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15 August 2010, 09:23
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#1
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Merc 75 Offset?
Putting a Merc 75 on a 14ft Dateline Bikini speedy boaty thingy today. Any suggestions on amount of stbd offset?  I'm thinking 30-35mm.
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15 August 2010, 09:52
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#2
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Member
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
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I just ran this question by a couple of experts, 1st said heads, the other said tails
If it's a new boat with no holes in the transom I'd be tempted to put it in the centre. If it does happen to pull to one side you could always ballast it more on the other side with the batteries etc.
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15 August 2010, 09:58
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#3
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by martini
I just ran this question by a couple of experts, 1st said heads, the other said tails
If it's a new boat with no holes in the transom I'd be tempted to put it in the centre. If it does happen to pull to one side you could always ballast it more on the other side with the batteries etc. |
New boat?!! I think Dateline went bust in about '87! 
Although, he's just had a very fancy s/s transom plate made which covers all existing holes inside and out, so we are effectively, 'as new'. So go central you reckon Matt? 
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15 August 2010, 10:04
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#4
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Member
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
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If you look in any O/B manufacturers installation manual I doubt you'll find anything about offsetting so it can't be that far out.
In a perfect world you'd be able to get behind the new plate and sneak a peek at the original holes, or any other imprint etc on the transom that might give away where the old motor was
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15 August 2010, 10:05
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#5
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by Mollers
New boat?!! I think Dateline went bust in about '87! |
Hang on a mo.! I've just googled Dateline Marine. They make model boats and possibly still race hulls. Sorry Matt. 
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15 August 2010, 10:08
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#6
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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75hp would prob be ok fitted central, but a bit of offset would help counter any prop torgue. An inch would be plenty
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15 August 2010, 10:18
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#7
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by Downhilldai
75hp would prob be ok fitted central, but a bit of offset would help counter any prop torgue. An inch would be plenty |
Cheers. 
Hey 'Rainman', What's the status of Dateline Marine these days? 
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15 August 2010, 10:20
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#8
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by martini
In a perfect world you'd be able to get behind the new plate and sneak a peek at the original holes, or any other imprint etc on the transom that might give away where the old motor was |
Derr, didn't think of that.
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15 August 2010, 10:44
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#9
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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Quote:
Originally Posted by Mollers
Cheers.
Hey 'Rainman', What's the status of Dateline Marine these days? |
Don't know - they're nothing to do with Soozook or Avon......
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15 August 2010, 12:02
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#10
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by Mollers
Derr, didn't think of that. |
Existing holes are central.
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20 August 2010, 11:35
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#11
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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How did you get on?
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20 August 2010, 22:49
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#12
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by Downhilldai
How did you get on?
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Sort of finished last night. Had to fiddle with height etc. It's gone on centally and looks tiny compared to that nail of a Jonny V4. Lee will do the rest.
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28 August 2010, 21:51
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#13
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Just returned from maiden run, excellent. The Dateline and the Merc 75 work well.
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29 August 2010, 11:19
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#14
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Member
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
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Doesn't drive round in circles then?
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29 August 2010, 12:54
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#15
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by martini
Doesn't drive round in circles then?
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Yeah. Fortunately, there's a circuit of pubs on the Fal.
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29 August 2010, 12:57
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#16
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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Quote:
Originally Posted by Mollers
Just returned from maiden run, excellent. The Dateline and the Merc 75 work well. |
Good news - thought they'd be ok together. I take it Lee's as happy man then?
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29 August 2010, 14:05
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#17
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by Downhilldai
Good news - thought they'd be ok together. I take it Lee's as happy man then?
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Showing 45mph now,39/40 with the V4 heapster, faster pull-out,improved balance,far less row and better economy. An allround gain.
Very much like binning an Opti and replacing it with an Etec. 
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29 August 2010, 14:49
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#18
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Member
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
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If I replaced an Opti with an Etec I'd be the one going round in circles, at least while the Etec gets turned off and on again
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29 August 2010, 15:45
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#19
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,875
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Quote:
Originally Posted by martini
If I replaced an Opti with an Etec I'd be the one going round in circles, at least while the Etec gets turned off and on again
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Turns out that my Etec stopped, 'coz your Optis had nicked all of the fresh air in the area and replaced it with partially burnt DFI smog. There we were blaming the gulls for the stink. 
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30 August 2010, 21:05
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#20
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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Quote:
Originally Posted by Mollers
Showing 45mph now,39/40 with the V4 heapster, faster pull-out,improved balance,far less row and better economy. An allround gain. |
Sounds like he got lucky with the supplied prop too
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