Can you give me some more info on this "rocket" that you are sailing?

JJ

: On my 20' FD center board sail boat we would make to slot over sized and put
: point shims on the axle and one or two other spots for a no slop fit. We
: did not use jibing center boards do to the speed of these rockets,(15 to
: 20 knots). To keep the flow clean we epoxyed a piece of heavy mylar over
: the slot and after cure would split it with razor knife.The mylar looks
: like a midwing root fairing when down.You still would have reach under
: after launching to open the slot to clean out the sand put hopefully would
: not bind. Maybe you could put the out flow of the foot pump to blow it
: out, a quik roll with skirt open to let some in:)
: Don