aha ! I found the source of that drawing !

I had it for a year or so before I started to construct it, & it's been
6 months since it's done.

here are my notes:

I just visited your site.

your skeg looks extremely thick. does it just looks that way, or is it really
thick ?

is it made of 4mm plywood ? or is it made of something thicker ?

if it really is thicker than 4mm, than is there a special reason for it
being so ?

I would assume one would want the skeg to be as thin as possible, no...?

your shaft is made of bolt,nut & also some tubing to hold the bolt from squeezing the housing. I guess it's fine. I used something else for a shaft -
a little plywood disk with the diameter of the hole/hook. I positioned & glued it in place when I glued the whole housing. of course I sealed it before positioning it. it works fine too. it can't be removed. I figured there will
not be a reason to remove it since the skeg can be removed. I hope I am right.

I do have some remarks regarding the shape of the skeg:

I designed the form of the housing to reach the underside of the deck so it could be glued there to add strength. I am not sure if you installed it that way but it brings in a more important issue because if you did than you can design the wing large enough to go all the way to the top of that tall housing so you'll get more skeg surface without it being dipper in the water than your original design when extended. (I hope it's clear, I don't have an image to explain it).

with your skeg design, when it's extended there is no "wing surface" directly above the skegs tip, so you are loosing lateral resistance for no reason.

I am not sure how significant that extra surface is, perhaps you or somebody
else can tell us.

take it or leave it. 8-P

& thanks for the excellent drawing & ideas.

Erez

: That was/is my first drawing of the skeg I installed in my 17 and 19 foot
: Guillemots. The crosshatch area's depics different materials or voids in
: solids. Check the pics taken during construction to get a better idea of
: the actual constuction.

: Greg