Hello Luiz-

Given I own 2 Roberts designs I would agree about the wave piercing technology but I would rather be on my FMS SC20 in a "Breeze" with its roller furling jib. If its over 20mph; Aquarius builder Haberman states that "reducing sail" is necessary for safety. I have not sailed a ARC21 so I don't know about that boat. I believe that the SC20 is the best of the Roberts designs I have sailed. It will take anything thats thrown at it the best of any cats I have sailed in the last 35 years. I have sailed the following beachcats: Shark, Hobie 14, 16, 18, & 20, Alpha 18, Tornado, Sol Cat 18, Dart 18, G Cat 16, Nacra 5.2 & 6.0, etc. A friend has an I20 but he has had both rudders and one mast break. So you see I haven't sailed every beachcat out there.

thommerrill
F25c 009 Charisma
ARC22 2234 Widowmaker
FMS SC20 57