"Brian Whatcott" wrote...

Graduating to my first multi-sheet stitch-n-glue... butt joints with
blocks
are ugly, scarfing will throw off my sheet layout. Can I use a plain butt
joint, supported on both sides by glass and epoxy?

Reassure yourself with a test strip say 3 X 12 inches bonded on the
narrow side to another similar piece. Tape both sides.
Then bend to failure.

Did it fail at the joint?
The method is no good.
It failed in the plain ply? Good!

It probably depends also on how the joint will be stressed. If it's in an
area where bending stresses are minimal, it may work just fine. However, if
it is subject to repeated bending loads, it may eventually fail. Also, if
the joint is marginal to begin with, quality control is critical -- make
sure your production pieces are AT LEAST as good as your test pieces.

A compromise may be to use several layers of tape at the joint,
appropriately beveled, to spread the load further. The final layer of cloth
over the hull will add to the strength.