Assymetricals turn better because of the abrupt edges at the forward entry...and throughout the sponson length. I doubt that there is any inherent straightaway speed advantage between symetrical or assymetrical cats. I think that the Deepvee cat's "advantages" could be duplicated with steeper deadrise in an assymetrical design..... I believe the "deep vee" is more prone to stuff due to the lack of overall sponson lift forward and throughout..... Lift being a function of overall lateral surface...rather than symmetry.Originally posted by TopSpin80
In my opinion it becomes a trimaran when the center 'pod' becomes the longer and bigger of the three pods. However I am sure there are many other opinions out there.... so let's hear them.
T2x in today's powerboat market there aren't many 'symetrical' catamarans offered. Most planing hulls do better without sponson symetry. Most catamaran sailboats however are dislacement hulls and therefore do better as a catamaran and not a tunnel.. plus they are going too slow to have any advantage in packing the air to create lift.
what do you think?
The ground effects discussion is interesting..in that we always put a small vee in our tunnels to provide a break in the air flow, while at the same time allowing for a slight cushioning/cutting effect in the event of direct water contact....... we also added graduated steps on the tunnel walls to provide increased lift as the tunnel submerged in rougher conditions..........best of both worlds methinks.