Shawn that's perfect - the bit about the 3 deg slope limit being due to the test being done worst case. I know at least one other system that was tested like that and it was absurdly restricted 99% of the time. I suppose there is a balance between simplicity (3 deg - easy to remember always safe) and complexity (6 deg with no crosswind, 4 deg with lat CG and light wind, 3 deg on a Wednesday - impossible to remember but useful on certain days of the week).
I like the idea of a calibrated grass slope. The 12deg at a certain test establishment is a little unrepresentative.
Crab - love the way you point out slope limits determined "by Boscombe". Surely not those hallowed souls they call Test Pilots? - I wondered where all the average pilots had ended up
(Light touch paper, retreat rapidly, enjoy)....happy Bonfire night.