Hi Bill

The 60 ft Parlier planning cat is on the water--congrates to the sailing team . Looks good .
http://www.parlier.org/site02/accueil/navigation/navigation3.jpg

It is nice to see innovation ,-though it will take some added refinment and sea trials to perfect this type of design.

agree completely with your comments -
A plan review and basic calcs with recommendations on any plan is generally a small portion of total budget ,-and the best time and or money spent .

Adrenaline -the Prosail raced FORMULA 40 -ft tri .
I watched it sail several times in the Prosail events from a H-21 participant veiwpoint in the other class.
It is quite a site to be racing on a crowded harbor like Newport in high winds and powerboat chop in all directions straining up on the port layline headed for the A mark and seeing a 40 long 40 ft wide tri round and start its downwind leg aiming straight at you doing about 25 . whew!
No where to go ,-difficult to get around a 40 ft wide craft doing 25 .

In fairness to Adrenalin ,The Prosail event organizers purposely picked the breeziest venues and times of year at each to insure good high windspeeds.

Its amas were small and pivoted for and aft ,
there was some research done on the pivoting concept by the Parliere design team earlier --shown in a video
http://www.parlier.org/site02/accueil/1024x768.html

The idea in Adrenalin was the amas would stabalize the platform, and to reduce sail area as needed though it was optimized for light wind conditions,-

Latter tri designs do have full 100 % volume amas ,{though fixed} good roller furler and reef systems ,and are very fast 30 ft tris that still race on Saginaw Bay MI http://www.sbyra.com/
and in the MAC races in the multihull div.
http://www.chicagomackinac.com/2003/

Comparative study of similar class category boats I think is Grobs perspective and goal from having available cad system drawings available , that rather than creating something from scratch .
-
I,m interested in the Formula 14s though-
It has only L -14,3 --a 24 ft mast max.-- and 300 total sq ft of sail as current rules , though should add a production class sub category with min boat weight etc .

It might be fun to walk through a Formula 14 design , though no two will agree on all design aspects.
Maybe we will see a 14 ft replica type 14 ft beam --2 masted Formula 14 soon ,-per 60 ft cat design .
Though as you noted if the proper hull volume ,calc waterlines ,displacement, moments ,boat and crew weight ,-bow sections hull shape ,structural engineering ,loads or crossbeams and stays -fittings and harware , sail area forces -heeling effects ,-hull design ,boards and rudders ,and numerous other design aspects given consideration it chalked up as a learning experience.

Interesting perspective drawings and seaworthiness articles for design consideration on this site ,-for larger multihull designs.
http://www.steamradio.com/JSYD/Articles/NESTalk.html


Last edited by sail6000; 02/22/04 04:14 PM.