Just dug out the flight manual for a 150H
To my surprise thereare actually 3 different performance right downs.
Supplement 3, take off increace by 3% ROC decrease by 30ft min
Supplement 4, t/o increace by 20% ROC decrease by 200ft min
Supplement 5 t/o increace by 20% ROC decreace by 160ft min
SUPPLEMENT 4 is the latest dated 1994