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20-03-2004, 04:48 PM
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#2
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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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Dreamers!
__________________
__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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20-03-2004, 05:08 PM
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#3
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Registered User
Location: portsmouth
Occupation: car dealer
Interests: basic racing
Boat name: explosion
Boat make: backdraft
Engines: mercury xr2
Cruising area: solent
Join Date: Mar 2004
Location: portsmouth
Posts: 119
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physicaly impossible
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whatever floats your boat.....got one again
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20-03-2004, 09:32 PM
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#4
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hello
Join Date: Mar 2004
Posts: 2,739
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Maybe its fitted with a Ford speedo 
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20-03-2004, 10:28 PM
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#5
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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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Or searay!
__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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22-03-2004, 03:29 PM
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#6
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Registered User
Country: Hampshire
Location: The Solent
Occupation: IT
Boat name: Pepsea
Boat make: Tohatsu 6.6 Rib
Engines: Optimax 150
Join Date: Mar 2004
Location: The Solent
Posts: 205
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Dreaming
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22-03-2004, 03:58 PM
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#7
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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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__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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22-03-2004, 05:48 PM
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#8
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hello
Join Date: Mar 2004
Posts: 2,739
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That must be nearly 1 mph per hp,
Does a bigger swell make you go faster cause going down a big wave is like going down hill?
So, maybe my estimate of 110 was a little on the low side!!!
I reckon in a 20 foot swell with my 260 hp...................... 
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22-03-2004, 07:45 PM
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#9
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Registered User
Country: Canada
Location: Newfoundland
Interests: Spreading the good word about boats with toobs
Join Date: Mar 2004
Location: Newfoundland
Posts: 173
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'slot of it abart.............
'snot 94mph but there is a bloke who reckons on 60kts (thats 66mph for you boy racerz) from 2 x260hp in a 25 Triana. (Nice classic boat though!)
http://www.tmti.net/trianatropica/tropica.htm
EN 
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22-03-2004, 10:52 PM
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#10
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Registered User
Country: uk
Join Date: Mar 2004
Posts: 4
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yeah we had a laugh at this
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23-03-2004, 04:44 PM
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#11
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Registered User
Country: England
Location: South West
Occupation: Development engineer
Interests: Fast boats
Boat name: Xtreme
Boat make: Bernico 21
Engines: Mercury F1, 300 Drag, XR2 "Fingerported"
Cruising area: South West
Join Date: Mar 2004
Location: South West
Posts: 1,043
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What you mean it won't do this speed 
I've just part exchanged my 300 drag for this rig.
Cyco
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24-03-2004, 10:09 AM
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#12
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Registered User
Country: Hampshire
Location: The Solent
Occupation: IT
Boat name: Pepsea
Boat make: Tohatsu 6.6 Rib
Engines: Optimax 150
Join Date: Mar 2004
Location: The Solent
Posts: 205
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Look its true jet boats are faster than those with propellors! who was it that doubted a previous post, honestly experts ha!
T 
http://cgi.ebay.co.uk/ws/eBayISAPI.d...&category=1296
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24-03-2004, 10:14 AM
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#13
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Registered User
Location: portsmouth
Occupation: car dealer
Interests: basic racing
Boat name: explosion
Boat make: backdraft
Engines: mercury xr2
Cruising area: solent
Join Date: Mar 2004
Location: portsmouth
Posts: 119
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nice
__________________
whatever floats your boat.....got one again
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06-04-2004, 01:40 PM
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#14
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Registered User
Country: Hampshire
Location: The Solent
Occupation: IT
Boat name: Pepsea
Boat make: Tohatsu 6.6 Rib
Engines: Optimax 150
Join Date: Mar 2004
Location: The Solent
Posts: 205
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08-04-2004, 11:17 PM
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#15
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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of course it is! any boat on a trailer is as fast as the vehicle towing it!!!!!!
the OCR boys do around 60mph with 1.8 ltr 130hp engines.
so maybe in a large swell, downhill................................
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08-04-2004, 11:42 PM
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#16
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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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Well I'm not so sure, a 135hp ford v6/jet in didy speedboat might top 50, and back in 88 a 1.8 OCR B boat ran almost 69mph (Jeff Locock, on Windermere) probably with an old straight six Merc! so it's not completly out of the question.
__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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09-04-2004, 07:06 AM
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#17
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Registered User
Country: US
Location: Virginia
Interests: Quiet desperation
Boat name: A Little Noisy
Boat make: Excalibur 24
Engines: Express Racing 525
Cruising area: Mobjack Bay (where?)
Join Date: Mar 2004
Location: Virginia
Posts: 1,974
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94 mph possible but unlikely.
Theoretical top speeds can be easily calculated. Just take max revs X(times) propeller pitch/(divided by) gear ratio X .0094976. Multiply by the inverse of prop slippage (typically 75 -85% for a performance type monohull) and there you have it in mph.
Quick note to Essex Navee from a not quite 'Boy Racer' type - 60 kn is actually 69 mph since 1 knot = 1.15 mph.
__________________
I thought that having more patience was a result of my getting older. Turns out that I just don't give a sh*t.
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10-04-2004, 08:54 PM
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#18
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hello
Join Date: Mar 2004
Posts: 2,739
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Super unleaded, maybe that his secret!!!!
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10-04-2004, 09:33 PM
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#19
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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 Ned
Theoretical top speeds can be easily calculated. Just take max revs X(times) propeller pitch/(divided by) gear ratio X .0094976. Multiply by the inverse of prop slippage (typically 75 -85% for a performance type monohull) and there you have it in mph.
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So let me get this right, if I put 40" pitch props on my boat, it'll do 100mph!...shit, If I'd known it was as simple as just adding pitch I'd have done it years ago! 
__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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10-04-2004, 09:35 PM
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#20
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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 Ned
94 mph possible but unlikely.
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It would need to be at least 300hp
__________________
__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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