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Typical gph for a 6 hp Mercury 4-stroke ?

 
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probably_spam

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Since: Nov 14, 2003
Posts: 24



(Msg. 1) Posted: Tue Dec 23, 2003 8:17 pm
Post subject: Typical gph for a 6 hp Mercury 4-stroke ?
Archived from groups: rec>boats (more info?)

We just replaced the ancient o/b with a 6 hp, 4-stroke Mercury. What are
some typical per hour fuel consumption numbers for a 6 hp 4-stroke Merc
o/b ?

I'm asking because we're about to make the crossing out to Santa
Catalina Island the day after christmas and I want to make sure I carry
enough fuel in case the winds should completely die down. I'm _guessing_
1/2 a gallon per hour at 3/4 throttle ?

Thanks,



-Sven

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fishwisher

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Since: Dec 21, 2003
Posts: 3



(Msg. 2) Posted: Tue Dec 23, 2003 10:36 pm
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

For starters, how big a boat are you pushing??

--
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"Sven" wrote in message

 > We just replaced the ancient o/b with a 6 hp, 4-stroke Mercury. What are
 > some typical per hour fuel consumption numbers for a 6 hp 4-stroke Merc
 > o/b ?
 >
 > I'm asking because we're about to make the crossing out to Santa
 > Catalina Island the day after christmas and I want to make sure I carry
 > enough fuel in case the winds should completely die down. I'm _guessing_
 > 1/2 a gallon per hour at 3/4 throttle ?
 >
 > Thanks,
 >
 >
 >
 > -Sven

 >> Stay informed about: Typical gph for a 6 hp Mercury 4-stroke ? 
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probably_spam

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Since: Nov 14, 2003
Posts: 24



(Msg. 3) Posted: Tue Dec 23, 2003 10:59 pm
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

In article ,
"FishWisher" <FishWisher.DeleteThis@comcast.net> wrote:

 > For starters, how big a boat are you pushing??

Doesn't matter (within error bars).

Just running at 3/4 throttle, regardless of hull shape or size, Mercury
6 hp, 4-stroke.

Thanks,



-Sven
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Eric H1

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Since: Dec 31, 2003
Posts: 28



(Msg. 4) Posted: Wed Dec 24, 2003 1:09 am
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

I'm an inland boater, but seems you are talking about a pretty small motor
for the Pacific. I'd want more than that on any lake in down-state Illinois.
Maybe I don't understand your application, but you are looking at a very
small power source. Not much help against the whims of Big Momma Nature.
Just my $0.02 worth.
 >> Stay informed about: Typical gph for a 6 hp Mercury 4-stroke ? 
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probably_spam

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Since: Nov 14, 2003
Posts: 24



(Msg. 5) Posted: Wed Dec 24, 2003 1:09 am
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

In article , "Eric H"
wrote:

 > I'm an inland boater, but seems you are talking about a pretty small motor
 > for the Pacific. I'd want more than that on any lake in down-state Illinois.
 > Maybe I don't understand your application, but you are looking at a very
 > small power source. Not much help against the whims of Big Momma Nature.
 > Just my $0.02 worth.

I'm just looking for typical hourly fuel consumption of a 4-stroke, 6
hp, Mercury outboard running at 3/4 full throttle.

Thanks,



-Sven
 >> Stay informed about: Typical gph for a 6 hp Mercury 4-stroke ? 
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WaIIy

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Since: Oct 29, 2003
Posts: 455



(Msg. 6) Posted: Wed Dec 24, 2003 8:22 am
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

On Tue, 23 Dec 2003 21:59:42 -0800, Sven
wrote:



 >
  >> For starters, how big a boat are you pushing??
 >
 >Doesn't matter (within error bars).
 >
 >Just running at 3/4 throttle, regardless of hull shape or size, Mercury
 >6 hp, 4-stroke.
 >

Actually, it does matter.

What's the big secret here, Sven?
 >> Stay informed about: Typical gph for a 6 hp Mercury 4-stroke ? 
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probably_spam

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Since: Nov 14, 2003
Posts: 24



(Msg. 7) Posted: Wed Dec 24, 2003 10:18 am
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

In article ,
WaIIy <eIvez.RemoveThis@ChangeThisPart.com> wrote:

 > On Tue, 23 Dec 2003 21:59:42 -0800, Sven

 >


  > >
   > >> For starters, how big a boat are you pushing??
  > >
  > >Doesn't matter (within error bars).
  > >
  > >Just running at 3/4 throttle, regardless of hull shape or size, Mercury
  > >6 hp, 4-stroke.
  > >
 >
 > Actually, it does matter.
 >
 > What's the big secret here, Sven?

While it is true that a harder-to-push boat would probably result in
lower rpm and thus lower gph fuel consumption at a fixed throttle
setting, that is within the error bars.

Just running at 3/4 throttle, regardless of hull shape or size, Mercury
6 hp, 4-stroke.

Thanks,




-Sven
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DownTime

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Since: Jan 07, 2004
Posts: 31



(Msg. 8) Posted: Wed Dec 24, 2003 3:40 pm
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Sven,

it depends. good luck NOT becoming a statistic.

"Sven" wrote in message



 >
  > > For starters, how big a boat are you pushing??
 >
 > Doesn't matter (within error bars).
 >
 > Just running at 3/4 throttle, regardless of hull shape or size, Mercury
 > 6 hp, 4-stroke.
 >
 > Thanks,
 >
 >
 >
 > -Sven
 >
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jchaplain1

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Since: Dec 31, 2003
Posts: 47



(Msg. 9) Posted: Wed Dec 24, 2003 5:35 pm
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Good luck not becoming a statistic? Why the hell would you say that?
Just have nothing else to say? I guess you think Sven must be such a
foolhardy mariner for not putting a more powerfull outboat on his
SAILBOAT.....duh.
John C.

On Wed, 24 Dec 2003 14:40:48 GMT, "DownTime"
wrote:

 >Sven,
 >
 >it depends. good luck NOT becoming a statistic.
 >




  >>
   >> > For starters, how big a boat are you pushing??
  >>
  >> Doesn't matter (within error bars).
  >>
  >> Just running at 3/4 throttle, regardless of hull shape or size, Mercury
  >> 6 hp, 4-stroke.
  >>
  >> Thanks,
  >>
  >>
  >>
  >> -Sven
  >>
 >
 >> Stay informed about: Typical gph for a 6 hp Mercury 4-stroke ? 
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DownTime

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Since: Jan 07, 2004
Posts: 31



(Msg. 10) Posted: Wed Dec 24, 2003 6:45 pm
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"jchaplain" wrote in message

 > Good luck not becoming a statistic? Why the hell would you say that?
 > Just have nothing else to say? I guess you think Sven must be such a
 > foolhardy mariner for not putting a more powerfull outboat on his
 > SAILBOAT.....duh.
 > John C.
 >

please go back and read the original post, and the first few response. I was
adding a bit of sarcasm, but this person asked a very open, somewhat boating
illiterate question and when others came to try and help by asking him for
more detailed information, the guy just blew them off. if it was not for his
two responses, I would not have said anything. twice he responded and never
answered the original question. other people were trying to help, and if he
choose to be so ignorant in his response, I would pretty much guarantee he
is the type who has a pretty high probability of becoming a statistic.

I may not have been clear, but I was thinking of a statistic in terms of
getting towed home because the captain in this case failed to adequately
plan his trip. I think he might be foolhardy to expect anyone else to know
his fuel consumption based solely on the engine. it has nothing to do with a
more powerful engine, just simple physics. is it a 20 fter or a 60 fter, it
would have a HUGE impact on the calculation of fuel consumption.
 >> Stay informed about: Typical gph for a 6 hp Mercury 4-stroke ? 
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K Smith

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Since: Jan 01, 2004
Posts: 90



(Msg. 11) Posted: Wed Dec 24, 2003 10:21 pm
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Sven wrote:

 > wrote:
 >
 >
  >>I'm an inland boater, but seems you are talking about a pretty small motor
  >>for the Pacific. I'd want more than that on any lake in down-state Illinois.
  >>Maybe I don't understand your application, but you are looking at a very
  >>small power source. Not much help against the whims of Big Momma Nature.
  >>Just my $0.02 worth.
 >
 >
 > I'm just looking for typical hourly fuel consumption of a 4-stroke, 6
 > hp, Mercury outboard running at 3/4 full throttle.
 >
 > Thanks,
 >
 >
 >
 > -Sven


  Good rule of thumb for 4 stroke petrol is 1 ltr/hr = 3 HP (or 0.27 US
gals/hr = 3 hp).

  The tricky thing is to know how much HP the prop is actually consuming
at 3/4 throttle because HP consumed is NOT linear on a fixed pitch prop.
i.e. the prop will consume more than 3/4 power at 3/4 throttle opening
because the prop will allow it to rev higher than 3/4 max rpm.

  1/2 a US gal/hr should get you a fair bit of the available 6 HP so your
guesstimate is probably realistic in the premises.

  It might be just as easy to take a short test run on a full tank,
refill after a known time & see what fuel was used, then repeat at WOT
(only for a short time!!! you can multiply the results) to see how much
the engine is capable of using in a worst case scenario & even then
allow a good margin because in offshore water you will definitely use
more even on a calm day:-)

K
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noah

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Since: Jan 30, 2004
Posts: 56



(Msg. 12) Posted: Thu Dec 25, 2003 6:59 pm
Post subject: Re: Typical gph for a 6 hp Mercury 4-stroke ? [Login to view extended thread Info.]
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On Tue, 23 Dec 2003 22:44:01 -0800, Sven
wrote:


 >wrote:
 >
  >> I'm an inland boater, but seems you are talking about a pretty small motor
  >> for the Pacific. I'd want more than that on any lake in down-state Illinois.
  >> Maybe I don't understand your application, but you are looking at a very
  >> small power source. Not much help against the whims of Big Momma Nature.
  >> Just my $0.02 worth.
 >
 >I'm just looking for typical hourly fuel consumption of a 4-stroke, 6
 >hp, Mercury outboard running at 3/4 full throttle.
 >
 >Thanks,
 >
 >
 >
 >-Sven

Is that you, Harry? "uni.berlin", "fu.berlin", it's all so confusing. Surprised)
<a rel="nofollow" style='text-decoration: none;' href="http://www.mercurymarine.com/mercury_6_fourstroke3" target="_blank">http://www.mercurymarine.com/mercury_6_fourstroke3</a>
Regards,
noah

To email me, remove the "OT-" from OT-wrecked.boats.noah.
....as you were. Surprised)
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