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30 May 2010, 10:16
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#1
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Member
Country: UK - England
Town: Bournemouth
Boat name: Seadrive
Make: Capelli Tempest 470
Length: 4m +
Engine: Suzuki DF70
MMSI: 235079113
Join Date: Jul 2008
Posts: 162
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What speed do you start to plane at?
I know its dependent on size, weight and power - but just curious about what sorts of speeds seem to be the norm.
I'm just getting on the plane at about 15 kts (I think it was kts it was set to when I tested  ) and 3000 rpm.
Thats on a 4.7m rub with Suzuki 70.
It would be so much nice to be able to plane at harbour speed limits (10kts)
John
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30 May 2010, 10:59
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#2
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RIBnet supporter
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,237
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My 5.8m Destroyer with a Johnson 115 used to plane at about 13/14 knots. Ask me again in October 
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A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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30 May 2010, 12:05
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#3
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RIBnet admin team
Country: UK - England
Town: Swindon
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 239050687/235055163
Join Date: Jul 2005
Posts: 8,881
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I find I can start to plane at about 12 knots depending on weight distribution.
However, I find to stay on the plane without getting knocked off it in anything other than flat calm I need to hold 19 knots.
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30 May 2010, 17:40
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#4
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 3,979
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I'm with Nos, except for the 12 kts thing. Mines more like 15 to 19 depending on load and distribution. Alone it's probably lower, but I don't usually watch speed when taking off.
FWIW, rpm at plane (for me, anyway) is kind of moot: I usually nail the throttle forward until the stern lifts, then back off to the speed I want.
jky
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30 May 2010, 18:52
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#5
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RIBnet admin team
Country: UK - England
Town: Swindon
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 239050687/235055163
Join Date: Jul 2005
Posts: 8,881
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Quote:
Originally Posted by jyasaki
I'm with Nos, except for the 12 kts thing. Mines more like 15 to 19 depending on load and distribution. Alone it's probably lower, but I don't usually watch speed when taking off.
FWIW, rpm at plane (for me, anyway) is kind of moot: I usually nail the throttle forward until the stern lifts, then back off to the speed I want.
jky
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I only know because if I do 10 knots (the speed limit) in Poole Harbour it'll slip onto the plane if I lean forward too far.
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30 May 2010, 19:02
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#6
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RIBnet supporter
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,237
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Quote:
Originally Posted by jyasaki
FWIW, rpm at plane (for me, anyway) is kind of moot: I usually nail the throttle forward until the stern lifts, then back off to the speed I want.
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+1 
My Destroyer was very hard to hold just on the plane anyway - it either wanted to drop back to displacement, or would take off up to about 18kt.
__________________
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
Sent from my Computer, using a keyboard and mouse
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30 May 2010, 20:20
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#7
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Trade member
Country: UK - England
Town: South Coast
Boat name: Sea Safari 1
Make: Parker Baltic
Length: 9m +
Engine: Enough
Join Date: Apr 2008
Posts: 1,102
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We used Poole alot with our previous RIB and put smart tabs on so that she would plane at 10kts. They worked very well, the problem being that as we were planing, everyone thought we were breaking the limit!
Steve
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06 June 2010, 20:50
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#8
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Member
Country: UK - England
Boat name: The mystery machine
Make: zodiac pro 550 open
Length: 5m +
Engine: 90hp johnston
MMSI: 235074837
Join Date: Feb 2010
Posts: 24
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Quote:
Originally Posted by longjohn
I know its dependent on size, weight and power - but just curious about what sorts of speeds seem to be the norm.
I'm just getting on the plane at about 15 kts (I think it was kts it was set to when I tested ) and 3000 rpm.
Thats on a 4.7m rub with Suzuki 70.
It would be so much nice to be able to plane at harbour speed limits (10kts)
John |
I have a 5.5m zodiac with a 90HP and thats on the plane at about 13knots.
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06 June 2010, 22:28
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#9
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Member
Country: UK - England
Town: Gloucestershire
Boat name: Pigs Ear
Make: Osprey Vipermax
Length: 7m +
Engine: Honda 225
MMSI: 235090881
Join Date: Dec 2006
Posts: 3,132
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Tabs up 11 knots
Tabs down 8 knots
__________________
---------------------------------------------------
Chris Stevens
Born fiddler
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07 June 2010, 07:55
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#10
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RIBnet supporter
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,293
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13 or thereabouts
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