Formula 40 catamaran class rules

[Alik]

Originally Posted by powerabout

Sorry I didnt mean that I was interested to know how much load on a 40 footer at the boom

Will check; not performed rig cals yet.

[SerjKu]

Was interested in this question but has found nothing. All data on this class at me from magazine "КиЯ" №127-128 , article Perestjukov. The big request if that is found out to share the information.
I think it is necessary to search at designers.

I am sorry for bad English.

[dougfrolich]

Great looking boat Alik--
Mainsheet load on the 40 I've played with was about 5500lbs before lift off.
I like the arrangement you have made for the forestay--intelligent design.
Looks like FUN.

[luff tension]

Originally Posted by Bruce Woods

I may be wrong but I think the small (tiny) jib large main combination came about through the rule. A storm jib had to be carried so Randy's answer was to make it earn its keep, and fly the thing.

Can anyone confirm?

The F40 rule specified a maximum upwind sail area (80sqm I think) and a maximum downwind sail area (main, jib and gennaker 160sqm) to maximise both the storm job size was used.

[Gary Baigent]

There were many variations, for example:
Main Genoa Spi Designer type
m2 m2 m2
Fleury Michon 63.8 24.3 115 Irens cat
Idenek 65.2 18.1 112 Irens cat
Jet 40 74 9.4 97.2 Ollier cat
Smyth Team 75.2 8 97.2 Smyth cat
Promocean 58 30.8 108 Thompson tri foiler

[Silver Raven]

Originally Posted by Alik

Come on, nobody draw actual number of blocks on renderings...


This arrangement is more comfortable, in my opinion.

G'day 'Alik'. "in front of traveller" YES YES The way to go - 20 out-of 10 for that design improvement. "more comfortable" & stops the mainsheet fouling the 'steering cross-bar'. Well thought out & IT'LL sure work well !!!

Now if you 'canted' the hulls out at 7 degrees +/- 2 degrees - then you'd have a - lighter, stiffer (both at rest & while sailing) & easily carry 15% more sail area in all wind/weather/sea conditions. It's been proven to work - very effectively - like on 'Sundancer' many years ago - but nobody picked it up.

Great boat - sure wish I was over there playing with you guys. Looks a real blast. Ciao, james

[Richard Woods]

Gary

I think the Irens listed were first generation. That's why the genoas are big. The foiler was an embarassment, couldn't get out of its own way. Not much quicker than our 24ft Strider when we raced against it

I first used a tiller bar in front of the mainsheet track on my Banshee design. On a big mainsail boat like the F40 you need more than a 8:1 mainsheet so it will be lead forward, split and back to the cockpit (one reason for the AC solid wings is to lower the mainsheet loads)

However my Banshee had an 8:1 mainsheet so we had to decide whether to take the tail above or below the tiller bar. We chose above so we could release it easily. That meant putting the lower block on a strop to raise it

Richard Woods of Woods Designs

www.sailingcatamarans.com

[Alik]

Meanwhile, we are running performance predictions for desired weather conditions, calcs of laminates & weights.