Thread: Is that a 12' GIS I see hull down on your horizon

Attachment 215977
How about NO mast? Power the thing with a kite.

Originally Posted by tpb03

As for wooden masts, how would a length of construction grade radiata pine go for a one piece.
snip
I just don't know about the strength given radiata tends to be brittle.

I sure hope radiata is strong enough because my hollow box GIS mast is made of it. We'll find out if ever get the thing out on the water and into the wind...

Originally Posted by Boatmik

Simply move the back face forward and put 4mm ply across the back ... simple saw cut up the middle of the ply.

Might be tough to seal the channel in epoxy (assuming...). Also, the resulting cut might be tough on the sail, but easing those edges will be tough if the ply is already assembled. Maybe the right router bits can fit into the channel and ease the interior edge, but that's a long slot. And it might be a lot to expect from a homebuilder to have a router and the right bits.

Maybe those ply shoulders can be ripped to size first, and attached to the back face of the mast afterward. That would allow for sealing all surfaces and could provide for more opportunity to reinforce the mating surface for the shoulders.

...that is, if you go with homebuilt wood

Radiata with no knots is not too bad for spar making. But my spar designs do compensate for it a bit.

The solid mast for the goat is quite over strong. And the built up square hollow masts are a way of spreading out any potential defects because they are made of so many pieces of wood.

I'd be a little bit aware making yards and the thinner booms out of Radiata but a good piece should be fine.

MIK

Dave ... you have listed my concerns rather nicely! I'm nutting it through.

Maybe I'll accept that the edge won't be sealed and every few years the ply planed off and some more glued on. With reasonable ply I am guessing it will last much longer than we all expect.

And with epoxy gluing any damp won't get into the rest of the structure.

thinking
thinking
MIK

The gaboon plywood has arrived, I'll be tracing out the parts this evening. News at eleven.
Rick Landreville.
Rosedale B.C. Canada.

11:00 in whose time zone?

No pressure; you only have a global community of builders waiting on your every cut... Good luck!

Karen Ann's mast is a square hollow-box made of radiata - so far I've had no issues with the mast. The plantation grown radiata is knot-free and straight. Inexpensive, too, $80 for the materials.

Originally Posted by davlafont

11:00 in whose time zone?

No pressure; you only have a global community of builders waiting on your every cut... Good luck!

11:00 pm Pacific time.

Layed out all the plywood for the sides, bottom, airtanks, centrecase, bulkheads and transom.

Total time: 1:45.

Tomorrow I will cut out the parts. I have neighbors who work shift, so the noise from the saw and sanders will bother them...

Rick Landreville

Very quick progress indeed! Not that I expected anyting less (adding a bit or pressure here ).

I for one will follow this build very closely and am very much looking forward to seeing her lines in reality.

Best of luck in the build and wishing you fun in the consequent testing sessions!!!

Joost

So..., were any cuts made and did the neighbours get a bit angry with you?

I just got back from a weeks holiday expecting to see some progress. Actually in true Rick fashion, I expected to see a completed hull! Pics please or it doesn't exist!

Rick was half camping and half celebrating a new arrival in the family.

Originally Posted by Boatmik

Rick was half camping and half celebrating a new arrival in the family.

Wow, nice truck. Legitimate excuse. I forgot that it is part of the 3 week window that Canadians can claim as summer!