Robert, don't read too much into the test stand configuration as the same engine/stand
was used to test the six-bladed pusher contra-prop for the twin XT-37 EB-35B.
The engine stand and propeller gearbox layout shown was probably chosen for reasons of
space and simplicity, as it was easier and safer, for test purposes, to drive the shaft from
the front of the engine than it would have been to drive it from the hot section, as planned
for the actual aircraft installation.