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27 August 2013, 06:22
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#1
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Member
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
Join Date: Aug 2003
Posts: 1,824
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rib racing, covered bow
Anyone from the old rib racing days, find much improvement in speed by covering the bow? Ive heard a few people mention it, but trying to figure out a way of proving it soon. My rub rail isnt big enough to hook anything onto, and any deck or covered bow id fit, would obviously add weight
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29 August 2013, 10:31
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#2
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Member
Country: UK - England
Town: London/Devon
Make: Linley Swan /Ribeye
Length: 6m +
Engine: Yamaha F150
Join Date: Mar 2011
Posts: 113
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The canvas tops used to add speed considerably. On 7m race RIB we gained about 6mph
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14 January 2014, 07:40
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#3
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Member
Country: UK - England
Town: Southampton
Boat name: Sarah Hope
Make: Scand
Length: 9m +
Engine: 2 X 5.7 EFI
Join Date: Aug 2006
Posts: 92
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Any more details Tom?
Would be interesting to know speed/power and what designed this was.
Quote:
Originally Posted by TomLinley
The canvas tops used to add speed considerably. On 7m race RIB we gained about 6mph
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14 January 2014, 08:15
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#4
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Member
Country: UK - England
Town: swanwick/hamble
Boat name: stormchaser
Make: custom rib
Length: 8m +
Engine: inboard/diesel
Join Date: Aug 2007
Posts: 3,848
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There were some French guys in a rib with a covered front when we went round Britain, it does make a difference, the wind come over the bow and creates a vortex.
There are two main ways of doing it, you can use an acrylic hood cloth or if you want it more permanent you can do a tech layup in GRP, obvious problems with mooring lines etc but worth doing if you want to be more competitive
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15 January 2014, 15:15
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#5
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Member
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
MMSI: TBC
Join Date: Dec 2006
Posts: 4,021
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Quote:
Originally Posted by gtflash
My rub rail isnt big enough to hook anything onto, and any deck or covered bow id fit, would obviously add weight
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what about gluing some fitting to take hooks under the rubbing strake.. ?
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Chris Stevens
Born fiddler
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21 January 2014, 10:20
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#6
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Member
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Mako Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 1,259
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I'd like to know more about this, what speed were being doing before and after fitting one?
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22 January 2014, 20:33
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#7
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Member
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
Join Date: Aug 2003
Posts: 1,824
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I dont have exact details. It appears with covered lightweight bow most people gained 5ish mph. One person reported increased bow steer so used bow lifting props but nevwr settled the boat with cover. None of my data. Just what others told me
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29 January 2014, 18:18
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#8
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Member
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Mako Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 1,259
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hmm. covered bow on a thunder cat? has to be worth a go!
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03 February 2014, 04:33
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#9
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Member
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
Join Date: Aug 2003
Posts: 1,824
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I think ill be trying it temporarily, if you can get it to stick some how. Why not
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03 February 2014, 07:23
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#10
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Member
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
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Have you got the engine height spot on? have you moved all the heavy stuff right to the back? Have you tried a few different props? I think all of these would offer at least as much if not more improvement in speed.
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Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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08 July 2016, 08:47
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#11
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Member
Country: Greece
Town: HERACLION
Make: MY ONE
Length: 9m +
Engine: 2*350
Join Date: Sep 2011
Posts: 220
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I think the regional systems less important when the hull is not built for high speeds
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