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14 August 2013, 23:01
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#81
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RIBnet supporter
Country: UK - England
Town: Dinard, Brittany
Boat name: Into the Red
Make: Osprey Vipermax
Length: 7m +
Engine: Evinrude E-tec 250HO
MMSI: 235 076 114
Join Date: Apr 2009
Posts: 1,957
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Quote:
Originally Posted by Poly
Are you sure the gauge is set up in knots?
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I was told by the owner that it was set to knots and as far as I was aware this could not be changed. I have just looked at the manual however and it appears you can swap between MPH,KMH and knots. It would make more sense if that 50 number is in mph rather than knots, as that gives 43 knots which makes sense with what DHD's number are. Bearing in mind three up. I did glance at the kph readout on the GPS a couple of times and I definitely saw 80 flick up a couple of times and that is also 43 knots.
Shame!
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14 August 2013, 23:26
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#82
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Member
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
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Quote:
Originally Posted by gotchiguy
Killcord positioning is OK, he did seem a little surprised when we turned up in lifejackets and then I proceeded to put the kill cord on..
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Let's hope the owner finds it next time out. Kitting out on a budget is always hard as you have to sacrifice things you later wish you hadn't but such is life. At the end of the day if the owner is happy that's all that counts.
The max rpm on an opti 150 is 5,750
www.BoatsandOutboards4Sale.co.uk
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14 August 2013, 23:47
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#83
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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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Max recommended RPM is 5250-5750 
Tried a few props onmine & can't get it over 5200rpm.
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15 August 2013, 08:10
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#84
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RIBnet supporter
Country: UK - England
Town: Dinard, Brittany
Boat name: Into the Red
Make: Osprey Vipermax
Length: 7m +
Engine: Evinrude E-tec 250HO
MMSI: 235 076 114
Join Date: Apr 2009
Posts: 1,957
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Quote:
Originally Posted by Downhilldai
Max recommended RPM is 5250-5750
Tried a few props onmine & can't get it over 5200rpm. |
Hmm. Well with you being on 21" a 19" should be about right. I will try and get him a 17" to borrow from somewhere, just to see if it brings the revs up. It really doesn't sound right during the transition phase, lugging away. Perhaps it's just the shoddy opti technology 
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15 August 2013, 08:18
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#85
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Member
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,304
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Quote:
Originally Posted by Poly
Are you sure the gauge is set up in knots?
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I'd put Money on it! 
__________________
A clever Man learns by his mistakes..
A Wise Man learns by other people's!
The Road to HELL ..is Paved with "Good inventions!"
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15 August 2013, 12:01
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#86
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Member
Country: Cyprus
Town: Limassol
Boat name: THUNDERSTORM
Make: SELFBUILT
Length: 6m +
Engine: MERCURY 200
Join Date: Mar 2009
Posts: 42
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Speed should be in mph.
Theoritical speed (knots) = rpm x propeller pitch x 60 x 0.0254 / gear ratio / 1852 meaning that your theoritical speed is 43.47 knots or 80.5 kmh or 50 mph.
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15 August 2013, 18:06
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#87
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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 gotchiguy
Hmm. Well with you being on 21" a 19" should be about right. I will try and get him a 17" to borrow from somewhere, just to see if it brings the revs up. It really doesn't sound right during the transition phase, lugging away. Perhaps it's just the shoddy opti technology |
No lugging with mine - revs cleanly from idle but won't go past 5200ish rpm.
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15 August 2013, 18:15
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#88
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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: 8,872
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Quote:
Originally Posted by Downhilldai
No lugging with mine - revs cleanly from idle but won't go past 5200ish rpm.
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Also, you're getting 46knts+ which is top bollox for a 5.8.
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15 August 2013, 18:35
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#89
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Member
Country: Cyprus
Town: Limassol
Boat name: THUNDERSTORM
Make: SELFBUILT
Length: 6m +
Engine: MERCURY 200
Join Date: Mar 2009
Posts: 42
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Quote:
Originally Posted by Mollers
Also, you're getting 46knts+ which is top bollox for a 5.8. |
Why???
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15 August 2013, 18:54
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#90
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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: 8,872
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Quote:
Originally Posted by Kostas74
Why???
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'Coz the foofoo valve blows if you go any faster.
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15 August 2013, 19:01
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#91
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Member
Country: Cyprus
Town: Limassol
Boat name: THUNDERSTORM
Make: SELFBUILT
Length: 6m +
Engine: MERCURY 200
Join Date: Mar 2009
Posts: 42
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Quote:
Originally Posted by Mollers
'Coz the foofoo valve blows if you go any faster.
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It chinewalks?
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15 August 2013, 19:18
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#92
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,622
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Quote:
Originally Posted by Maximus
I'd put Money on it! |
I'll put money on it that it wasn't doing 50 knots with a 19" prop at 5200 rpm.*
* if you are in any doubt it is physically impossible!
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15 August 2013, 19:31
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#93
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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 Poly
I'll put money on it that it wasn't doing 50 knots with a 19" prop at 5200 rpm.*
* if you are in any doubt it is physically impossible!
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Spoilsport 
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15 August 2013, 20:03
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#94
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Member
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,304
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Quote:
Originally Posted by Poly
I'll put money on it that it wasn't doing 50 knots with a 19" prop at 5200 rpm.*
* if you are in any doubt it is physically impossible!
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You don't Reckon 
__________________
A clever Man learns by his mistakes..
A Wise Man learns by other people's!
The Road to HELL ..is Paved with "Good inventions!"
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15 August 2013, 21:29
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#95
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RIBnet supporter
Country: UK - England
Town: Rutland
Length: no boat
Join Date: May 2006
Posts: 2,500
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So a 150 on a 6.2 is the sweet spot
We know the 7 with a 250 ho can't blow a 6.5 with a 200 opti complete with a fat man Hanging on the wheel
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16 August 2013, 09:45
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#96
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Member
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,252
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My old viper 5.75 with 150 opti maxed at46 knots
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Member of the Ribeye supporters club!!!
Member of Bombard 380 Aerotec club
Member of SR4 club
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16 August 2013, 18:15
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#97
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Member
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866
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Max speed I had with my 6.2 was 42kn. She's a bit of a heavyweight now I've added all the bells and whistles like seats and iron work and the top speed these days is more like 36/38kn WOT 
__________________
Andy
Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
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17 August 2013, 01:19
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#98
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Member
Country: UK - England
Town: Margate / Ramsgate
Boat name: Bumbl
Make: Scorpion
Length: 8m +
Engine: Yanmar diesel
Join Date: Feb 2002
Posts: 2,837
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"Back in the day" 6m vipermax / 150 opti 45 knts. Cracking boat, many many fond memories and member of a very elite club to which my volvo v70r is the only other member that springs to mind.
That's the "must have another one some day" club.
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17 August 2013, 09:10
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#99
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RIBnet supporter
Country: UK - England
Town: Dinard, Brittany
Boat name: Into the Red
Make: Osprey Vipermax
Length: 7m +
Engine: Evinrude E-tec 250HO
MMSI: 235 076 114
Join Date: Apr 2009
Posts: 1,957
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Just to make it clear to Matt H and others - this boat was NOT rigged by Osprey!
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19 August 2013, 17:30
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#100
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Member
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,726
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Quote:
Originally Posted by gotchiguy
In response to the steering position criticism, the aim was to have the same position as Bogmonster's console which he designed to be usable both seated and standing.
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I had two requirements, one was to leave instrument space (which the high position doesn't) and the other was to be able to sit down behind the wheel, which as somebody who has a few pies hidden in my Fladen suit, would not have been very comfortable with the lower position
Mine is just right for me, it's about half way between the two "standard" positions.
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A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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Into the Red
Ro Row
