How far from tail to put foil box?

[FloridaWindSUP]

I think I'm going to butcher my already-half-butchered 10'4 Angulo Surfa by putting in a track box for a foil mount. I'm calling it "half-butchered" because I already put a flat rocker section, step tail, and twin-fins on it to make it plane. https://jimbodouglass.blogspot.com/2014/01/sup-windsurf-modification-mufin-wave-fin.html That was fun for a while but now I'm over it. (Though it worked, the board was neither very loose on the wave nor very efficient at planing. I also have hardly any waves to use it in here in SW Florida.)

I'm thinking I'll route out the two finboxes I added in the last modification, and put them closer together and more forward to be the track box. I have a track base that came with my Slingshot foil so I think I can use that as the template to make sure I get the distance between the tracks right. (I've been windfoiling on my formula windsurf board with a tuttle box, but that board is 230 x 100 cm with the foil box very near the tail, and I'm pretty sure it wouldn't work at all for SUP)

I read that the distance from the tail to put the foil box on a SUP is dependent on the length of the board, but the guidelines that I've seen only go up to a board of 8'7 - 9'6 length, for which they say to put the center of the box 23-28" from the tail. I might chop off some of the tail and the nose to shorten my board down, though, which would skew the distances a lot.

Some other dilemmas that I'm having are:

1. Whether to leave the flat rocker section that I added to the board, or file it off.
2. Whether to chop off any of the nose or tail, and if so how much of each. It seems like chopping off some of the tail of the board might be an alternate way to give it a flatter rocker. The original Angulo Surfa had quite a bit of kick in the last foot or so of the thinned out pintail.   

[outcast]

I know the Angulo
Looks like we formed similar bastard projects

I would leave the flat
That's a big board, and I would therefore put the box forward....probably centered right where you  began the step

my understanding is that you will want your rear foot right over the mast, and is this for sup/sail or both

I think like mine, it'll end up being heavier than you might wish....I would prob leave the nose and tail alone

[PonoBill]

Sounds like fun. Yes, leave the flat alone, The flatter the board, the easier it is to add a foil.

I'd definitely chop the tail and put a big bevel in it. Popping up with a lot of tail behind the mast is a bitch. You can't change the AOA with a little body movement--the tail resists it, even if it's pinned.

I'm not sure about the position. Little Fugly has the tuttle about a foot from the end of the board, a few inches forward of the bevel. I'd measure it, but it's in the truck and I'm lazy.

Don't use mast tracks like I did with my first go, use the 10" Chinook fin boxes. They are stronger and the entry slot is in the middle instead of at the end. That means the plate can't wind up popping the front or back screws out because the foil slipped a little. Also gives you an extra half-inch of adjustment.

Yes, it will be heavy. Yes, you won't use it for long and you'll want something better. But yes, it will get you up and learning.

[surfinib]

MAC Kites has put out some decent guidelines on box placement here:
http://www.mackiteboarding.com/2018-ride-engine-foil-track-box/?gclid=CjwKEAjwue3nBRCCyrqY0c7bw2wSJACSlmGZXlEWfesNJD26veLokV-VGiGebDPu28UN1ER10zim4xoCgFnw_wcB
Please note that the measurement is to the center of the box.