fuel economy
Does fuel economy always lean towards narrower (less livable) hulls?
Do narrower hulls lean towards less weight carrying capacity?
Is there compromise?
Are all liveaboard cats not already a huge nod towards fuel economy
over a mono that is capable of getting beyond displacement speed?
If one is spending a ball park of 500k and up, how much of a factor
is the fuel economy a cat delivers a factor of the final bill?
Leaving aside ethics of fuel consumption, does the owner of a 2
million dollar custom cat or ,say, a krogen 58, lie awake at night
worrying about his fuel bill?
Jonah.
Hi Jonah
You asked -
If one is spending a ball park of 500k and up, how much of a factor
is the fuel economy a cat delivers a factor of the final bill?
Leaving aside ethics of fuel consumption, does the owner of a 2
million dollar custom cat or ,say, a krogen 58, lie awake at night
worrying about his fuel bill?
Jonah.
I suspect that these are the wrong questions.
Fuel prices will continue to rise; the unknown factors are by how much and
over what period.
The cost and availability of fuel may not affect the first owner in 2008 but
it WILL affect your resale price in, say, 2012.
It is widely agreed that the real cost of boating is the difference between
what you paid and what you get back.
Try asking-
How will big, thirsty engines affect the saleability and price of my boat
when I come to sell?
Regards
Roger Bingham
France
I don't think these are the wrong questions Roger.
The real cost of boating is the pleasure and use you get from your
chosen boat.
More efficient cats tend to have narrower hulls (so less space) and
are less able to take load.
This may or my not be an issue for a buyer.
4 years of compromised space may be worth paying for.
As an aside, as I understand it, (and there is every chance I may be
wrong!) larger hp engines don't use more power until you push up the
throttle.
(ie) does a 480hp engine not use the same as a 260hp engine when
both are set to trawl at 100 hp?
At the end of the day, if you get spanked for an extra 100k 4 years
down the road, but you had a great ride and you can take the hit, I'd
choose that over 4 years of being cramped.
Time is precious.
regards
Jonah.
On Jan 9, 2008, at 10:28 AM, Roger Bingham wrote:
Hi Jonah
I suspect that these are the wrong questions.
Fuel prices will continue to rise; the unknown factors are by how
much and
over what period.
The cost and availability of fuel may not affect the first owner in
2008 but
it WILL affect your resale price in, say, 2012.
It is widely agreed that the real cost of boating is the difference
between
what you paid and what you get back.
Try asking-
How will big, thirsty engines affect the saleability and price of
my boat
when I come to sell?
Regards
Roger Bingham
France
Power-Catamaran Mailing List
Dear Jonah,
Basically, with a diesel engine you will burn approx 200gm of fuel per
kw/hour. So the actual HP rating of the motor is rlatively immaterial. It is
as you say:- 100hp generated will require the same amount of fuel regardless
of the engines rating.
Of course it is not quite that simple and the amount of fuel required to
generate one horsepower, or kilowatt, will vary slightly depending on
whereabouts on the fuel curve the power is being generated. But generally
these differences are pretty small, like 20 grams[ roughly a postage stamp
weight of fuel] if you are comparing similar types of engine.
regards,
Malcolm Tennant.
MALCOLM TENNANT MULTIHULL DESIGN LTD
PO Box 60513, Titirangi.
Waitakere 0642
NEW ZEALAND
Ph: +64 9 817 1988
e-mail: malcolm@tennantdesign.co.nz
www.tennantdesign.co.nz
www.catdesigners.com
-----Original Message-----
From: Malcolm Tennant
Basically, with a diesel engine you will burn approx 200gm of fuel per
kw/hour.
Malcolm
To help those of us that are metrically challenged, what does that equate to
in liters or gallons per kW/hr.
Most fuelling stations sell diesel fuel by volume not weight.
Thanks in advance. <smile>
Arild,
It is 0.238l or 238ml. The system used is immaterial. What is important is
that a 400hp engine will use roughtly the same amount of fuel to produce one
HP/KW for one hour as a 50hp engine.
As a designer I use the metric system because it is much easier and systematic
than Imperial and I use grams instead of litres because I am constantly
concerned with mass [weight/displacement]. Designers generally tend to have
slightly different concerns to the everyday user.
I hope this helps.
Regards,
Malcolm Tennant.
MALCOLM TENNANT MULTIHULL DESIGN LTD
PO Box 60513, Titirangi.
Waitakere 0642
NEW ZEALAND
Ph: +64 9 817 1988
e-mail: malcolm@tennantdesign.co.nz
www.tennantdesign.co.nz
www.catdesigners.com
In U.S. terms, I believe it takes a half-pint of fuel to produce one
HP/KW for one hour. Or 0.06 U.S. gallons. Regardless of the total
power produced.
--Georgs
It is 0.238l or 238ml. The system used is immaterial. What is important is
that a 400hp engine will use roughtly the same amount of fuel to produce one
HP/KW for one hour as a 50hp engine.
As a designer I use the metric system because it is much easier and systematic
than Imperial and I use grams instead of litres because I am constantly
concerned with mass [weight/displacement]. Designers generally tend to have
slightly different concerns to the everyday user.
I hope this helps.
Regards,
Malcolm Tennant.
MALCOLM TENNANT MULTIHULL DESIGN LTD
PO Box 60513, Titirangi.
Waitakere 0642
NEW ZEALAND
Ph: +64 9 817 1988
e-mail: malcolm@tennantdesign.co.nz
www.tennantdesign.co.nz
www.catdesigners.com
Power-Catamaran Mailing List