Mercury outboard owners

Hi
I have a 75hp 4 stroke mercury outboard on my 5.4m Trailcraft Trailblazer.
At 5000rpm i am gettin about 26.5 knots in glassy conditions.
Does that seem right? I thought i would get better, around 30/32 knots?
What do other mercury owners think? is that about right?
Any info and advise would be greatly appreciated.
Thanks

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Tim's picture

Posts: 2486

Date Joined: 26/09/06

Good

Sat, 2008-04-12 11:47

That speed looks about right Rodrat. I had a 5.5m Ally with 115 evinrude on the back and it only did about 32knots so the 75 seems to be pushing it along ok.  

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big john's picture

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Date Joined: 20/07/06

Ponies

Sat, 2008-04-12 11:54

75hp isn't that much ponies so I think you should be reasonably happy with those figures Rodrat.

John

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Leave the cities behind, out of sight of mind,
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Andy's picture

Posts: 522

Date Joined: 08/10/05

Yer i agree 75hp is probably

Sat, 2008-04-12 12:01

Yer i agree 75hp is probably a little underpowered. A guy in town has the same boat with a 115hp optimax, next time i see him ill ask what his his does. Is 5000rpm WOT if so I would say it is overproped. from memory that engine should rev to 6000.
andy
From Innisfail Far Nth Queensland

Rodrat's picture

Posts: 1672

Date Joined: 13/01/07

Thanks

Sat, 2008-04-12 12:11

Cheers for the feedback guys,
I thought it may be a prop problem.
For conditions in rockingham i think it will be sweet.
Up north when it is glassy a bit more grunt would be nice but i only go up north once or twice a year so for around the metro area it should be fine.


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brenz's picture

Posts: 2182

Date Joined: 15/06/06

is it having trouble jumping

Sat, 2008-04-12 15:07

is it having trouble jumping up onto the plain???
take it to your dealer if you are concerned and go for a water test with variouse props they shouldnt have a prob with doin it .
or if you want real power get a yamaha hahahaha
brenz

Rodrat's picture

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Date Joined: 13/01/07

Brenz

Sat, 2008-04-12 15:09

No prob with gettin up on the plain, just havent had a boat before and wasnt sure on the power i should be gettin.


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Rodrat's picture

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Date Joined: 13/01/07

Test

Sat, 2008-04-12 15:10

Heading out tomorrow so i will give it a few tests around 5000 to 6000rpm.


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Tim's picture

Posts: 2486

Date Joined: 26/09/06

WOT

Sat, 2008-04-12 15:19

Mercury site says WOT between 4500 and 5500 so its right in the middle at 5000. Looks like the mecury 4stroke doesnt rev as high as some others.

Just make sure not to over rev it Rodrat.

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brenz's picture

Posts: 2182

Date Joined: 15/06/06

5000 for a 4 stroke is very

Sat, 2008-04-12 15:27

5000 for a 4 stroke is very good it will never get 6000 like a 2 stroke unless you have a minature prop. if it hits the plain quik then you are good as id just enjoy 28 knots atleast you wont break the welds
brenz