GL: Hyper Miling

[Dan & Peggy]

Doesn't mpg matter if you are actually trying to get somewhere?

Dan B.

  ----- Original Message -----
  From: Tom Barnes
  To: great-loop at lists.samurai.com ; valhalla360 at yahoo.com
  Sent: Thursday, June 26, 2008 7:28 AM
  Subject: Re: GL: Hyper Miling


  You know, until all the "Baby Boomers" started flooding the cruising
  scene, fuel consumption was always figured by the number of gallons
  used over a period of time at a given RPM. No one ever tried to figure
  how many miles you got to a gallon. It's not like driving your car down
  the road. To many other rhings can effect it.

  Tom B.

  --- On Thu, 6/26/08, M S <valhalla360 at yahoo.com> wrote:

  From: M S <valhalla360 at yahoo.com>
  Subject: GL: Hyper Miling
  To: great-loop at lists.samurai.com
  Date: Thursday, June 26, 2008, 7:34 AM

  You guys with your big high powered speed boats. 9 knots!!

  Nice graph. The lines don't neccessarily cross at the same point, so there
  isn't neccessarily anything wrong. A smaller slower boat will have the
  lines
  cross at lower counter current speeds. It will also have a more dramatic
  improvement with a following current.

  It does demonstrates the value of slower speed with no current or a
following
  current. With a 3 knot following current, you get almost 4 times the milage
  going 6 knots as opposed to 9.

  With a counter current, it gets more complicated. I assume 9 knots is full
  thortle and normal cruise speeds would be in the 6-7 knot range. If we are
  hyper miling at say 4 knots (assuming 8 mpg), I eyeballed where the lines
  would cross and at a little over 2 knots of current, 6 knots thru the water
  becomes more efficent.

  Another point, on the graph, when you get to a 5 knot counter current, the
  fuel eficency isn't much different from 6 to 9 knots. The actual speed over
  ground is ranging from 1 to 4 knots. If it is 4PM and I am 10 mile from
home,
  at six knots I get in around 2AM. Crank up the throttle for little or no
  difference in fuel efficency, I get in around 6:30pm.

  Of course, if I could afford a nice new 48' Krogen, I probably wouldn't
  care
  about an extra $10,000 a year in fuel.
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