Originally Posted by
stevef
I think you've been given duff gen, GR4. The defensive armament on the Lancaster & Halifax (and all Bomber Command aircraft as far as I've read and seen in technical images) was air cooled.
Originally Posted by
langleybaston
The plumbing was for waggling, not cooling. Some turrets hydraulics, some electric. Very few had manual waggle and shoot.
LB: Yes, I'm aware of that, despite only being 68.
The original mention was that the guns were
water cooled (not air cooled). The aircraft hydraulic system in those days would have been vegetable-based oil, I forget the RAF stores DTD number. These days it's 585/Fluid 41 or Skydrol.