In order to guarantee that everyone wanting to develop a kids F12 is moving in the same direction, I've put together a prelim set of class rules. This document is intented as a starting point and I would welcome any feedback and be willing to change pretty much everything.

www.ctmd.com.au/F12.pdf

Great start Scarecrow but please re-write Rule 1.3.1.
"Hull panels shall have a weight of not less than 1.2 kg/m2 (equal to 3 mm Gaboon)"

Sounds like something a New York lawyer would dream up....Keep it simple and just state in plain English what the minimum weight is... you can calculate that based upon the general box parameters built out of 3 mm Gaboon ply, just give a minimum finished ready to sail weight and everyone will know where they stand.

Thats fine by me..

My original hulls had approx 20kg (10kg each) of ply in them including bulkheads, longitudinals centre case sides etc. The newer design has much less.

Where do people think the minium weight should be set? 45kg? (100lbs)

Id rather just see a minimum beach weight as its quite hard to get a panel weight without cutting cores from the boat. I think we need to look at least 55-60 kg to make sure we end up with a durable boat, and to also allow the rotomolded crowd an even shot at producing a competitive boat as well.

Also, the sail area measurement needs to differentiate between conventional rigs and pocket luff rigs, not quite fair to add the mast area to their sail area calc. I'll knock out a sail measurement spreadsheet that will take care of this.

In the interest of getting as much racing as possible for the kids, perhaps we might look at the existing designs out there to make sure the rule is as inclusive as possible of what already exists.

Under daggerboards and rudders, skegs should also be allowed as some existing designs have these.

Other than that....great start
RG

My design is done at 12 ft 4.5 inches.
It just happened this length allowed me to do what I wanted.

On the other side of the coin the beam , mast length and sail are a little less.

I will build it as light as I can without the use of materials that will increase the cost and based on my own estimates I hope to come in around 50kg.

The rules document is a good idea to provide some clarity and focus.

Regards,
Phill

RG can you please confirm your hull length to date?

mine were done at 3.75m which is what Wouter had for a length (12'-3.67") I presume Wouter wanted a rounded number in metric ?
Phill, would an inch less make a big difference to you ?
Not overly fussed about length and will go with what the majority want.
RG