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Does anyone make a tabernacle for a Mk V?
My cruising area (Rideau Lakes) doesn't have a mast crane on it anywhere, all the marinas just cater to powerboats.
I'd love to find a way to make a Mk V mast selt-steppable. I'd be willing to engineer a solution but pointers much appreciated.
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Hi. I have never heard of one, but I too would like one, and am thinking of jury rigging one.
I wonder if one could sandwich the mast base with two 1/8 inch thick aluminum plates, perhaps 14 to 16 inches high. These would have a rubber material mast side to protect the mast and stop it from sliding. They would be clamped to the mast with 3 bolts fore and aft. At the bottom rear of each plate there would be a hole through which a short chain or cable would attach it to the mast step (to the holes where the halyard blocks normally attach). To raise the mast, the spinnaker pole would be used as a gin pole (with both the mast and the spin pole being stayed with lines to prevent sideways movement. A winch (kind used to winch small boats onto trailers)would be fastened to the anchor roller frame, and its cable would fasten to the bottom of the foreastay (which would be fastened to the end of the gin pole), and up it would go.
One would want to have an engineer friend double check the strenght of material, but I think it would work. One concern I had is that as the mast comes up there would be an upward pull on the mast step, vs. the normal downward pressure, and I would want an engineer friend to check that too.
Thoughts?
Barry Oasis 1987 Mk V
<A href="http://s3.photobucket.com/albums/y57/tanzertanzer/?action=view¤t=DSCN2622.jpg">http://s3.photobucket.com/albums/y57/tanzertanzer/?action=view¤t=DSCN2622.jpg</A>
Hi, this is a pic of my last boat, a T31, with a Cinkel mast, same as the C&C 27 MV. It was possible to unstep the mast without using of a mast crane. A kit of blocks and rope with 2 poles ( about 12 feet long ) came with the boat and was used to act as shrouds when you unstep ( you can find on the Net the way to install them i guess ).
But ....... the mast was 40 feet long .... weight a lot ..........i'd never tried....
On the C&C 27 MV, the mast is shorter but quite log and heavy too......
I don't have closer look of the tabernacle, but there is a vertical slot of about 1 inch to provide space to lift a bit the mast before drop back. On the mast itself and inside where the bolt pass trough, there a profile ( aluminium pipe ) who reinforce the side of the mast ( to not collapse when you tigh the bolt)
The tabernacle is easy to do, but you have to modify the base of the mast to install the profile.
Hope it can help you a bit
Good luck with your project,
Jean Rivest
C&C 27 MV "NEOGA"
Sorel-Tracy, QC, Canada
Wow, that looks ideal.
Is this a part I could acquire? I am not afraid of the modification if the result is proven...
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Don't know where you can acquire some parts. I think you will made them from raw material ( aluminium pipe and plate etc ) For the result, it depend on many factors like how many people are you to do the operation, would you do the maneuver a lot of time during season, do you have a furler ? etc. Like i said earlier, this mast is tall , not like a mast from a Tanzer 26 for example, this is a boat you can easely unstep the mast by one person in half an hour , because you don't need to remove shrouds before , just give some slack ..! <IMG src="http://www.cc27association.com/f3/toast/emoticons/icon_wink.gif">
If you intend to do the operation alone.... hummmm... i have some reserve ( a lot should i say ). And yes advice from an engineer should be a good idea ...
Anyway good luck in your search and project....Jean Rivest
C&C 27 MV "NEOGA"
Sorel-Tracy, QC, Canada
An engineer... strangely enough I happen to be one actually.
Does anyone have the specs for the mast?
Total length, total mass...?
Maximum safe tension on the forestay hardware?
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Love free advice from engineers!
Mast is 35.5 feet long. I don't know the weight, but estimate it at 150 to 200 pounds. Forestay is 7/32 inch 1X19 stainless steel wire. Specs list rear stay as same material and dimension with breaking strenght of 6300 pounds.
I don't have measured length of spinnaker pole (gin pole), but estimate it at 12 to 14 feet.
That is the info I was able to glean. Is it enough for your calculations?
Looking forward to hearing from you. Barry 1987 Mk V Oasis
Well, as far as "design", I like the A-frame technique used on the Tanzer factory mast raising kit.
Some details here, basically the last for entries on this page...
http://www.bora-bora.net/tanzer-spec00.html
So the height of your A-frame ends up being around 8 feet or so, but might be different on a C&C. They have to be whatever length brings them down at the front shackle.
So with a Tanzer 26, that mast is 33 feet high from the waterline, so obviously a bit shorter than the C&C.
However, the A-frame would be straightforward to fabricate, and as long as it was tall enough, the angle would make the loads tolerable on the tackle. (the Tanzer uses an existing jib or genoa winch, which might be usable)
So with some wizardry, it seems workable. The mast tabernacle would have to be fabricated or purchased, the rest would be straightforward fabrication. The triangle that joins at the front might require some aluminum welding, easily done as a walk-in walk-out at most welding shops.
Jean, you specifically mentioned the Tanzer 26, do we know if the Tanzer has anything else going for it that makes this rigging easier, other than a shorter spar?
Would be interesting to examine any other differences that might be showstoppers...
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Don't know if there is other way to do the rigging. I just mentionned Tanzer 26 because i know this boat and is very simple to step and unstep the mast. The mast is relativly light, the tabernacle have a pivot and the chainplate are locate at the right position so you don't need to remove them before unstep. My friend do it with is wife very easely. Just to attach the forestay to a rope who pass to a pulley ( attached to the forestay chainplate ). The rope goes to a winch. When the mast is about 30 degres fron horizontal, you can support the rest of the way down. It will be impossible to do the same thing on C&C 27. Don't forget that at 35 feet high, the mast will be 20 feet outside on the back with just 25 inside, that mean if you remove the ( let's say ) future pin on the tabernacle, you will need to retain the base of the mast , if not you will be in trouble a bit .....
For sure it's possible, but it's far from an easy solution i guess,
See you, Jean Rivest
C&C 27 MV "NEOGA"
Sorel-Tracy, QC, Canada
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