Carl,
==see inside:

CARL-or a tri --there are great foiler tri designs with the design intended to lift the leeward working ama - A center planning type tri hull could be added .

LUIZ - Exactly. And unlike a cat, you can force a tri to plan in its aft sections by means of slightly inclining the amas forward. When it heels the main hull authomatically raises the bow. This design feature is also good to prevent pitchpoling and maintain a good angle of attack for the foils.

CARL-Weight complexity etc would be the drawbacks of the planning hull Kirt descibed. Both hulls would help but when is a cat sailed level at speed. Think there is suffecient area in a hull as descibed along with a small forward angled lifting foil set at correct cant to plane .

CARL-Some in certain flat water high wind broad reach conditions have felt this on I-20s ,-the boat hitting over 25 on the GPS and feeling really skittish at those speeds ,-trying to plane.

LUIZ - ...but finding an insuficient planing surface. Add the foils and it will fly. The Catri 27 was reported sailing at (sustained) 27 knots in flat waters - planing on foils and main hull. The designer expects speeds approaching or equal to Open 60s in equal wind/wave conditions (but the tougher ones, naturally). Planing cats should be able to sail even faster because they don't carry a cabin, head, etc.

CARL-The combinations of proven ideas and design concepts have to be refined ,sometimes in a trial and error process but the intricate combinations of solutions to the planning cat hull are progressing .

LUIZ - I hope to see planing multis become dominant eventualy. It is only a matter of time.

CARL-Fun stuff ,-hope we see some planning types soon .
Carl

LUIZ-Yes!