1.3Vso my mistake.
I didn't know the 3 degree slope was in part chosen because of maingear limiting rates of descent in jets. However in my defense I don't know quite alot of things and it seems to get worse as I get older!
It appears that the 1.3 seems to be Large Jet-centric (no problem there) but does that make it as valid in the light aviation sector ?
TIM
(13,000hrs 777, 330's 707's cf 200hrs C152, Robin160, Pitts S1
Okay you definately win the TOP TRUMPS
)