Flying jib/ jib topsail,

I presume you mean for a fractional sloop?

I have asked this question before (got no response) as there are photos of Roach with one set in the 50'2. The sails are shot though and I am not going to replace until after some experimentation.

I presume they do help in light winds, specially on yachts sailing in rivers.
 
I understand that they are not quite the same thing. A jib topsail is set on the topmast forestay, but very high up.
A flying jib is the outermost of several jibs, set from an extension of the jib-boom, itself an extension of the bowsprit.

For light winds in rivers a topsail set above the mainsail gaff gives the highest sail to stand the best chance of catching the wind above the trees.
 
Jib Topsails are wonderful at powering up the (main) topsail; particularly reaching. I've got one on the boat, although rather improvised, and it don't half make the boat shift!

As i understand it, a Flying sail is one set up without attachment to a permanent stay - eg a jib on a cutter rigged gaffer.

Thus a flying jib topsail is one set above the jib (itself maybe set flying), and attached as high up the topmast as possible.

As you can imagine, it is 'entertaining' handling a flying jib topsail; akin to handling an assymetric spinnaker.
 
91319423d8b83d7218a5693f48e2e9662e475498a5a13c164330526df34eeb49f8389428.jpg


Something like this you mean?
 
Well, a bit like this:

CleoneandDevonsm.jpg


And it's only really useful in light to moderate airs, and then only on long tacks. The halyards and outhaul are premanently rigged, and the sheets are specific to the sail and are stowed with it. Close tacking a bit impractical as the cockpit fills with rope!

Warning. Always have upper running backstays to the top of the mast supporting it, as watching the top of the mast bend forwards will loosen the sphincter faster than exlax...
Looks fantastic though.
 

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