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Old 04-07-2011, 03:02 PM   #1
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Country: Guernsey
Occupation: Postie
Interests: Heavy Heavy Metal
Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
Engines: Evinrude 115HO, Yam 90
Cruising area: Channel Islands

Join Date: Aug 2009
Posts: 1,460
Ring 21, 250xs, what gear ratio should I go for?

I'm looking at going for one of the new 250 Sport XS mercs for my 21C, running a combined setback bracket and lifter totalling about 17". They come with a choice of 1.62 or 1.75 sportmaster gearboxes, what would be best? What kind of pitch prop would I be starting with as a baseline?

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Old 04-07-2011, 03:25 PM   #2
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Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France

Join Date: Jan 2005
Location: Devon
Posts: 3,095
Suggest you pop down to next French race before wasting too much money !!
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National Outboard Immersed Propeller Mono Record 103mph
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Old 04-07-2011, 03:38 PM   #3
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Country: Guernsey
Occupation: Postie
Interests: Heavy Heavy Metal
Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
Engines: Evinrude 115HO, Yam 90
Cruising area: Channel Islands

Join Date: Aug 2009
Posts: 1,460
How come?
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Old 04-07-2011, 03:42 PM   #4
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Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France

Join Date: Jan 2005
Location: Devon
Posts: 3,095
The Big, Clumsey, Torquey, engines on little boats seem very difficult to balance !!
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National Outboard Immersed Propeller Mono Record 103mph
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Old 04-07-2011, 03:50 PM   #5
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Country: Guernsey
Occupation: Postie
Interests: Heavy Heavy Metal
Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
Engines: Evinrude 115HO, Yam 90
Cruising area: Channel Islands

Join Date: Aug 2009
Posts: 1,460
Yeah but they're French

I know what you're saying, buy mines quite far from a stripped out race boat, it's fully upholstered and will spend a lot more time 'cruising' 4 or 5 up than racing with 2... In fact if it voids the warranty I won't be racing with it at all
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Old 04-07-2011, 04:14 PM   #6
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Country: France
Location: Paris
Occupation: Computer Sales
Boat name: Le Cat
Boat make: Argo Cat 18
Engines: Mercury 2.4EFI
Cruising area: Paris

Join Date: Mar 2004
Location: Paris
Posts: 753
Then go with the 1.75
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Old 04-07-2011, 04:31 PM   #7
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Country: Guernsey
Occupation: Postie
Interests: Heavy Heavy Metal
Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
Engines: Evinrude 115HO, Yam 90
Cruising area: Channel Islands

Join Date: Aug 2009
Posts: 1,460
Thought so, cheers. The boat had a 225 Opti on before I bought it and was very well balanced, the same motor is now on my mate's very light P21 and is a bit of a handful by all accounts
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