scarf joint

I am building a 14 foot rowing dorie.  I have three vertical ribs 1 1/4 inch wide at which I plan to back all scarf joints.  My attempts at cutting the joints on scrap plywood has demonstrated that a long joint (10 degree) is much more variable than a 45 degree joint using a bevel attachment on my planer.  My question is if I go with the the 45 degree with screws on both sides of the joint, will this be as good a joint as the 10 degree and a single line of screws through the joint.

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RE: scarf joint

Scarf joints are far stronger than needed for most small boats. If you are backing the joint with frames, and sheathing the outside with fiberglass, just use a butt joint.

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