I can't comment on Snalberski's point I have not used another board...
..
Sector 60 mods for adding a foil...
First up have you read this post ..?
www.seabreeze.com.au/forums/Kitesurfing/Foiling/Airush-Sector-V3-60-with-foil-wing?page=1GeoffD suggested 370mm back from front foot strap settings. Lets call this start screw hole the Datum.
My board a V1 is 1760mm long. 5.2Kg without the foil setup attached.
The build
The tracks (Slingshot) are 250mm long - the tracks are 360mm back from the Datum, so 360 - 610mm back.
The pictures show the set-up and the current position I use for the mast. (I have added 1 picture at the bottom more in my gallery).
Mast position.
In the picture the front of the mast is 445mm back from the datum. I started as far back as it could go which is 23mm
further back. I also had shims on my stabiliser to stop the foil lifting too much for few sessions.
I could move the foil forward by another 20mm there is a lot of space to move your feet to balance the board. The front
foot hooks are as far forward as they can go, when I am cruising and (fairly) level I often am not touching front or back foot hook.
The SS plate has 8 screw holes if your plate has less say 4, but room for more without weakening it then do this to
give you a bit of movement with mast position.
My wing (Infinity 76) is big and I liked the idea, when positioning the tracks in the board, of being able to move front
foot position forward as I pick up speed, so I have biased my mast position towards the back of the board. I can move
the front foot hook position 120mm further back.
So if I had to fix the mast in one position I would have it as per picture, there is enough room to re-adjust foot
position to allow for different wings. If possible, I would have another set of holes in the base plate to allow you to
have movement of about 20 mm forward.
Pros... So it is heavy-ish but g8 for very easy starts it has a lot of buoyancy and planning area - just not quiet
enough for stand-up paddling!! It tracks well without lifting off the water and is very easy to get just off the water
without feeling you are on the foil. There is a big length in front of the front foot straps (800mms!!) which has helped
for touch downs (heavy ones!!) without falling off. There is a lot of room to move your feet around to balance the board
so a slightly different foil mast positioning will not be a problem.
Cons... do not think it is easy to hold a big buoyant board in position to start it is not (my foil is heavy),
especially in lighter conditions. Once you get the hang of water starts you can to a large degree just go for it and
not fuss about top marks for your technique!! I rarely use the rear foot strap once I am up and moving just to help
hold the board on its edge to start. Be aware that this level of board buoyancy with probably most foils but certainly
mine gives the foil a license to use any surface waves / chop and motor off down-wind by itself - fine as long as you
have good kite power but in light conditions a real concern - I have a strap between the front foot hooks and a spare
leash to avoid this problem.
Other points..
Once I was up and fairly steady I rarely moved my feet off the deck grip area (black), but in the learning phase - I
ended up sticking a deck grip over all the edge between the foot hooks.
I am (very slowly!!) building a way smaller lighter board and this will have a fixed mast position. To avoid
compressing and damaging the sandwich layer advise was to pick-up carbon fiber tubes and epoxy them in - These are very
tough and surprisingly cheep.
Luck with the project.
Cheers
AP