total number of teeth) have to
Another problem would be accuracy: It is left as an exercise to the reader to calculate the directional deviation resulting from a mismatch of only one percent in the diameters of the road wheels.
(click for details)
If, for instance, the left-hand road-wheel moves faster than the right,
as on a westward turn, B will move while B1, B2 will
be almost stationary, and C will be turning while C1 will be
almost at rest. Hence D, D1 will react to precisely the same
extent but in the opposite direction. They will then stay put, though C,
C1 will resume their mutually opposite regular motion until
further relative change of the road-wheel velocities occurs.