Thanks Bram,
Just a quick up date.
I did manage to get the parts apart but not before cutting the cassette.
Now I have some finishing to do.
All the points you make in you email I believe are true. In my case, the
tolerances are far too close to use Spartite unless you¹re willing to do to
some elaborate process using vacuum bags to draw the material in.
In my situation, I¹m actually considering just wrapping the rudder with
plastic film coating it with a mixture of resin and #5 filler. With the
cassette open now I should be able to slip it in and close the cassette on
it.
I am also considering how and/or if I will close the back of the
cassette. Perhaps I should consider using Chicago Screws which would allow
me to adjust the fit on the rudder. Any opinion on this option?
David Lindsey
> Dave and everyone,
>
> Sorry to hear about the problems and this is admittedly too late but may help
> others.
>
> A couple of things that should help in the Spartite process.
>
> First, you must check to make sure that your blades are tapered or dead
> straight up near the top. Use calipers to check the "fatness". If they are
> fatter down 12" from the top than they are down 6", you have some fairing to
> do before making the spartite gasket. Do not proceed until this is fixed
> (you'll never get the blade out of the cassette).
>
> Second, try to make the cassette with 1/8" of clearance all around the blade
> for the pour. This increases the thickness of the spartite which allows it to
> give more when inserting and retracting the blades. It also makes for a
> better pour/gasket because it eliminates air bubbles.
>
> Third, make the width of the pour approx 1" at both the top and the bottom of
> the blades (no more). This require two operations for each blade. I've made
> a extra dagger board trunk into which I insert the cassette blocks for the
> pour (instead of using the boat). I have holes in the sides (like the rudder
> cassette) to make the pour easy.
>
> Fourth, Use a liberal amount of the supplied Vaseline on the blades but be
> careful not to contaminate the surface on which you want the spartite to
> stick.
>
> The benefit of using this stuff is that you get a gasket that removes all slop
> in the blades. This becomes particularly important when you are sailing the
> boat flat at high speed downwind. Done correctly, you should get several
> years out of a set of gaskets.
>
> I hope everything works out OK Dave.
>
> Best regards,
>
> Bram
>
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