sycamore
No Jetplan in those days.
Latterly, even when using Jetplan, the diversion fuel was never calculated on an Undercarriage down and Unpressurised scenario.
I remember doing the fuel calculation for the undercarriage down diversion, which gave us a bit of a loiter capability, and then the NLG window was removed. So start again, a recalculation of the fuel required at 12000ft meant we had to depart for Clarke AFB straight away. Luckily, the calculations were correct and we landed with minimums. It was a tense 3 hour diversion.