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Old 08 September 2001, 18:28   #1
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Country: UK - N Ireland
Town: Bangor
Make: Shakespeare
Length: 7m +
Engine: O/b 225
Join Date: Jan 2001
Posts: 188
115 Mercury props

I am about to fit a 115 Merc 2-stroke onto a 5.5 Humber. The engine was previously fitted on a much bigger, heavier rib, and came with a laser prop which I think might be too small. Any suggestions what prop pitch I should use?
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Old 08 September 2001, 18:44   #2
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Country: Sweden
Town: Karlstad
Make: Viking
Length: 5.4
Engine: Mercury 90
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Hi Alan,

I have a Mercury 90 fitted on my Viking 540. Recently I bought a Laser II prop and it is much better than the standard-fitted Black Max. The Laser II is 13 1/4 x 20 inch (diameter x pitch) and is just about perfect for my boat.

What are the dimensions of the Laser prop?

Giving that your engine is more powerful and assuming that your Humber weighs more-less the same as my Viking, you'll probably need a 22" or 24" pitch.

Hope this helps!

Sasa
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Old 09 September 2001, 03:31   #3
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Country: UK - N Ireland
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Length: 7m +
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Thanks for the help, My laser 2 is also 20 inch pitch. I will give it a try but it almost certainly too small unless the gear ratio is different between the 90 and the 115. I will have to contact Steel Developments Ltd. to get it re-pitched.
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Old 10 September 2001, 01:33   #4
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Country: Greece
Town: ATHENS
Boat name: SUN KISS II
Make: Nuova Bat 9 Falcon -
Length: 5m +
Engine: Outboard Mercury 115
Join Date: Jun 2001
Posts: 639
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Merc 115 props

I remind to you all that there is a thread some days ago for an Al prop exchange.

Michael
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