I was just reading the wikipedia article on duplex drive. It sounds like it was actually quite successful on four of the five beaches, even though the waves were significantly higher than it was designed for.
Almost every website I look at has different figures on it, but if wikipedia is correct, when deployed -
Sword Beach - 1 DD tank lost on the way in
Gold Beach - 8 DD tanks lost on the way in.
Juno Beach - 8 of 29 DD tanks launched were lost on the way in. The remaining tanks were ferried to the shore by the LCTs
Utah beach - 1 DD tank lost on the way in.
I know that there were terrible losses on Omaha beach (29 DD tanks launched and only 2 made it) but they were launched far beyond their intended distance in extremely bad condition.
Almost every time I see them described on television the DD tanks are described in terms of failure, based on the horrific number of losses at Omaha, but I can't help wondering if that's not fair on the designers and engineers that made the DD tank.
The only numbers I can find for the total available is on Omaha where 64 DD tanks were available, with the remainder of those not launched landed directly onto the beach. Assuming similar numbers were deployed on the other beaches they don't seem to have done too badly, especially considering the bad conditions, over the shorter distances they were intended for.
I also hadn't realised that the tanks were fitted with breathing apparatus in-case they sunk, and that most of the crews of the sunken tanks were rescued. This directly conflicts with one documentary I've just been watching that stated most of the drivers of the lost tanks were drowned.
I know that websites and TV documentaries aren't the most reliable sources of information though, so I'm wondering whether I've understood this correctly. What do folks on here think? Has anyone got some more reliable information?