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15-05-2006, 04:54 PM
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#61
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Registered User
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe
Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
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Quote:
Originally posted by Matt
Except the opti is much less of a DIY motor if you plan to maintain it yourself.
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Is it not more reliable though ?
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__________________
Loving the Spitfire with a 25HP Mercury
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15-05-2006, 04:56 PM
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#62
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Registered User
Join Date: Mar 2004
Posts: 6,891
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That's the theory
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15-05-2006, 05:01 PM
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#63
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Registered User
Country: England
Location: Southampton
Boat name: Intrepid & Jaws
Boat make: R*b & Zapcat
Engines: 2x 150hp Yamaha HPDI + Tohatsu 50hp
Join Date: Jan 2006
Location: Southampton
Posts: 180
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Now im confused about what to do!! lol
The one with the opti doesnt look as good...
Will there be much speed difference?
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15-05-2006, 05:41 PM
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#64
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Registered User
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2
Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
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Quote:
Originally posted by Captain Chaos
a personal thing............... but i'd have the opti EVERY time.
smoother, quiter, newer, more fuel efficient
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And slower, And weighs more ! 
__________________
PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
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15-05-2006, 05:56 PM
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#65
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The Doc
Join Date: Mar 2004
Posts: 8,291
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Yes................ but that 21 will still see near 70mph, which for a pleasure boat is quite reasonable.
I'd be happy in my knowledge I own "new-tech" and can go out & do 68mph all day for £60 than own a 2.4 thats donkeys years old and pay treble the cost to perhaps do 70-75mph
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15-05-2006, 05:57 PM
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#66
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The Doc
Join Date: Mar 2004
Posts: 8,291
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Quote:
Originally posted by benc
Now im confused about what to do!! lol
The one with the opti doesnt look as good...
Will there be much speed difference?
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has the opti one been raced?
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15-05-2006, 08:10 PM
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#67
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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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Quote:
Originally posted by Johnny Boat Dude
That said 'Pure Adrenaline' had an XR2 drop on cowl and that one doesn't.
The date on the photo looks like 2004???
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here is the boat
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15-05-2006, 11:14 PM
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#68
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Registered User
Country: U.K
Location: Christchurch/Nottingham
Occupation: Student
Interests: My brothers boat
Boat name: My brothers
Boat make: Ring 15
Engines: 70HP Tohatsu
Join Date: Dec 2004
Location: Christchurch/Nottingham
Posts: 178
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Recent engine on this 21, although the boat looks alittle older,
http://www.boatsandoutboards.co.uk/view/F100359
I would take the graphics off and it would probably look better.
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15-05-2006, 11:21 PM
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#69
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Registered User
Country: England
Location: Southampton
Boat name: Intrepid & Jaws
Boat make: R*b & Zapcat
Engines: 2x 150hp Yamaha HPDI + Tohatsu 50hp
Join Date: Jan 2006
Location: Southampton
Posts: 180
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My main reason for getting a hardboard is because I want speed.
My current rib does 50mph... so want something that has a noticable difference... that last one says it does 60 mph... its a 200hp engine... why would the optimax 200hp do 70?
If both engines output 200hp Im guessing its down to weight of boat+engine and the prop size?
Or am I missing something?
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15-05-2006, 11:28 PM
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#70
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Registered User
Join Date: Mar 2004
Posts: 6,891
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People often believe their boats are faster than they really are. Cheap speedos typically read 15% over. Or as their known on boatmad, Searay speedos.
ie Read 70, actually doing 61. They all seem overread by about the same, so it's gotta be a "fix", but hey, my formula's a 70 mph boat, I've seen it on the speedo. 
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15-05-2006, 11:32 PM
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#71
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Registered User
Country: England
Location: Southampton
Boat name: Intrepid & Jaws
Boat make: R*b & Zapcat
Engines: 2x 150hp Yamaha HPDI + Tohatsu 50hp
Join Date: Jan 2006
Location: Southampton
Posts: 180
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hehe, understood.
I've measured mine via my garmin gps... seems to be fairly accurate. - 43.1 knots.. not bad for what I have  probably another couple of knots there.. maybe.
What speed will a phantom 21 do realisticly with a 200hp?
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15-05-2006, 11:35 PM
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#72
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Registered User
Join Date: Mar 2004
Posts: 6,891
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I believe icecreamtruck's one does 73 with a 225
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15-05-2006, 11:35 PM
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#73
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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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A well setup standard built P21 with a 200 on the back will do 65mph, 70 seems a bit in dream land
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15-05-2006, 11:44 PM
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#74
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Registered User
Join Date: Mar 2004
Posts: 6,891
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How fast does Ian's boat run?
Quote:
Originally posted by Burty
70 seems a bit in dream land
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15-05-2006, 11:46 PM
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#75
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The Doc
Join Date: Mar 2004
Posts: 8,291
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pushing 70, but not quite.
But then again........... I hear he manages a good average speed round a course!
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16-05-2006, 08:44 AM
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#76
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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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Quote:
Originally posted by Matt
How fast does Ian's boat run?
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he told me 68MPH max but thats a race boat with a bullet box and no back seat trim carpet etc. so 65 for a standard boat is about right
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16-05-2006, 09:11 AM
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#77
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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 Burty
he told me 68MPH max but thats a race boat with a bullet box
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Just for the record, the bullet box, IMHO will make no difference whatsoever to top speed with a sub 80mph boat. Except maybe in giving the opportunity to run higher coz of the LWP.
__________________
.
"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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16-05-2006, 09:16 AM
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#78
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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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but running higher means less geargase in the water which means less drag which means more speed?
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16-05-2006, 09:39 AM
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#79
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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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Yes, but my point is, that the pointed lower is in itself, no advantage unless you're goin fkkn quick anyways. Even if they do look sexy.
Aren't the regular style lowers available with LWP's now anyway?
__________________
.
"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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16-05-2006, 09:40 AM
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#80
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Registered User
Country: England
Location: Southampton
Boat name: Intrepid & Jaws
Boat make: R*b & Zapcat
Engines: 2x 150hp Yamaha HPDI + Tohatsu 50hp
Join Date: Jan 2006
Location: Southampton
Posts: 180
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OK, call me dumb... whats a bullet box 
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