Lets see if I can explain this...
Some boats are designed to have the Genoa work outside the shrouds, whilst others are designed to have it work inside the shrouds.
At the same time, some boats have an open pullpit (correct name?), while others have a closed one.
Lets start with the open pullpits.
On open pull pit bows, the sail can work either inside and/or outside the lifelines, depending on the tack, and the open pull pit allows you to move the sail out. Why? some of the performance boats have the foot of the genoas so low in the deck that they could never work outside the life lines unless there is an opening forward to allow it to be moved outside, however, as they sail under certain conditions one might need to move the sail to the outside of the life lines.
Here you can see an open pull in the white boat, and a closed pull pit in the blue boat.
Bellow is a photo of a boat that has an open pull pit to allow the sail to be on the out side for reaching. As you can see the sail is outside the life lines.
The next photo shows how an idiot bowman that does not pay attention, allows the sail to be half in and half out. It is obvious that the sail "wants" to be outside the life lines here.
On the next photo, the same boat, this time crewed by inteligent people, has a different sail, that is much lower in the deck, and this time the sail is "working" inside the pullpit.
A closed pullpit, normally has the genoa work "above" the pullpit, to clear the life lines, and that can work on both the inside or the outside, as seen bellow...
or if the genoa foot is bellow the top of the life lines only works inside the life lines and when it needs to open more, it is "forced" to be bent over the pullpit to work outside the life lines. This happens often and I see it a lot. Nothing wrong with it, other than slight damage to the sail, but it has to be done.
Conclusion; To have a lower foot sail, like in fast boats, you need an open pullpit, or if you have a closed one, you sacrifice sail area by raising the foot above the life lines, or if the foot is low, sometimes it is foreced over and damages the sail. All good different options, chose one. Was that understandable? My English poses a problem with names sometimes, hence the photos.
Now, as far as the genoa working inside or outside the shrouds. This is more complicated..
The difference between genoas working inside and outside the shrouds.
Some performance boats, due to rating constraints and to be able to point higher, depending of the objective of the boat, as for racing, for example, need to have shorter foot and tack genoas, so that the sheets can work inside the shrouds.
This allows the tack to be nearer to the mast, closing the angle between the relative wind angle and the sail's angle of attack, allowing to point at lower angles before the genoa stalls (flaps), closes the gap between genoa and main, which works like a SLAT on an aeroplane, and accelerates the air on the leeward of the main to increase lift (pull), and also allows to have smaller genoas favoring the ratings.
These sails, obviously are limited to genoa sizes (bellow 115% to 120%) otherwise the leech touches the spreaders. (some boats, to allow a "bellied" leech, to increase sail area without affecting the rating, have curved spreaders, that allow the genoa to be brought almost to the spreaders).
Here bellow is a photo of "swept forward" spreaders. Nice!!!!! (G)
So, in this case, the sail has a smaller foot and tack, and can have the sheets work inside the shrouds. To allow for that, the genoa tracks are installed as much as possible to the center of the boat (which in this case was what limited the width of my boats cabin), having a limit there too. I also use barber haulers to help bring the tack even closer to the mast, but forget about it now, I already wrote too much...next time.
Here is a track that works inside the shrouds. As you can see they can be pretty small.
Other boats, normally on cruising boats, because performance is not a demand, these boats have larger genoas, often above 125%, and up to 150% or more and therefore, because the leech would touch the spreaders, the sheets have to work outside the shrouds. In these boats, the tracks are further aft, and are considerably larger, sometimes going back as far as the trasnsom. Or thru blocks attached to the toe rail, that may or not be adjustable back and forth.
The sheets come from the sail, thru the track then to a block aft, then into winch, as for example in the CS 36, or straight from the sheet into the track and into the winch.
Hope this was undertandable, if you have any more quastions, its gonna cost you!!! (G)
Later on I will try to post photos of the larger genoas and the tracks..gotta go now...