I have a C&C 30 which had a Martec folding prop when I bought it. I don't recall the size but I think it was 11 or 12 X 6 or 7. The performance was so bad I replaced it with a 11X7 fixed 2 blade which is much better. Better in forward and reverse and stays in balance. I would guess that your Martec is definitely oversized.
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