All F-9 models (F-9A, F-9AX, & F-9A) now incorporate larger Mk II floats, with 430lbs more buoyancy, and an improved, faster shape. The F-33 style daggerboard rudder is also now being included in all F-9 plans.
The first Mk II F-9 float for one of two F-9Rs being built in Auckland, New Zealand.