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Old 30-04-2020, 05:56   #1
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spinnaker question

I am looking for details to find out what size spinnaker I need for a 50 foot Voyage. It's 27 ft wide. It pulls up to 53' from pulley to beam. Thank you!
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Old 30-04-2020, 09:57   #2
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Re: spinnaker question

For a 50ft voyage a paddle would probably do.

What kind of boat?
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Old 30-04-2020, 18:04   #3
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Re: spinnaker question

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Originally Posted by Adelie View Post
For a 50ft voyage a paddle would probably do.

What kind of boat?
Is that a serious Question? I took from the fact the the OP had capitalised Voyage and that he had posted in the Multihull forum that he probably meant 50 foot Voyage Catamaran.
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Old 30-04-2020, 20:25   #4
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Re: spinnaker question

Herre is some rough guidance to get you started....

For an asymmetric or symmetrical spinnaker on a cat I like the sail luff to be two or three feet shorter than the length from the prodder or bow attachment point to the hoist pulley on the mast. With this dimension the tack of the sail when flying will end up 6 to 8 feet above the deck giving good visibility ahead under the sail. So for your boat 53 -3 = 50 feet.

For a symmetrical spinnaker starting point let the foot of the sail be about half the luff distance above. So (53-3) * (53-3)/2 * 0.8 form factor = around 1000 sq ft.

For an asymmetrical to fit nicely the clew location must be placed so there is a fair lead to the sheet block. Sail makers will have nice modeling software to help with this. You can use trigonometry to get a starting point.

Without doing any math I am thinking your boat could carry around 1000 to 1500 sqft total in an assyemtrical. For carrying in higher wind offshore I would want a second smaller spinnaker with a slightly shorter luff and much narrower foot, the net result being say 600 to 1000 sqft max.

Hopefully this will get you started in the right direction. Consulting a sail maker could be very beneficial in getting a sail that will fly nicely.
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Old 30-04-2020, 20:29   #5
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Re: spinnaker question

Quote:
Originally Posted by Factor View Post
Is that a serious Question? I took from the fact the the OP had capitalised Voyage and that he had posted in the Multihull forum that he probably meant 50 foot Voyage Catamaran.
The paddle comment was a joke.

The asking about the boat make was serious since I couldn't find it on SailBoatDatabase.com.

The OP is a she not a he.
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Old 30-04-2020, 20:39   #6
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Re: spinnaker question

As a reference, our boat is 50' x 27' and our spinnaker block is 16m (~53') above the crossbeam at the bow. Sounds pretty similar. Below is our big asym. We love this sail up to about 15 knots AWS. It generally flies high enough to see under, although in very light air (<5 knots and deep reaching/running) it can droop enough to cause vision problems.
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This is probably the biggest sail I would like to fly on this boat. Our arsenal used to include a 100m2 (~1000ft2) continuous furler sail to complement this one, but we destroyed that sail one day and the bank account hasn't yet wanted to replace it. I do miss that sail as our next step down is to ~60m2.
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Old 30-04-2020, 20:42   #7
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Re: spinnaker question

Correcting a geometry error:

For a symmetrical spinnaker starting point let the foot of the sail be about half the luff distance above. So (53-3) * (53-3)* 0.8 form factor = around 2000 sq ft.
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Old 30-04-2020, 20:46   #8
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Re: spinnaker question

No wait a minute...I had it right the first time...1000 sq feet.

I should stop now.
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Old 01-05-2020, 08:06   #9
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Re: spinnaker question

Yes voyage
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Old 01-05-2020, 08:07   #10
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Re: spinnaker question

Thank you!
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Old 02-05-2020, 08:24   #11
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Re: spinnaker question

We build a lot of after market multihull spinnakers. The areas depend on if asymmetrical or symmetrical, if tacked
on a bow sprit or to blocks on the bows, and if a runner or an all purpose design. I have files for a Voyage 47 but, not the 50. In any case, if the max straight line luff is 53' I estimate around 1,400 sq. ft. for an all purpose asymmetrical, on a bow sprit, used with an ATN type sleeve.
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Old 10-05-2020, 05:41   #12
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Re: spinnaker question

Email the factory: info@voyageyachts.co.za - I am sure they will be able to give you all the specs you need.
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Old 11-05-2020, 08:50   #13
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Re: spinnaker question

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Originally Posted by davecalvert View Post
We build a lot of after market multihull spinnakers. The areas depend on if asymmetrical or symmetrical, if tacked
on a bow sprit or to blocks on the bows, and if a runner or an all purpose design. I have files for a Voyage 47 but, not the 50. In any case, if the max straight line luff is 53' I estimate around 1,400 sq. ft. for an all purpose asymmetrical, on a bow sprit, used with an ATN type sleeve.
I believe the Voyage 50 is a Voyage 47 ( actually the Mayotte) with extended sterns.
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Old 11-05-2020, 10:26   #14
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Re: spinnaker question

We had Dave Calvert build our main and jib for our TRT 1200. They are absolutely beautiful, first new sails Ive had built that I didn’t have to send back for a recut.
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Old 11-05-2020, 17:09   #15
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Re: spinnaker question

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Originally Posted by smj View Post
We had Dave Calvert build our main and jib for our TRT 1200. They are absolutely beautiful, first new sails Ive had built that I didn’t have to send back for a recut.
Yep, Dave has made some well-built multihull sails over the years for me as well.
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