From the GII to the -650 they have stuck with a large, lightly loaded wing with no slats.
While true, their wing design has certainly changed over the years - especially between the original G-II (G-1159) and the G-III (G-1159A). The latter "supercritical" wing was also retrofitted to the "straight" G-II to make the G-IIB (G-1159B) with Gulfstream designed winglets. About 70% of the original G-IIs were retrofitted with Joe Clark's (Aviation Partners') winglets to create the G-IISP, using his patented "blended winglet" design.
I'm pretty sure that certification costs and efforts precluded the G-IISP AFM to reflect obvious performance increases however.
Cheers,
Tom
Home of the "Fresh Pick" STC - Trolltune Corporation
Home