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posted to rec.boats.cruising,rec.boats
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First recorded activity by BoatBanter: Nov 2006
Posts: 19,111
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Paradise Found, aka, The Marina at Marigot Bay, Passarelles, etc.
On Mar 29, 8:06*pm, Wayne.B wrote:
On Mon, 29 Mar 2010 14:24:25 -0700 (PDT), Tim
wrote:
On Mar 29, 2:07 pm, Wayne.B wrote:
On Mon, 29 Mar 2010 09:47:44 -0700 (PDT), Tim
wrote:
Reply:
I read somewhere that the QE2 gets 6" per gallon.- Hide quoted text -
- Show quoted text -
Which probably translates out to be about a gallon per piston stroke.
Maybe more!
Fairly easy to figure out: At 20 knots they are doing approximately
6000 x 12 = 72,000 inches/hour. If they are burning 1,000 gallons per
hour which I believe is in the ballpark, that would be 7.2 inch/gal
which jibes pretty closely with the 6 in/gal stated previously.
What we don't know is what RPM the engines are turning at, the number
of pistons, and whether they are 2 cycle or 4 cycle - all of which
would impact fuel per power stroke. Just for grins, let's estimate
720 RPM, 10 pistons and a 2 stroke engine. That's 12 RPS x 10
powerstrokes per rev = 120 PowerStrokes/sec. Fuel burn at 1,000 gph
is less that 1/3 gal/sec so the amount of fuel per power stroke is
actually not all that high, maybe about 1/4 ounce per stroke.
Wayne, I found some specs. Scroll down to the FAQ's.
It's pretty interesting.
9- 9cyl. 4- stroke engines at 400 RPM running on Baker's fuel. No
wonder it's rated in tons.
http://www.qe2.org.uk/engine.html
Interesting, thanks.
Note that by using a diesel-electric propulsion system, they have
cleverly eliminated the need for alternators and generators... *
:-)
Thank Goodness!!!!
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