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Old 26 September 2010, 13:37   #1
Member
 
Country: UK - Wales
Town: Swansea
Boat name: Big Blue
Make: Osprey Vipermax 6.2
Length: 6m +
Engine: Mercury 100 Efi
Join Date: Apr 2010
Posts: 8
Osprey Vipermax 6.2 100 HP Mercury Efi

I thought some of you may be interested in my new build RIB - an Osprey Vipermax 6.2m with a 100 HP Mercury Efi 4 stroke engine...

After looking at many second hand RIBS for 12k to 15k I decided that I would be better off building a new RIB if I could find a realistically priced engine, second hand trailer and a good build quality hull - preferably built in the UK.

I brought the new 100 Efi from Mobile Marine - very good service and knowlegable. The engine has the standard 3 blade Aluminium prop - 19" pitch.

I looket at several UK built RIB's and settled on a Osprey Vipermax. Roy was very helpfull and let me configure it for my needs / wants. (The cruising area is the Bristol Channel so a good deep V was required).

I purchased the hull in the following configuration...
Twin console
2 Individual side by side seats with wing backs set as far aft as practical.
220l Built in fuel tank
Blue parallel tubes

The RIB has masses of space forward of the console.

I just finished the main part of the build and have been sea trailing the RIB today...
Planing revs = 3000 to 3100 RPM. 15Kn. 3800 RPM gives 20Kn. WOT 5600 RPM gives 38Kn.

I am very happy with this!

When the engine has run in more I may see the top RPM of 6000. (WOT initially gave 5400 RPM). A change of prop to s/s 4 blade may give me more speed / acceleration but I must admit that this engine / hull size does all that I want it to...

Fuel economy...too early to say but so far 8 hrs. on approx. 1/4 tank - I will have to do a brim to brim one day.

Overall I am very happy with the outcome.

Only slight problem has been with instrumentation - the Garmin 100i radio is a dissapointment - speaker inaudiable at modist background noise levels and the display is fogging up. I will be on the phone tomorrow.
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Old 26 September 2010, 13:43   #2
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
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Old 26 September 2010, 14:28   #3
Member
 
Country: UK - Wales
Town: Swansea
Boat name: Big Blue
Make: Osprey Vipermax 6.2
Length: 6m +
Engine: Mercury 100 Efi
Join Date: Apr 2010
Posts: 8
???

I thought this was a usefull post without pictures! Just goes to show....so see a couple of pics of the RIB part completed...
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Old 26 September 2010, 14:38   #4
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Nice!
Good performance too, for a 100hp motor.
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Old 26 September 2010, 15:02   #5
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Country: UK - Wales
Town: Swansea
Boat name: Big Blue
Make: Osprey Vipermax 6.2
Length: 6m +
Engine: Mercury 100 Efi
Join Date: Apr 2010
Posts: 8
Yes I was a little anxious!!! I will post more pics. when I have finished the fit out.
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Old 26 September 2010, 15:05   #6
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Who does the stainless fabs for you?
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Old 26 September 2010, 17:23   #7
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Country: UK - Wales
Town: Swansea
Boat name: Big Blue
Make: Osprey Vipermax 6.2
Length: 6m +
Engine: Mercury 100 Efi
Join Date: Apr 2010
Posts: 8
Osprey standard wing back seats...
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