IIRC, the F and earlier models did not have the Fowler Flaps (i.e. combat flaps/maneuvering flaps) as they were introduced in the G model. Only the late model J's (J-25-L0) and L series had dive flaps. And contrary to the beliefs of some, not one model featured dive brakes.
**correction** the Fowler flaps were strengthened in the G model but were present in the F model.
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