Replacement masts

[Greybeard]

My only concern with that, Jorgen, would be the tremendous strain it would put on the mast pivot bolt, or more exactly, the timber of the mast when the mast was near horizontal, due to the short length of mast below it and the limited leverage it would have. Possibly a steel collar fitted around the mast at the pivot point would help take the load? I suppose that if it were used purely as an assistance to the person lifting the mast, it could work.

Steve

[oak]

Interesting suggestion.Bit more to go wrong?
Have you seen the boats on the Norfolk Broads?
They put a counter weight on the bottom of the mast for very fast and easy lowering.Keep meaning to look at it.

May be in same in the Netherlands but I have not noticed
Oak
Just about to lift mine,think I will use the tractor .

[Timbre 19]

Hello. And thanks for your comments "oak" and "greybeard". Yes, the idea with a 12V winch was no good.
The Strain becomes too high. And no electricity is to prefer.

So I start thinking from beginning again and tried to avoid the original rising method, three things I don´t appreciate:
1. The Bowsprit involvement ( too much settings )
2. The weight of the mast becomes so evident in the beginning ( aging Captain ! )
3. You stand under the Load ( one can slip)

It resulted in the following:
You make a "mast mate" (total length 0,97 m.) connected to the mast with a band-winch in the very front.
The connection of the mast mate to the mast consists of a pivot bracket just below the mast pin.
And the forestay connects just beyond the winch temporarily during raising/lowering. Have made an outdoor test and it
works very well. Safe, quick and fast. Moreover, I think that the Forestay will get a Pelican-hook instead, makes it easier
and save time. The Mast mate can be on the Mast during trailing. Even plan to trailing with the Mast fixed in the Tabernacle.

Regards / Jörgen

[oak]

Jorgen,
Thats looks absolutely brilliant.Having changed my SA mast for an Honnormarine the extra weight means that I can not cruise beyond the neatest bridge.
Do you think that you may have problems with side loadings as there is no side support.
I have seen alternative fulcrum poles but nothing as orignal as yours.
I used my JCB this year!
Oak
Merlin

[oak]

Jorgen,
One other question.
Do you have any concerns regarding the fixing of the unit to the bottom of the mast.Can the screws take the load?Can the mast foot?
Oak

[Timbre 19]

Hello and thanks for interesting comments.
For the first: What is a SA mast and what is JCB? My language isn´t yours, hope you understand.

About side support: Under test I noticed that when my right hand was cranking the Winch was it easy to sidecontrol
by grabbing the Staysail halyard by left hand. For you stand very firmly there on the deck.

About bottom Tabernacle: Good point! Haven´t thought about that. The opening for the Hatch makes the Deck weaker here.
I will study this and maybe make a support.

/ Jörgen

[oak]

Jorgen,
Didn't realize that you had a wooden boat.
SA stands for South Africa where my boat was built.The original mast was made in sections but my new mast from Honnormaine is almost solid so much heavier.

JCB stands for J.C.Bamford.you know all those yellow diggers.I have a 3 tonne tracked digger with which I hauled the mast up.
Keep up your original thinking
Oak
where do you sail?

[Timbre 19]

Hello again Oak,
here comes some more about "Mast-tubes":

A solid 100 mm Oregon Pine Mast (density 0.55) weighs about 25 Kg (only wood). If you follow Dix Design original
Mast dimensions with 100/75 mm and Oregon Pine (density 0.55) you get about 11-12 Kg.
I was not brave enough so my Oregon Pine Mast is 100/56 mm and weighs just under 18 Kg.
Compare that to an Aluminum tube 100/94 mm and density 2.7. Then you got 14 Kg.
Interesting I think, the Original Dix Design seems to be the best in the case of low weight!
Do anyone know the weight of a suitable Carbon Tube? I don´t.

Where I sail in Sweden? Lake Vänern and Skagerack+Kattegatt mostly so far.
(Once I participated a sailing to Lerwick, Fair Isle and Kirkwall. An experience for life.)
With my newly home-built CC19 + Trailer can I even choose waters closer to home.

Jörgen

[David Peck]

Mast and Rigging Weights

Hello Jorgen.

The following may be of use:

The following weights, just measured, may be of interest for comparison purposes.

1. My carbon fibre mast with 3,5mm Oregon Pine veneer, mast head light and wiring, all fittings including all the blocks and shackles weighed;

= 10.90Kg

2. The standing rigging (wire rigging) weighed:

= 2.4kg

3. The running rigging (all halyards, topping lift, and shackles) weighed:

= 3.2kg (dry)

4. The Honnor Marine solid wooden mast with fittings (rigging band and tangs) weighed:

= 36.30kg

The carbon fibre mast with just rigging band and tangs, pivot bolt tube (as 4 above) weighed (from memory):

= 9.50kg

From the weights given above you can see there is a tremendous difference between the solid HM mast and a carbon fibre mast. So far, I have always managed to put the carbon fibre mast up un-aided. Taking it down is even easier. With the old solid wooden mast it often took three to get it up onto the boat and raised. Now I can carry it about easily.

Obviously the with the rigging the weight increases especially if the ropes get wet but for me is just manageable. I am considering making a tension device that makes that critical point (about 45 degrees-when you have to move forward on the coach roof) just that bit easier. It would be attached to the trailer but can be modified to use on the just the boat for “bridge Lowering”.

The reason for making a carbon mast was to off-set the extra towing weight of my inboard diesel but it also makes the boat now much stiffer! It’s a shame that HM didn’t continue to make the hollow “Bird Mouth” South African original design instead of just copying the Shrimper. Simon Head had one made in the UK in Bristol.

Hope the above helps.

Regards
David Peck
CC94 Whistling Rufus.

[Timbre 19]

Hello David.

Thank you for your comprehensive response. At last, numbers pointing the right way! Because if I understand right weigh your mast altogether
10.9 + 2.4 + 3.2 = 16.5 Kg. Then I understand that it goes easy. What a difference.

As I mentioned earlier, my mast weigh 30kg in total. It includes the extra mastband for the Forestay, but it may only be 0.3 Kg. Found a carbonmast really intersesting with its low weight. What kind of pipe is it? Thickness? How thick are OP veneer? Was it difficult to build? Many questions, but it engages.

Regards Jörgen

P.S. 14 feb.2018: The following post signed by me that showed a launching system have in recent days attracted the interest by a manufacturer.
For this reason, I am asked to remove the displayed material in the form of descriptions, photos and drawings. Thank you for understanding / Jörgen.