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That’s the best we have come up with so far. On way to Nantucket. Noticed issue underway:
W60 runs great. 150 degrees, 70 psi oil. No smoke, white or otherwise. Valves just adjusted, injectors re jetted, heat exchanger cleaned, fuel pumps rebuilt. 2000 rpm usually gets me 7.0 in still water. Has for the past 4000 miles Now it’s 6.
Paragon with vee drive. Clean, full oil, tranny fluid. No weird noises. Clean running gear, bottom. Not dragging a lobster trap. Not too heavily laden. Gps and apparent speed are the same, so it ain’t an adverse current. And not wind either.
I got nothing. Who can show their smarts?
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Bottom fouled?
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Adam,
Do you have feather prop, e.g., Maxprop, and was the pitched changed on you
last haulout?Regards,
John Stevenson
http://www.svsarah.comOn Fri, Aug 19, 2011 at 11:17 PM, Joseph Steiner wrote:
Quote:Bottom fouled?Post generated from Pearson424 Forum using Mail2Forum
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Before I went totally nuts with the tach, I’d suspect the knot meter. They
are notoriously finicky, and agreement with the GPS is temporary at best.
Also, have you jumped overboard and actually looked at the hull or prop?
This year seems to be the year of barnacles and it only takes a few on the
prop to really screw up the efficiency. They have been growing
significantly in as little as two or three weeks, even with fresh paint.Bob
On Sat, Aug 20, 2011 at 6:44 AM, Adam Silverstein wrote:
Clean bottom, fixed 20″ prop. But have not verified tach. Engine really
sounds right for rpms, but given the fact that I have an unknown variable
where mostly simple mechanical configurations are involved, I’ll need to
check. (and thank you for responses).
Adam Silverstein
s/v Phantom Corsair_______________________________________________
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Bob Fine
s/v Pelican
Pearson 424 Hull #8
http://thesailinglife.blogspot.com
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Adam
If it were your transmission, the engine would likely behave as if you had a bad clutch. The engine would race like it was slipping. You don’t report that behavior however. You might check the transmission fluid to be sure. It shouldn’t smell burned and should be at the proper fill level. If it were the V-drive, you’d hear it.Is your engine still running to 2000RPM?
I assume that you have a fixed-blade prop. My guess is a problem with your prop, possibly a line wrapped or growth on the prop. Barnacles can cause the problem you’ve observed. You’ve ruled this out however. Are you sure there’s nothing on your prop? Did you dive on it?
A dirty bottom can make your boat act sluggish. Its amazing what a difference a clean bottom can have. You’d need quite a lot of growth for the behavior noted below.
Rich
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