great-loop@lists.trawlering.com
Cruising America's Great Loop and other inland routes
View all threadsHyper Miling
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.
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@yahoo.com wrote:
From: M S valhalla360@yahoo.com
Subject: GL: Hyper Miling
To: great-loop@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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Well said Mr Barnes,
I find that cruising at 6.5 to 8 knots is very comfortable and to estimate fuel consumption I have always referred to gph. Travelling at the speed of say 6 knots and be hit with a 2 knot counter-current, I have just taken a 33% impact in mpg. However when estimates are based on the gph I have a warmer feeling for fuel requirements.
Luther
--- On Thu, 6/26/08, Tom Barnes tomb215@yahoo.com wrote:
From: Tom Barnes tomb215@yahoo.com
Subject: Re: GL: Hyper Miling
To: great-loop@lists.samurai.com, valhalla360@yahoo.com
Date: Thursday, June 26, 2008, 8:28 AM
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@yahoo.com
wrote:
From: M S valhalla360@yahoo.com
Subject: GL: Hyper Miling
To: great-loop@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.
http://lists.samurai.com/mailman/listinfo/great-loop
To modify your Great-Loop subscription options (change
email address,
unsubscribe, etc.) go to:
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Doesn't mpg matter if you are actually trying to get somewhere?
Dan B.
----- Original Message -----
From: Tom Barnes
To: great-loop@lists.samurai.com ; valhalla360@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@yahoo.com wrote:
From: M S valhalla360@yahoo.com
Subject: GL: Hyper Miling
To: great-loop@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.
http://lists.samurai.com/mailman/listinfo/great-loop
To modify your Great-Loop subscription options (change email address,
unsubscribe, etc.) go to:
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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@frontiernet.net wrote:
From: Dan & Peggy dpbow@frontiernet.net
Subject: Re: GL: Hyper Miling
To: "Great Loop List" great-loop@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@lists.samurai.com ; valhalla360@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@yahoo.com
wrote:
From: M S valhalla360@yahoo.com
Subject: GL: Hyper Miling
To: great-loop@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.
http://lists.samurai.com/mailman/listinfo/great-loop
To modify your Great-Loop subscription options (change
email address,
unsubscribe, etc.) go to:
http://lists.samurai.com/mailman/options/great-loop
http://lists.samurai.com/mailman/listinfo/great-loop
To modify your Great-Loop subscription options (change
email address,
unsubscribe, etc.) go to:
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http://lists.samurai.com/mailman/listinfo/great-loop
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unsubscribe, etc.) go to:
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Babyboomer: I don't know if I should take that as a compliment or insult. We
are a generation or so behind them (working as we go. lost track of the trust
fund along with the new Krogen).
Sounds like you are using gph, but mentally keeping track of mpg, which
achieves the same result.
Mike & Tamy
Valhalla II