Very interesting, thanks for that. Any idea why they felt the change necessary? Were they running into a (stick force) stability issue?
There was a lot dive testing going on around the war and they played with shapes to affect the hinge moments and effectiveness. The technology development ended when the Brits figured out the flying tail. GG looks more bulbous, but it could be an illusion from the squared tip, or a later model elevator. I'll be around a stock D model next month and I'll look then.
Wasn't going to bring it up. Think we can figure out the failure sequence collectively without referencing that detail. If we couldn't, was going to spend time looking into the elevator shape, and maybe shock bursting on the wing if the speed and g warranted.