David Tyler wrote:Jeff,

I scaled down the Raven 26/Fantail sail to 209 sq ft/19.42 sq m, and got a batten length of 4 metres, a yard length of 3.1 metres, a boom length of 3.8 metres, a mast height above deck of 5.8 metres, and a distance between the mast centreline at the deck (the mast is raked forward 6 degrees) and the bow in the range 1.2 - 1.4 metres, depending on the Centre of Lateral Area of the Silhouette (which I don't know).

David.

David,

Thanks for the information, I am good at making thinks, but not at working things like this out.

Regards   Jeff.

David Tyler wrote:

Jeff Neale wrote:

HI, Help. I am trying to work out  how to junk rig my  boat, & getting lost in all the jargon.

She is 17ft long,

 Where do i fit the new mast ?.

How much sail area ?.

What sail plan.

I need it to be very easy to use.

Thanks  Jeff.

 

 

 

Hi Jeff,

You'll need at least to borrow a copy of Practical Junk Rig, the book that we all keep referring to. It contains every last thing that you need to know to design, build and sail a junk rig. That will tell you about the factors concerned in positioning the mast.

I see the the Silhouette mk3 has a sail area of 209 sq ft in her main + genoa, and that would be a good starting point.

Having sailed Fantail several times now, I'm very pleased with the way this design has worked out, with the forward raked mast and fanned sail. I would favour it for all boats up to about 28 ft. Photos in the photo gallery, and a sail drawing in "Your online file storage/Drawings/David's doodles". It can be scaled down to 209 sq ft very easily, if you like it.

HI  David,  I will look into that now.

Many thanks  Jeff.

HI, Help. I am trying to work out  how to junk rig my  boat, & getting lost in all the jargon.

She is 17ft long,

 Where do i fit the new mast ?.

How much sail area ?.

What sail plan.

I need it to be very easy to use.

Thanks  Jeff.