possible aeration of the props, something
you’ll have to experiment with. The jack
plates are already installed, so you may
wish to experiment with the drive height.
The overall efficiency will be determined by
a number of factors, including the nature of
the inflow of water to the props. You’ll have
to do a fair amount of experimentation to
find the optimum combination of tilt and
height setting. The procedure you’ve proposed should work well. I’d use a GPS speed
reading when doing the testing and take
into account both wind and current effects.
40 Shades Of Oil
Q. I have a seven-year-old Westerbeke
35D3 diesel engine on my sailboat with
600 to 700 hours on it. I change the oil and
filter in the fall before lay-up, and run the
engine briefly. When I check the dipstick,
the oil is black. Oil out of the jug is yellow.
What causes this, and is it a problem? The
engine is running fine and the exhaust
looks normal. — Joe Kosheff
A. The blackening of the lube oil in the
crankcase of your engine is quite normal
and is primarily the result of the intrusion
of combustion gases that enter the crankcase due to the imperfect seal provided
by the piston rings and the cylinder walls,
plus other locations in the engine where a
totally gas-tight seal may not always exist.
Some engines will keep their oil clean for
up to 200 hours; others may blacken the
oil in a few hours of operation. Just be
sure that you change the oil at the proper
interval, when the engine is at full operating temperature.
Chuck’s Here To Answer
We’re grateful to Chuck for his extensive research in answering members’ technical questions. He tries to e-mail a response
for each question for this column via
com. We only present
a fraction of them here;
the rest are personal
responses to members,
which you can read
at “Ask The Experts,”
Read more articles
by Chuck at www.
Engineer, sailor, pilot,
and former president
Fishers, crabbers and oystermen have been part of the Chesapeake Bay since before recorded history. Today, they are an endangered species in the truest sense.
Sept. 18, 2010 – May 1, 2011
America’s National Maritime Museum
at U.S. #926859
100 Museum Drive, Newport News, VA 23606
/12/10 4:51 PM Page 1
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