The RS600FF is a modification of the RS600, light-weight sailing dinghy designed by Clive Everest and Nick Peters.
It differs from the conventional RS600 as it has hydrofoils.
[1] It is a single hander with trapeze and racks, and a hydrofoil system similar to the International Moth.
The Moth's ultra light weight have made them unsuitable for heavier sailors, the RS600FF was to an extent inspired by the Moth, but being bigger and suited to heavier crews was "made over" despite it being a one design class.
The main difference is the hydrofoils:[4] Changing the hull material is not possible, however even if the following are missing the boat would still be considered an FF The RS600 conversion's are reversible, they can be taken off to convert the boat back.