Next message: Scott Templeton: "Re: T&T: Boarding Ramp Needed."
I have a pair of Lehman SP225s in my 35' semi-displacement boat that I
cruise at 1600 for about 8 knots and burn around 5 to 6 gals/hour. Way too
much power for this boat, but if need be, I can crank it up to 2400 and
14kts burning about 25 gals/hours - I do not do this on a regular basis.
However, I bring them up to 1800 or 2000 for a bit on occasion just to make
sure there are no overheating issues lurking just outside my normal cruise
speed.
Greg Steckel
M/V Different Drummer
President 35 Sundeck
Frog Mortar Creek, MD
www.chesapeakebayboater.com
www.fmyc.org
----- Original Message -----
From: "Faure, Marin" <>
To: "TrawlerList TrawlerList" <>
Sent: Tuesday, April 17, 2007 9:05 PM
Subject: T&T: Stress testing
> >run our engines at wide open throttle all the time....last time I did
> that my engines still worked fine, so it must be ok,
>
> Actually, you bring up a good point here, one that I see get people in
> trouble a fair amount and not just in boats. Many trawlers like Grand
> Banks have hull forms that can be driven faster than hull speed. Most
> people call them "semi-displacement" although I prefer the term
> "semi-planing" because I believe that's what they really are.
>
> When American Marine started the Grand Banks line back in the mid-1960s,
> their slogan was something like "dependable, economic cruisers." To
> this end they used engines that were ideal for this application. The
> most common powerplant for Grand Banks and the other makes that followed
> the same design philosophy was the Ford Lehman 120. One or two FL120s
> in a GB36 or GB42 would push the boats along at about 8 knots, give or
> take. For example, our 1973 fiberglass GB36 twin burns a combined total
> of about 5 gallons per hour at 1,600 rpm for a cruise speed of just over
> 8 knots.....
>
>>
> ______________________________
> C. Marin Faure
> GB36-403 "La Perouse"
> Bellingham, Washington
> _______________________________________________
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