Thanks for all the helpful input. As some suggested, the problem is almost certainly a clogged exhaust elbow. Several years ago (7 or 8?) the same thing happened but as we were motoring slowly up to our mooring. The yard fixed it by replacing the exhaust elbow. So it is clearly time to do that again. Thanks especially to Francois Rivard, who supplied a detailed description of the problem and its solution. BTW, some asked what engine it is. It’s a Perkins Perama M30, installed by the PO, probably around 1985. Showing its age in terms of surface rust, but still running fine. Eric Frank Cat's Paw C&C 35 Mk II Mattapoisett, MA
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