Thanks to all.

Does anyone have comments on....cutting slots in the bulkhead and
tabbing... from hull... through slot... onto hull again ?

What is "peel ply" ?

By "tape" I'm assuming you mean cloth, to be imbedded.

Source of "structural foam" ?

How might "panel support" [bulkheads ?] be best implemented ?

Most appreciatively,

Courtney




Jim Conlin wrote:

A couple of alternative suggestions:
Save the effort of sanding the fillet by laying he glass at the same time.
For a perpendicular bulkhead, the circumference of a 1" radius fillet is over
1-1/2", and 3" tape gives very little bearing on the hull or the bulkhead.
For such a fillet i'd suggest at least 6" tabbing glass. 6X the radius.
Miultiple layers should be slightly staggered or varying in width so they
taper out onto the panel. If the original tabbing failed, it didn't spread
far enough on the panel. Go further.
Woven tape will have half of its fibers running along the joint, contributing
nothing to its strength. I recommend 45-45 knitted glass. It has the added
joy of being more conformable to curved joints. For the final layer or small
work, bias-cut glass cloth is OK.
If the final finish matters, cover the last glass with peel ply and squeegee
it smooth. For curved joints, multiple pieces will be needed. THink of a
mason's step flashing.

"Wayne.B" wrote:


On Mon, 07 Jun 2004 17:35:46 -0500, Courtney Thomas
wrote:

Advice and descriptions appreciated.
Courtney

============================================

I don't claim any special expertise but have done a few. First thing
of course, is to remove all of the old tabbing. I used sharp
woodworking chisels and a disk sander. Ideally you should insert a
thin layer of structural foam between the bulkhead and the hull if the
builder left a sufficient gap for that purpose (it eliminates a "hard
spot" on the hull which can lead to stress concentration). Next build
up a rounded fillet using expoxy thickened with microbaloons or
fairing compound. The idea is to create a curved surface with about a
1 inch radius which joins the hull and the bulkhead. Small, round
beverage bottles are frequently used to get the desired shape. Allow
fillet to cure and lightly sand. Next step is to apply unthickened
epoxy to the fillet and adjoining surfaces, followed by an application
of 3 inch glass tape, another coat of epoxy, and a second layer of
tape. Apply additional tape if needed for increaded strength.
Repeat all the above on other side of the bulkhead.

Broken tabbing is usually caused by hull panel flex going through
heavy seas, and can indicate that the original designer/builder did
not give enough thought to structural support. Consider adding more
panel support if feasible.




--
s/v Mutiny
Rhodes Bounty II
lying Oriental, NC
WDB5619