Tamble said..
Just out of interest, how do you do a change.
Can you pre-hank the new sail under the old one, ready for a quick hoist once the old one is down and cleared off the forestay?
Did they ever have twin, side by side, forestays? (although I can see issues with hanks fouling on each other unless the stays have a very wide separation)
We used to have a type of twin forestay. Over the wire forestay was a aluminium twin track. The track on the forestay ended abut 60cm from the bottom. All the slides on the headsails we stored on a "magazine" that had the same twin track profile as the one on the forestay and just clipped into the gap at the bottom of the forestay. When hoisting the sails the slides on the sail just slid up the magazine and onto the forestay. Dropping the sail was the same in reverse. Once down you just had to tie the slides off so they didn't slip off the magazine and you would pack the sail away in it's bag with magazine attached. I think from memory this set up was called "Kayzee" or something similar but can't be certain.
Changing headsails mid race involved removing the current (empty) magazine. Inserting the (full) magazine of the new sail and hoisting. Once up and sheeted, the original sail was dropped onto the (now empty) magazine and removing it from the forestay to be stowed away.
The system worked quite well. The compromise was around folding the sails. Having the slides still stored on the magazine didn't make for the neatest fold.
This system has since been removed (can't recall why) and we now just have a regulation forestay with hanked headsails. Personally I quite like the hanks for their simplicity, ease of use and having less to go wrong. As some have noted it is still possible to effect a fairly quick sail change with hanks. We tend to get the new sail up and hanked on in between two hanks of the sail in use and sheets ready to go. Drop the existing sail and remove the hanks and swap the halyard to the new sail. Then up she goes. With a bit of practice the crew gets quite efficient with this process.