I was thinking if the inside panels were pre-glassed with 4oz would 4oz over the fillets be sufficient given a "sufficient" fillet with 6oz on the outside. I'm trying to get a sense of when a fillet joint with glass goes to being a butt joint with glass and whether 9oz tape is overkill if the interior panels are going to be glassed anyway. Oh heck I'm just confusing myself,,basicially I'm trying to imagine the most efficient use of 4oz and 6oz cloth without relying on tape.

On a friends bigger rowboat that was s&g with 3/8" ply the exterior glass cracked at the bow/bottom panel where the interior was very rigid. Same with a Mill Creek panel on the outside bilge chine where the knee on the inside concentrated the bending.

: My point is, the filet is the point of greatest stress, therefore the
: reinforcement of the joint should probably match or exceed that of the
: rest of the panel. Another thing that effects this is the size of the
: fillet. A larger fillet will require less reinforcement. But adding glass
: instead of more schmutz would probably be stronger for a given weight.

: There is no point in making the panel stronger than the joint. Adding
: reinforcement to the panel and not the joint seems backwards. This will
: only assure that if something does fail, it will be the joint, not the
: panel. Ideally, the joint and panel should be engineered to fail
: simultaneously.

: I don't have any formula for when you eliminate the glass. The joint is only
: strong enough until it breaks. I'm sure you can get away without glassing
: the joint. It will be great until you exceed its strength.