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26-11-2011, 07:58 PM
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#1
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Registered User
Country: england
Location: southampton
Occupation: engineer
Interests: lots
Boat make: scorpion 8.1
Engines: 250HO
Cruising area: solent
Join Date: Mar 2004
Location: southampton
Posts: 1,353
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Added weight
Bit of a how long is a piece of string question. What sort of impact would 150kg of weight have on a boat capable of 75mph. Maybe someone who has a similar sized bow tank, might know how much speed they loose on fill up??
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26-11-2011, 08:49 PM
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#2
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Registered User
Country: UK
Location: london
Occupation: Powerboat Skipper
Interests: Boats , bikes!
Boat name: Renegade
Boat make: GPV-RENEGADE
Engines: 150 HO etec
Cruising area: Thames, south coast, anywhere!
Join Date: Dec 2008
Location: london
Posts: 2,330
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What is the rig?
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Im re branding pepper spray as Arsehole Repellant.im going to make a fortune.
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26-11-2011, 09:23 PM
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#3
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Registered User
Country: shropshire england.
Location: oswestry
Occupation: Retired
Interests: Yodelling
Boat name: Veni Vidi Vici or Conked
Boat make: G.P.14
Engines: 4h.p. Mercury
Cruising area: Cap de Agde
Join Date: Feb 2009
Location: oswestry
Posts: 1,311
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Quote:
Originally Posted by glen76
Bit of a how long is a piece of string question. What sort of impact would 150kg of weight have on a boat capable of 75mph. Maybe someone who has a similar sized bow tank, might know how much speed they loose on fill up??
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Try two of yer mates up front,weigh them first,on flat out,off flat out,sorted.
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when in doubt trim outCARPE DIEM
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26-11-2011, 09:43 PM
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#4
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally Posted by glen76
Bit of a how long is a piece of string question. What sort of impact would 150kg of weight have on a boat capable of 75mph. Maybe someone who has a similar sized bow tank, might know how much speed they loose on fill up??
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Your amount of loss in speed will be very dependant on where you put the extra weight. Right back at there transom will make little difference, right up front, a lot!
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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26-11-2011, 09:49 PM
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#5
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Registered User
Country: shropshire england.
Location: oswestry
Occupation: Retired
Interests: Yodelling
Boat name: Veni Vidi Vici or Conked
Boat make: G.P.14
Engines: 4h.p. Mercury
Cruising area: Cap de Agde
Join Date: Feb 2009
Location: oswestry
Posts: 1,311
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Quote:
Originally Posted by Jon Fuller
Your amount of loss in speed will be very dependant on where you put the extra weight. Right back at there transom will make little difference, right up front, a lot!
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Sit yer two mates front and back on two diff runs,be interesting to see the diff,then chuck em off for your 3rd blast at full throttle,bound to be 3 diff speedo/GPS readings.
__________________
when in doubt trim outCARPE DIEM
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26-11-2011, 10:20 PM
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#6
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Registered User
Country: shropshire england.
Location: oswestry
Occupation: Retired
Interests: Yodelling
Boat name: Veni Vidi Vici or Conked
Boat make: G.P.14
Engines: 4h.p. Mercury
Cruising area: Cap de Agde
Join Date: Feb 2009
Location: oswestry
Posts: 1,311
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Quote:
Originally Posted by Jon Fuller
Your amount of loss in speed will be very dependant on where you put the extra weight. Right back at there transom will make little difference, right up front, a lot!
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OOPS JON.Who puts a bow tank by the transom?
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when in doubt trim outCARPE DIEM
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26-11-2011, 10:37 PM
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#7
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Registered User
Country: england
Location: southampton
Occupation: engineer
Interests: lots
Boat make: scorpion 8.1
Engines: 250HO
Cruising area: solent
Join Date: Mar 2004
Location: southampton
Posts: 1,353
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For arguments sake. 150kg upfront and also 150kg equally balanced over the whole boat. 8.1 stepped hull rib. 250 rude
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27-11-2011, 09:55 AM
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#8
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally Posted by dowdy
OOPS JON.Who puts a bow tank by the transom?
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The question didn't say he was asking for a bow tank comparison, it just said maybe someone with a similar weighted bow tank can comment...
Quote:
Originally Posted by glen76
What sort of impact would 150kg of weight have on a boat capable of 75mph.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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27-11-2011, 10:00 AM
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#9
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally Posted by glen76
For arguments sake. 150kg upfront and also 150kg equally balanced over the whole boat. 8.1 stepped hull rib. 250 rude
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I would say that you'd see less speed loss with a stepped hull than with a traditional V when the weight is placed fwd. weight up front is a top speed killer on a regular V.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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27-11-2011, 01:42 PM
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#10
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Registered User
Country: uk
Location: salcombe
Occupation: semi retired
Interests: racing(middle east class 3 6l)
Boat name: still no worries
Boat make: phantom18
Engines: 2.5 efi
Cruising area: salcombe
Join Date: Dec 2007
Location: salcombe
Posts: 499
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Bow tank
If the bow tank is right in front (lets say 2 feet) it won't need to be as big and you won't loose as much speed, it's more about balance than weight
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27-11-2011, 05:52 PM
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#11
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Registered User
Country: england
Location: southampton
Occupation: engineer
Interests: lots
Boat make: scorpion 8.1
Engines: 250HO
Cruising area: solent
Join Date: Mar 2004
Location: southampton
Posts: 1,353
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The boat has a huge bow tank. Over 6ft long and the width of te bost from bow. But it's decommissioned. It's a general overall effect of weight, such as in deck and structure I am interested in.
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