Sixty-six AC1's were knocked out (4 survive I believe?) and
technically the AC1 is the only one to actually be called 'Sentinel'.
The ACII was an experiment with off the shelf truck engines, ACIII carried a 25pdr (uncertain whether any were fully completed) & AC4 had the
twin 25pdr turret for testing if it could withstand the recoil force of it's intended 17pdr armament. The tests were a great success and a 17pdr was successfully fitted onto the ACIII's hull.
An excellent design, all abandoned in July '43 when Sherman production could meet all Australian needs.
Why is it that whenever the Ram's mentioned the Sentinel also crops up immediately? (same on ww2talk currently) something to do with 'lost commonwealth projects' and feelings of regret therein...
The poor old Grizzly hardly ever gets a mention.
Cheers,
Adam.