another

another, rendered

rendered from above

rendered from below

Stern View

Bow View

3d from below

another from below

RG, will it have boards or no?

I like that, I can see a kid getting excited about a boat like that!

Rhinoceros ?

Nice one... <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />

Ahhhh...Retiredgeek the right CAD tool in the hands of someone who knows what to do with it...great start...question....is there any reason why you did not put more volume lower in the hulls?... as has been the design trend lately? Your drawing shows the bow shaped (in profile) somewhat like a “wave piercer" (please no tangents on what constitutes a wave piercer from the peanut gallery)…but the hull volume distribution in cross section looks more "old school"... any particular reason for this? If I understand you this rendering is something you quickly threw out here as a starting point with refinements coming as your schedule allows. Nothing like a high quality, esthetically pleasing rendering to get things moving out of the doldrums.

Best Regards,
Bob

I would be willing to bet that the wave piercing hull is just for looks, I don't think that the boat will actually use the ability much, but it does look cool because it looks like modern boats.

Thought perhaps I should clarify a few things here, RG drew the hulls that my son's designed as a favor to me, the design is all their's and I seriously doubt it reflects RG's thinking.
What started out as me showing my son's Wouters preview drawing last Friday has now turned into a full on design project by them that RG is just assisting them with. Foolishly I said that if they really wanted new boats instead of my hand-me-down Paper Tiger, then they would have to build it (F12 like & wood) and figure out what worked, I have been seriously taken to task and Im sure my wallet will regret it.
What RG posted is no more or less than what my son's asked for help on and over time <perhaps not a lot> it will change, and given the chance Im sure they will probably totally redesign Wouters boat as they go <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />
This is largely a product of having a single cat available for 2 sons that is often too powerful for even both of them to sail in much over 10 knots.
Happily, Im very proud that they have taken on the challenge, and are so eager to learn what it takes to design a boat, although at some point Im sure I'll regret having opened this particular can of worms <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />
Just so no one is without doubt, RG just posted this to show what my boys think and want and its a long way's yet from something I'll let them start building, none the less, its a hell of a good start.
Aerynt

The part I missed saying in the previous post is perhaps all of you who have kids should also get them involved in this, it is after all their boat and what they will sail and much to my amazement, they actually know exactly what they want, all they need is the technical help to make it happen.
As John my 7 year old observed after he looked at this forum (with lots of reading help from me) people sure write a lot and do very little.
Aerynt

Chris,

Earlier when you posted initial drawings of your F12 design you suggested a crew weight of 55-60kg. The weight data here suggests that that would make it perfect for the 12-16 y.o. range. Is this still your thinking or have you modified the design for the sub-12 y.o. market?

Seems my boys are shy when it comes to getting an account here so Ive been substituted in their place. This is a partial list of things they think they want, some I agree with, some I don't, but their reading skills are good enough to know if I leave anything out <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" /> These are in no order, just pages of stuff Ive been asked to sort through.

sails, they want to be able to use windsurfer rigs so they can match the sail to the conditions (probably because we have several windsurfers that they can utilise)

John mentioned thats its easier to plug in a windsurfer rig horizontally than a sail on a mast into a tube (probably higher than he is right now) in any wind.

Boards mean point and you always have to win, no matter who you sail against or when.

Reverse bows are just "sharp" <= cool> plus a lot of the A-Class have them

the mast brace can use the hawaiian boom clamp for a windsurfer rotated down 45 degree (had to look that one up)

end extensions for a windsurfer boom can be used for variable rake with different sails (on the braces)

braces can be mounted on hull with additional windsurfer mast steps

the above means you can rig the boat in wind and then just pull the rig up into the brace clamp

they want adventures, like sailing to some of the local islands to camp (haven't agreed to this yet) and want to be able to take the mast down easily, or the sail (something they can't do with the PT, mast that is)

Rig you can take down is good in emergencies, not something that is easy with a pocket luff sail

OK, enough for now, you get the idea that they haven't stopped thinking for the past 3 days

Aerynt, Michael & John

Yes, it is called styling.

If some-one can design the construction of this hull to be performed by an amateur in 100 hours or less then I propose merging this hull shape with my rig setup.

Wouter

I think the costs may well be very acceptable, take a look here :

http://www.xs4all.nl/~whijink/F12/F12_weight_and_cost_push_rod_setup.xls


Of course keeping building cost as low as possible was one of the design goals. Had to cut a few corners here and there to get down to the current cost estimate (leading to clunkyness) but if your walleet is up for it then these corners can be put back on.




Feel free to do so, just note that I didn't sit down on an afternoon, drew some lines of a piece of paper and called it a F12 design. There are very good reasons why the design looks at it is now. And the fact that I'm working on a deep V-ed hulls have again very good reasons, mostly simplicity in homebuilding by an absolute amateur. The latter is important to get the class started worldwide.

Currently I'm working some more on the unstayed rig. I fear camber inducers are necessary if I we are going to used fully battened sails on this craft. Something I really want and probably need unless we want to put the ugly laser rig on the F12. Talking about styling.

Wouter