Chf

If you croll down on this site, you can see three pics of a 120cm cat how I would build it:
http://www.rc-network.de/forum/showt...=133541&page=8

It´s the boat with grey hulls.
about 80 cm wide, but only ONE Rudder and ONE centerboard in the centerline of the cat.

Otherwise you don´t have enough transversal stability to sail the cat without crew weight -
and if the boat had two rudders and centerboards, one has allway to be pushed around the other.
This caused a lot of frustration and aimless discussions in the past.

Mast height 180 cm for 0.9 m2 will be ok!

Idealist