Internal Layout and Buoyancy Tanks
When our boat was built, The Flying Fifteen rules contained
a clause permitting boats without full-height side tanks to have a slightly
lower weight limit. I believe this was an attempt to help out the older wooden
vessels by giving the new GRP boats (which tended to have integral side tanks)
a slight penalty.
The consequence of this is that GRP boats were instead built
with the side decks supported on 'posts', with smaller side tanks underneath.
This is a poor configuration for a number of reasons, and the rules were
subsequently changed to remove the aforementioned clause - however boats of
2663's vintage are stuck with these small side tanks, which do at least provide
a convenient shelf for running ropes and mounting fittings out of the way of
Our boat also features the fairly common low front buoyancy
tank, which again provides plenty of space for the chute-launched spinnaker as
well as other gear and control systems.
The stern contains a conventional full-size tank, and our
boat is also fitted with twin floor tanks, although we have also seen Porter
Fifteens of a similar age to ours without this feature. In actual fact, when we
bought our boat there were an additional two small floor tanks mounted either
side of the original centre console, behind the front tanks. These were
considered completely superfluous and were removed to save weight and make more
The front floor tanks which remain have a central 'channel'
between them which allow access to the keel bolts, and also provide a useful
space in which to run various control systems as described earlier. This
channel is covered whilst sailing by a removable floorboard.