Wings are best for the narrower Taipan 4.9s which were grandfathered in. These platforms are 2340mm wide, so can 16cm wings can be added to each side to add righting movement.
And if my intuitive maths are correct, there would be more righting movement on a Taipan with wings compared to a standard 2.5m Viper due to the Mast step being relatively closer to the leeward hull.
And in relation to the wing rule, is there anything to stop you in the rules having these wings extend aft of the hull (skiff style)?
You get LESS RM as the mast is closer to the Pivot point; the leeward hull is the pivot point. by moving the mast towards it you are reducing the RM from the mast (and the hull).
Cats pivot on the leeward hull. To get max RM you want as much of the mass on on the windward hull (or close to it, or further away from the leeward hull).
RM can be broken down into these components (no wings)
1, Boat: 1/2 beam x mass (assuming boat is symmetrical)
2, Crew component = (beam +0.93 (average COG of a person)) x 75kg (average person weight) x no of crew on the trap + beam x 75kg x no of crew NOT trapping
Now add wings (we will calc the wing RM as a step)
1, Boat RM stays the same (but remember that because the beam is MUCH less RM drops)
2, "empty wing" rm = beam + 1/2 width of wing x mass of wing.
2, Crew component = (beam + wing beam + 0.93 (average COG of a person)) x 75kg (average person weight) x no of crew on the trap + (beam + wing beam) x 75kg x no of crew NOT trapping
