Fuel Consumption

[unabated]

Actualy I am rather embarrassed to say “I am not
sure”.
The four or five trips I have made up to the 1000
Islands (about 80 – 90 miles) with this boat, I
figured I got about 1 to 1&1/4 Gallons/Hr – speed
around 6.5 to 7 knots RPM’s 2200.
Since Ive repitched the prob last summer, I have not
taken any long trips – just the 3 mile hike to the
outlet to sail.
I havent kept track of the usage.
At 2500 RPM’s the ass end of the boat really gets
buried and it takes two hands to steer but the 7.5
knots get’s me out the lake sooner. At 5$ a gallon
I’ll be more careful in the future.
I wished there was a better way to guess fuel
consumption. Motoring a couple of miles and then
heading back to the fuel dock on Sodus Bay is PITA.
Oh, and our fuel gauges work so well!
Maybe I’ll make a point to do a better job this summer
since I won’t be able to sail for awhile – Getting my
arm fixed.
How did you come up with those numbers?

alan

— Robert Fine <> wrote:

Really? I cruise at 1900-2000 rpm at 6 to 6.5
knots. I can get the engine
up to 2400 rpm, but by that point it’s trying to
climb out of the water.
At 1900 rpm it’s burning about 3/4 gallon per hour.
At 2200, it’s burning
nearly 2 gal/hr. Since the gain in speed of at most
a knot isn’t worth it,
I just cruise right along.

What are your experiences with speed/rpm/fuel
consumption?

Bob

On Thu, May 8, 2008 at 3:17 AM, alan P
<> wrote:

I repitched mine from a 13 to a 12. Mainly because

I

thought I should have more engine RPM’s before the
engine started to bellow black smoke. I have a W58

and

now can get it past 2800 rpms. Not that I ever run

it

that high, mostly cruise at 22 to 2400.
alan
— Syringa <> wrote:

Patrick

Hope you had a good trip back from Bellingham!

I

have been looking into the prop pull on Syringa

as

you know. (This is when the vessel is under

steady

steaming in forward at 1800 rpm or above)

(not

backing or docking) I don’t believe the shaft

is

off set (if it is it’s not much) and should not
account for that much pull. The prop may be

over

pitched. I will let you know if or when I come

up

with the answer.

I would like to hear from anyone who has changed
propellers or reduced the pitch.

Thanks
Don
Syringa

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[madsailor]

Hi Alan,

I came up with the numbers (which are very close to yours, by the way, at least before you re-pitched the prop) by filling the tank, running for 10 hours to get somewhere in no wind and then filling the tank again. Believe me, that's not what's going to happen this year as last year when I bought the boat my goal was to empty the three year old fuel as quickly as possible.

That's not the case this year…

Bob

On Thu, May 8, 2008 at 4:37 AM, alan P < ([email][/email])> wrote:

Actualy I am rather embarrassed to say “I am not
sure”.
The four or five trips I have made up to the 1000
Islands (about 80 – 90 miles) with this boat, I
figured I got about 1 to 1&1/4 Gallons/Hr – speed
around 6.5 to 7 knots RPM's 2200.
Since Ive repitched the prob last summer, I have not
taken any long trips – just the 3 mile hike to the
outlet to sail.
I havent kept track of the usage.
At 2500 RPM's the ass end of the boat really gets
buried and it takes two hands to steer but the 7.5
knots get's me out the lake sooner. At 5$ a gallon
I'll be more careful in the future.
I wished there was a better way to guess fuel
consumption. Motoring a couple of miles and then
heading back to the fuel dock on Sodus Bay is PITA.
Oh, and our fuel gauges work so well!
Maybe I'll make a point to do a better job this summer
since I won't be able to sail for awhile – Getting my
arm fixed.
How did you come up with those numbers?

alan

— Robert Fine < ([email][/email])> wrote:

Really? I cruise at 1900-2000 rpm at 6 to 6.5
knots. I can get the engine
up to 2400 rpm, but by that point it's trying to
climb out of the water.
At 1900 rpm it's burning about 3/4 gallon per hour.
At 2200, it's burning
nearly 2 gal/hr. Since the gain in speed of at most
a knot isn't worth it,
I just cruise right along.

What are your experiences with speed/rpm/fuel
consumption?

Bob

On Thu, May 8, 2008 at 3:17 AM, alan P
< ([email][/email])> wrote:

I repitched mine from a 13 to a 12. Mainly because

I

thought I should have more engine RPM's before the
engine started to bellow black smoke. I have a W58

and

now can get it past 2800 rpms. Not that I ever run

it

that high, mostly cruise at 22 to 2400.
alan
— Syringa < ([email][/email])> wrote:

Patrick

Hope you had a good trip back from Bellingham!

I

have been looking into the prop pull on Syringa

as

you know. (This is when the vessel is under

steady

steaming in forward at 1800 rpm or above)

(not

backing or docking) I don't believe the shaft

is

off set (if it is it's not much) and should not
account for that much pull. The prop may be

over

pitched. I will let you know if or when I come

up

with the answer.

I would like to hear from anyone who has changed
propellers or reduced the pitch.

Thanks
Don
Syringa

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()

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()

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____________________________________________________________________________________
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[unabated]

Thats the problem. Last year I topped off the tank
before putting it on the hard for the winter. Who
knows the speed and RPM’s done over the summer. Where
we sail, if there’s wind on the bay, we motor out for
5 minutes, sail for 6 hours and then motor back in for
5 minutes. I think I used 15 gallons the entire
summer.
Beckie had neck surgery so we didn’t go anywhere.
Not sure about this summer.
alan
— Robert Fine <> wrote:

Hi Alan,

I came up with the numbers (which are very close to
yours, by the way, at
least before you re-pitched the prop) by filling the
tank, running for 10
hours to get somewhere in no wind and then filling
the tank again. Believe
me, that’s not what’s going to happen this year as
last year when I bought
the boat my goal was to empty the three year old
fuel as quickly as
possible.

That’s not the case this year…

Bob

On Thu, May 8, 2008 at 4:37 AM, alan P
<> wrote:

Actualy I am rather embarrassed to say “I am not
sure”.
The four or five trips I have made up to the 1000
Islands (about 80 – 90 miles) with this boat, I
figured I got about 1 to 1&1/4 Gallons/Hr – speed
around 6.5 to 7 knots RPM’s 2200.
Since Ive repitched the prob last summer, I have

not

taken any long trips – just the 3 mile hike to the
outlet to sail.
I havent kept track of the usage.
At 2500 RPM’s the ass end of the boat really gets
buried and it takes two hands to steer but the 7.5
knots get’s me out the lake sooner. At 5$ a gallon
I’ll be more careful in the future.
I wished there was a better way to guess fuel
consumption. Motoring a couple of miles and then
heading back to the fuel dock on Sodus Bay is

PITA.

Oh, and our fuel gauges work so well!
Maybe I’ll make a point to do a better job this

summer

since I won’t be able to sail for awhile – Getting

my

arm fixed.
How did you come up with those numbers?

alan

— Robert Fine <> wrote:

Really? I cruise at 1900-2000 rpm at 6 to 6.5
knots. I can get the engine
up to 2400 rpm, but by that point it’s trying

to

climb out of the water.
At 1900 rpm it’s burning about 3/4 gallon per

hour.

At 2200, it’s burning
nearly 2 gal/hr. Since the gain in speed of at

most

a knot isn’t worth it,
I just cruise right along.

What are your experiences with speed/rpm/fuel
consumption?

Bob

On Thu, May 8, 2008 at 3:17 AM, alan P
<> wrote:

I repitched mine from a 13 to a 12. Mainly

because

I

thought I should have more engine RPM’s before

the

engine started to bellow black smoke. I have a

W58

and

now can get it past 2800 rpms. Not that I ever

run

it

that high, mostly cruise at 22 to 2400.
alan
— Syringa <> wrote:

Patrick

Hope you had a good trip back from

Bellingham!

I

have been looking into the prop pull on

Syringa

as

you know. (This is when the vessel is under

steady

steaming in forward at 1800 rpm or above)

(not

backing or docking) I don’t believe the

shaft

is

off set (if it is it’s not much) and should

not

account for that much pull. The prop may

be

over

pitched. I will let you know if or when I

come

up

with the answer.

I would like to hear from anyone who has

changed

propellers or reduced the pitch.

Thanks
Don
Syringa

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____________________________________________________________________________________

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[Anonymous]

Has anyone got fuel consumption rates for a 424 with a Yanmar 4JHE?

Tor

---

Silver Heels, P-424 #17
http://www.SilverHeels.us

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Quote:

---

Original Message

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<.. snip>

Post generated from Pearson424 Forum using Mail2Forum

[john stevenson]

RE: 4JHE fuel consumption.
Hopefully I get some metrics this summer on my 4JH4AE.
I had fairly good metrics on my old W60 thanks to some extended engine usage in the last 3 years. On long motor trips I usually kept the RPMs around 1800, which in calm conditions gave me close to 6 knots through the water. At that RPM level fuel consumption was about 0.75 gal/hr.

John

On Thu, May 8, 2008 at 8:16 AM, Silver Heels < ([email][/email])> wrote:

Has anyone got fuel consumption rates for a 424 with a Yanmar 4JHE?

Tor

---

Silver Heels, P-424 #17
http://www.SilverHeels.us

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[RichCarter]

Tor
I have a 4JH3-TE. The only difference between our engines is the turbo. I’ve heard threads from the group discussing fuel consumption. I’ve never been able to measure mine. I suppose that I could fill up before heading out for a long cruise, then fill-up when I get to where I’m going. Then compute fuel economy based on engine hours and fuel added. This assumes that I fill the tank to precisely the same level on both fillings. I don’t know how I could ever do this. It also assumes that I run at the same power setting for several hours. This is unlikely.

To answer your question, I would expect that any two contemporary engines would give very similar fuel consumption figures when driving a 424 in similar conditions. Variations include the effects of prop efficiency, condition of the bottom paint, wind and sea conditions. I’ve always estimated 1 gal/hr. I think this is pretty close, but I could burn more than 4gal/hr if I ran it wide-open. I would also guess that fuel consumption goes up rapidly at speeds greater than about 6.7kts. I’ve based this on how much power the engine seems to need in order to drive the boat. I usually cruise at about 7.0 kts. With the price of fuel going north of $5/gal, I might back off a little.

This is definitely not a good time to own a power boat. Lets see 30 gal/hr at $5/gal = $150/hr. I don’t think so. Our dinghy even uses 3gal/hr. We put more fuel in the dinghy than the sailboat in a year.

—
Rich Carter

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[Anonymous]

Thanks for your input, Rich. I expect we’ll find we’re burning about 1 gallon/hour at 6.5 knots in calm/moderate seas. Most boats/engines of this size/type come in around there. I was just curious whether anyone had hard numbers. No big deal. It is what it is.

In any case, we’re all likely to be a little slower to fire up the “iron jenny” in light airs now, with fuel prices so high. Maybe that’s a good thing.

Tor

---

Silver Heels, P-424 #17
http://www.SilverHeels.us

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[Anonymous]

Hello all:
CHARISMA, while in the ICW last month, burned between 5/8 & 3/4 GPH @ 1600 to 1800 RPM. Her speed in flat H20 was about 7.8>8 MPH. She has her original W-6, and I think her wheel is 15″x15″.
BILL
~~~ ~ (_~~ (_~ ~ ~ fair winds ~ ~ (_
Capt Bill Tice, aboard s/v CHARISMA, Deltaville, VA

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Post generated from Pearson424 Forum using Mail2Forum

[Anonymous]

In a message dated 5/8/2008 12:43:00 PM Eastern Daylight Time, writes:

I think her wheel is 15″x15″.

sorry, wrong boat!
BILL

~~~ ~ (_~~ (_~ ~ ~ fair winds ~ ~ (_
Capt Bill Tice, aboard s/v CHARISMA

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