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12 June 2011, 13:32
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#41
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by boilermaker1
Tornado 4.5, 42mph flay calm Yamaha 60hp 2 stroke..With 60hp 4 stroke 36mph
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Interesting-how much weight difference is there between the motors you used?
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12 June 2011, 13:35
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#42
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Member
Country: UK - England
Town: Salisbury
Boat name: TORA
Make: Tornado
Length: 4m +
Engine: Yamaha 60hp
Join Date: Jan 2009
Posts: 148
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What Prop
Quote:
Originally Posted by boilermaker1
Tornado 4.5, 42mph flay calm Yamaha 60hp 2 stroke..With 60hp 4 stroke 36mph
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What size prop on the 60hp 2 stroke for 42 mph?
Cheers
Paul
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12 June 2011, 15:39
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#43
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Member
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,411
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Quote:
Originally Posted by Leapy
Wow! 48mph with only 70hp. Impressive  |
Yeah just a bit, i get 36mph out of my mariner 75 running a 21"prop on my 6m.
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"Life may often suck, but the alternative is unacceptable"
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12 June 2011, 18:27
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#44
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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Quote:
Originally Posted by Festinghouse
Yeah just a bit, i get 36mph out of my mariner 75 running a 21"prop on my 6m.
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Thats good for that size of engine ? most peeps would have double that HP on that size of hull
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12 June 2011, 18:46
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#45
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Member
Country: Sweden
Town: Stockholm
Make: KR7
Length: 7m +
Engine: Evinrude 150 H.O
Join Date: Aug 2005
Posts: 735
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First boat with stepped hull and powerlift.... More to come 
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12 June 2011, 21:28
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#46
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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Quote:
Originally Posted by joakimhansson
First boat with stepped hull and powerlift.... More to come
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Is it just me ? .. but the name on your plotter might be connected with your massive speed 
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12 June 2011, 22:33
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#47
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Member
Country: Sweden
Town: Stockholm
Make: KR7
Length: 7m +
Engine: Evinrude 150 H.O
Join Date: Aug 2005
Posts: 735
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Quote:
Originally Posted by Bigmuz7
Is it just me ? .. but the name on your plotter might be connected with your massive speed |
Had to check what you meant Swedish language is fantastic sometimes...
Better now...
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13 June 2011, 00:06
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#48
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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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Boat weight (Wet) 1350. Viper 22" Evinrude Etec 250HO, 5850 revs, two way average with me on board alone, light load with only ~60litres fuel: 52knts exactly. With both of us and a weeks worth of camping kit it struggles over 48. Heck, just having GD on board drops at least 2 knots!
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13 June 2011, 02:44
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#49
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Member
Country: USA
Boat name: 470 Hurricane
Make: Zodiac
Length: 5m +
Engine: Outboard 70hp
Join Date: May 2011
Posts: 1
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470 Hurricane. 70hp Evinrude. Fairly flat. 35kts.
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13 June 2011, 23:02
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#50
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Member
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,411
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Quote:
Originally Posted by Bigmuz7
Thats good for that size of engine ? most peeps would have double that HP on that size of hull
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I bought the boat with a 115 johnson v4 on the back which was tired and needed work doing, I already had the 75 on a stand so i put that on. i swapped from the 19"prop to the 21" meaning acceleration isnt the best but is good for covering distance and also keeps top end revs down a little.
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MMSI Sticker
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21 June 2011, 16:10
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#51
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Member
Country: UK - England
Town: Ipswich
Boat name: Jammy Dodger
Make: Avon Adventure 7.20
Length: 7m +
Engine: 200 Yamaha
Join Date: Dec 2008
Posts: 365
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Quote:
Originally Posted by Jonny H
What sort of prop and size are you running and what engine revs are you getting at WOT
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Standard prop
6000RPM
Will
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21 June 2011, 20:12
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#52
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Member
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 549
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Valiant DR750, Merc 150, 19inch pitch, all 13 stone of me on board and 2 litres of fuel - 15 knots MAX.......
Still have major issues!
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21 June 2011, 21:52
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#53
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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Quote:
Originally Posted by Courageous
Valiant DR750, Merc 150, 19inch pitch, all 13 stone of me on board and 2 litres of fuel - 15 knots MAX.......
Still have major issues!
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did you remember to untie the rope from the quay side 
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21 June 2011, 22:02
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#54
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Member
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 549
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No it didn't come with a quayside. The prop model number says LH on the end - tried to google it but no luck so far...... 
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21 June 2011, 22:14
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#55
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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Quote:
Originally Posted by Courageous
No it didn't come with a quayside. The prop model number says LH on the end - tried to google it but no luck so far...... |
Dats yer problem then .. try leaving from de other side next time .. and seeing as water always goes down the plughole clockwise in de norn' hemisphere .. keep makin roit turns on de way out  ye'll be doin 50 before ye know it
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22 June 2011, 10:08
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#56
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Member
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
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I once managed 312 Knts on the GPS through Largs marina!
It would appear all those masts confused the Garmin for a couple of miliseconds and it momentarily put me half a mile up the hill according to the track log. I guess in the time it got confused and corrected itself the mile round trip would have needed to be at 312 Knots! 
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22 June 2011, 19:51
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#57
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Member
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,411
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Is your engine new or second hand? could your engine have a left hand prop fitted instead of a rigt hand, then been rigged to run the engine in reverse so as to make the boat go forward. outboards tend not to run at full speed in reverse!
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"Life may often suck, but the alternative is unacceptable"
MMSI Sticker
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16 July 2011, 17:43
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#58
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Member
Country: Canada
Town: Montreal
Make: Zodiac Open Pro 650
Length: 6m +
Engine: Mercury 225
Join Date: May 2011
Posts: 24
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I've done 42knots...that was the limit of my personal comfort...we could have done more...normally cruise around 25knots (bugs hurt at 42kn)
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17 July 2011, 11:36
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#59
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Member
Country: UK - England
Town: Cornwall
Length: no boat
Join Date: Oct 2004
Posts: 1,518
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5.85 Ribtec with 150 Opti, light fuel load & 23" prop touched 44 kts BUT chine walked at anything over 32 ish knots, so much so I'd resigned myself to never exploring the engines potential 
However now on a 21" prop and with a full fuel load and extra anchor & chain in bow locker she's now much more stable, able to cruise at 30 kts and no chine walking up to about 40 kts, briefly saw 46 kts at 5200 rpm
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17 July 2011, 12:49
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#60
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,650
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Ribcraft 4.8m, Tohatsu 2-stroke 60hp, tweaked to 70hp, standard 15" aluminium propeller, 50 litres of fuel, two people on board, 36mph at 5,800 revs. A larger pitch stainless-steel propeller would make a difference.
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White Noise
Northwind Challenger
Into the Red
Ro Row
Sula
