Join Date: Jun 2014
Location: Coast of Maine
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Re: Standard diesel for Bristol 29.9?
I may be late to the conversation, but for what it's worth: We're on our second season with a 1979 B 29.9 and we are thoroughly happy with the boat. We sail in Casco Bay in Maine. 'Velella' has the original Yanmar 2QM15, that you mentioned. This seems to be a good size for the boat. We easily motor at 5 knots, at about 2000 rpms.
But I don't think that 20hp would be too much in this boat. Based on that, and in light of the fact that Bristol later included a 20hp model, 10hp might feel 'light', especially if you will be sailing in areas with strong tides or currents.
I suggest test-steaming the boat under power to make sure that you will be comfortable poking along for hours in nasty conditions.