Having drakes hasn't stopped occasional predation from aerial predators here. I don't lose them often to hawks, but usually when I do they can't carry the duck off, so size doesn't matter. A drake will not protect the hens.
The easy answer is no. My geese go after my muscovy. My turkeys aren't much better. My donkeys and goats afford some protection just by being around, but if a duck is out in the open it's a target.
I've had a few hawk kills. I've had fox, coyote and coon kill my muscovy. Providing cover can...