A Prindle 18 main sail is a dead match for the G-Cat 5.7 main. The jib is harder to match since the G-Cat jib goes past the bridle and tacks onto the forward crossbeam. You can use the Prindle 18 jib but you give up about 4 square feet of total sail area. (The Prindle jib will tack at the junction of the bridle wires)
I used the P-18 set-up on my 5.7 and it was faster than with the original G-Cat sails, due to the fact that the P-18 sails were built by Randy Smyth. Better cut, better cloth and better battens equals more power! I sold the boat with both sets of sails and the new owner also prefers the Smyth sails over the OE sails.
a larger sail can be cut down to fit
i sail with a 5.7 that uses a tornado main and full sized jib. the jib blocks have been moved back a foot and are attached via the tramp lacing.
just found an other cat a Sol-cat 18 foot any thoughts or ways to find out how old she is . Only pay $250 for the cat going to redo her for next year. still looking for sails for the G cat 5.7
-- Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap --
Not sure, I just saw in the post above you were looking for Sol Cat gear
-- Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap --