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What model is faster Mark2 or Mark3? with same sails?

I have not yet rigged the two exactly the same and tried. My hunch would be the MkII, based on the experience I have had so far.
When combined, the three hulls are equal in displacement as the monohull MkII.
But the MkIII really hugs the surface water, so there is little heeling. There is more lift, less drag when a MkII heels.

The MkIII has just been developed, the trick with the design was coming up with a main hull and amas that had enough buoyancy and generate lift on the forward end to counteract the “nose-diving” thrust on the hull from the sails. The last model I made (the trimaran with the blue and yellow sails seen on homepage) is quite fast, yet I know (after the fact) that the model can handle more sail area.

Although the MkII may be a little faster, the MkIII can handle sailing conditions that the MkII will not.

I like the way you show how to shape the keel.
My model is now much faster after I made it smaller and put some shape to it.
What is the best way to make another keel?

I recommend using a strip of untreated cedar shingle, it already has a taper, you then just have to smooth it down, cut to length, and fair it into a foil. Other woods will do if its sealed.
If you have a bench sander, take a strip of wood a little more than a 1/4" thick (and longer than you need, about a foot long) and grind away on the surface on one end, until you get a level taper that will wedge into the well. (Let the wood drag along the sanders surface.) Then trim off the ends and fair it in. A belt sander will also work if you secure it in a vice somehow.

Can you give me some idea how much sail a MKII can carry because I would like to try the sort of sail you find on a Dhow at present a single sail comes out at about 600 cm squared that is about two thirds of a square yard that seams an awful lot of sail can a MKII cut it?

That would be a heck of a lot of sail area for a model that is only 16in. long (:-0
Keep in mind our models are un-balasted centre-boarders,
 too much sail area will garantee a knockdown in no time...
 the largest single sail, I rigged on one was aprox 98 sq inches and a lateen at that.
See the article called "Extreeme Lateen"
http://www.seadercraft.com/boats.html
About a foot and a half sq. would be tops. for a MkII

i am a student at CAMS and have to build a sailboat. i was wondering which would be better to use? - plastic or wood? for the base? i am limited on what i am able to spend. (15 dollars max) i need to learn about sail boats and if the mast material should or could be a plastic sheet cut to size?... can anyone help? PLEASE!!!!!

I would use wood every time as it is easier to work with and as for the plastic mast forget it it would not last two seconds I intend to use a metal tube as this will enable me to do away with most of the standing rigging associated with most yachts.

Hiya,

  looking at the lateen rigged model on this site, I was wondering if you could explain to me how it changes tack? Do you have to bring the spar vertical and then raise it on the other side of the mast?

  Many thanks,

Paul

I am afraid I do not know. What you suggest might work
but only if the spar is set right which is dependant
on where you set the mast you must be carful not to
set it too far back or the mast will extend to far in
front for you tilt it up and swap over. You could
ofcourse just try changing tack without swapping the
spar might work.
--- QT - Paul <qtopic+23-RQSj4WySG2c@quicktopic.com>
wrote:
>
>

Regards
Stuart
mansfield_marauder@yahoo.co.uk



Send instant messages to your online friends http://uk.messenger.yahoo.com < replied-to message removed by QT >

Re:Lateen sail. . . You don't have to 'dip and switch' when changing tack, although the sail will preform better when the spar is on the leeward side of the mast, there is not that much difference. When I go for a sail, I set up the lateen rig to suit the prevailing wind, so that the sail is set on the leeward side, most of the time.