The cockpit drain hoses in IDUNA are crossed, i.e. port-to-starboard
and starboard-to-port. I can understand the reason for routing the
drains in this manner and I can also see merit in routing the drains
directly to each seacock - port-to-port, etc. We are interested in
how the cockpit drains in other BCC’s are routed and if the drains
are routed to the same side if water enters the cockpit in a seaway.

Fair Winds,


The factory built BCC’s are routed direct, Port to Port and Starboard to
I have hull # 95, built by the factory in 1989/1990.
Direct routing gives you a lot better access in the engine room.


On Waxwing the cockpit drains (located in the foreward
end of the footwell)are plumbed port to port and stbd
to stbd thru-hulls. The thru-hulls are located approx.
18 below the aft end of the footwell and 12 inches aft
and 12 inches outboard of the after end of the
footwell. These locations are difficult to describe
and I doubt are the standard location on the factory
finished boats.
However, this placement has proven satisfactory in
preventing any backflow of water into the cockpit
I also plumbed an electric bilge pump discharge hose
(with a high loop)to each cockpit drain thru-hull
using a “T” fitting at the thru-hull. While these
thru-hulls are slightly below the waterline the bilge
pumps cannot backflow since the cockpit scupper acts
as a syphon breaker.

With one rare exception this set up has worked fine
since the system was installed in 1977. Note: the rare
exception was just last year when a coffee cup exactly
the necessary size was set over a cockpit drain. Thus
when I turned on a bilge pump the syphon breaker
effect of the scupper was negated and caused the bilge
pump to keep cycling as the water was pumped out only
to syphon back in when the pump turned off.

This situation only drove me half crazy (my wife says
it was the last half I had left)until I discovered the
coffee mug covering the drain.
I guess I should also note that in Waxwing the engine
is located under the galley sink (which is directly
under the companionway steps) and does not extend
under the cockpit footwell at all; thus I have access
to the entire area below the cockpit from the inside
of the boat.

Stan on Waxwing

Do You Yahoo!?
Get email at your own domain with Yahoo! Mail.

my cockpit drains are plumbed ipsilateral as well. there is a 90
degree elbow just below the scupper on port that does not help
drainage. the cockpit, despite what ferenc mate says is slow to
drain. probably due to the scuppers themselves. the grate is made of
small holes(3/16"?) drilled in it. this grate is part of the casting
itself. i have not come up with an easy way to change it. the
result is that the cross section is much smaller than the hose
below. additionally the hole are small enough that air bubbles get
trapped in the holes and impede flow further (probably not important
if the cockpit is full, but a nuisance at wash down time).
john churchill