GL: Hyper Miling

[Luther]

Dan,



When you are trying to actually get somewhere, surely you have an estimate of your normal speed along with your course and the distance you have plotted out. Knowing these items, you can estimate your fuel requirements per hour or per mile based on previous experience.

Now let's say you estimate a thirty mile trip at 30 mph, this would be one hour. However you get stuck behind a long tow or at several bridges and sit at idle. Your gpm has been blown! On the other hand if one was to relate to gph, ones estimate would be more sound.

FWIW, I find gph safer with all things being considered. And I never equat to miles while on the water. With mpg, way too many varibles will come in to play. Remember Murphy was a sailor....


Luther

knots vs miles, maybe the reason... gph vs mpg



--- On Thu, 6/26/08, Dan & Peggy <dpbow at frontiernet.net> wrote:

> From: Dan & Peggy <dpbow at frontiernet.net>
> Subject: Re: GL: Hyper Miling
> To: "Great Loop List" <great-loop at lists.samurai.com>
> Date: Thursday, June 26, 2008, 9:35 AM
> 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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