A new mast for The Lady Caroline?

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Rational Root
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A new mast for The Lady Caroline?

Postby Rational Root » Wed Jul 27, 2016 2:03 pm

The first mast I built for my Glen L 14, was sadly, somewhat crooked.

It's come time to resolve that.

I did choose to use an alloy mast track, rather than a bolt rope, which makes it nice and easy to raise and lower the mast.
And I think I will do the same again.

The design calls for a 2.5" x 3.5" mast, but this allows for the groove for the bolt rope.
Now where you feed in the bolt rope, the mast is cut back to 2.5" x 2.75" to allow the rope to be fed.

If 2.5 x 2.75 is strong enough here, it seems that the rest of the mast could be the same if I don't need the bolt rope groove?
I would imagine that I could build the whole thing to 2.5" x 2.75". Now that would be a good bit lighter?

Any thoughts on this?

Does anyone has a round wooden mast?
What diameter? is it hollow?

Thanks
Dave
Hey! I built a boat ! No Really, I did !
http://davesboat.blogspot.com/

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Bill Edmundson
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Re: A new mast for The Lady Caroline?

Postby Bill Edmundson » Wed Jul 27, 2016 3:25 pm

Dave

Some our people have made their mast round and hollow. They use multiple strips with bird nest joints. Something of a round plywood. I'm sure you could come up with a way to run your halyards up the core.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
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Rational Root
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Re: A new mast for The Lady Caroline?

Postby Rational Root » Thu Jul 28, 2016 1:31 pm

It turns out that a birdsmouth would use MORE wood than just making it from two halves, and hollowing out the middle.
The standard sizes that wood comes in are just the wrong size, I'd need to get quite big pieces and machine away a lot of wood.
It's almost certainly going to be rectangular, 2 piece, doug fir, and hollow.

But I'm hoping I can go with 2.5"x3" instead of x3.5" since I don't need the bolt rope groove.

D
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Rational Root
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Re: A new mast for The Lady Caroline?

Postby Rational Root » Tue Aug 02, 2016 1:00 pm

There's a video of me lowering the mast on my Glen L 14, with the small stand under the stern to stop her tipping up as I walk aft when she in on the trailer...

http://davesboat.blogspot.ie/2016/08/lowering-mast.html

The stand is just a hinged tripod - an a frame and an arm - with a cord and cleat to prevent it from opening out flat and collapsing.
Hey! I built a boat ! No Really, I did !
http://davesboat.blogspot.com/

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Rational Root
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Re: A new mast for The Lady Caroline?

Postby Rational Root » Wed Aug 03, 2016 2:54 pm

The DM4 aluminium mast seems to be very strong

The stiffness is
Ix = .548 in^4 ~ 30.46 cm ^4
Iy = .732 in^4 ~ 22.81 cm ^4

The selden mast for the flying dutchman (selden's strongest dinghy mast section) is
Ix = 27.1 cm ^4
Iy = 16.9 cm ^4

Is DM4 way over specified for the Glen-L 14?
Could I use the Selden mast section?

Thanks
Dave
Hey! I built a boat ! No Really, I did !
http://davesboat.blogspot.com/

mnanfito
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Re: A new mast for The Lady Caroline?

Postby mnanfito » Wed Sep 14, 2016 3:16 pm

Which mast did you end up using? Dwyer Dm-4 or the Selden?

--michael
- Michael Nanfito

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Rational Root
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Re: A new mast for The Lady Caroline?

Postby Rational Root » Sun Sep 18, 2016 1:26 am

I still have the bent wooden one... No real decision...
Hey! I built a boat ! No Really, I did !
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