If the through hull is 1.5 inches and the hull 0.5 inches thick Neal's
recommendation would give just a such a taper. I think you miss the
point though. In plugging a through hull the repair is not generally
intended to be structural -just a bond secure enough to stop the plug
falling out is all that is required. Finer tapers are of course needed
for full structural repairs where the stress on the laminate must be
transferred acorss the repair.

Cheers MC

DSK wrote:




The hole should be tapered in a radius of approximately
four times the radius of the hole itself.


Malarkey again.

The taper should be between 4:1 to 12:1 by thickness, the diameter of the
hole has nothing to do with it.