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11-10-2004, 08:29 PM
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#1
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Registered User
Country: Essex
Location: Great Stambridge Essex
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Counter rotating
How do you run twin outboards ive heard of couter rotating engines but how does it work does the gearbox run in reverse?. I wanted to try putting 2x 275 merc on my phantom can i run one engine in reverse? or do i change one prop to compensate?
Cheers for any info
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11-10-2004, 10:24 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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You can't just run a standard box in reverse, you need a dedicated left hand rotation lower unit. sinse about '90 a shiftable left hander (with full FWD-N-RVS) has been available, before that, bespoke, locked in gear left hand boxes were custom built purely for racing with twins, but I would think most are in museums now.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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12-10-2004, 08:09 PM
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#3
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
Cruising area: Essex Marina/crouch southeast coast
Join Date: Sep 2004
Location: Great Stambridge Essex
Posts: 2,033
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So can i convert the box lower unit? Or buy a lower unit?
thanks johnson
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14-10-2004, 04:07 PM
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#4
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
Cruising area: Essex Marina/crouch southeast coast
Join Date: Sep 2004
Location: Great Stambridge Essex
Posts: 2,033
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Yeah the boxes are massive compared to the xr2, Looks like ill be selling the second engine doh!!!!!!
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15-10-2004, 06:58 PM
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#5
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
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Matt you got any links to those boxes?
cheers
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15-10-2004, 11:36 PM
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#6
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Registered User
Country: UK
Location: Weston Super Mare
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what would happen if you had both props turnigng the same way?
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15-10-2004, 11:49 PM
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#7
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Registered User
Country: UK
Location: Weston Super Mare
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but why?
if you can hold on to 1 engine why not 2?
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16-10-2004, 12:00 AM
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#8
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Senior Member
Country: UK
Location: Reading
Occupation: Being a mummy
Interests: Cruising
Boat name: Blue Ice
Boat make: Scorpion 7.5m RIB
Engines: Yamaha 200 hpdi
Cruising area: Solent
Join Date: Mar 2004
Location: Reading
Posts: 563
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Increased torque???
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16-10-2004, 09:14 AM
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#9
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
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Any one know if a bridgeport box and mid would fit a 275?
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16-10-2004, 09:48 AM
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#10
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Registered User
Country: Essex
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cheers for the links matt see spares are cheap and a plenty,
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17-10-2004, 10:31 AM
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#11
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Registered User
Country: Essex
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The bridgeport box is tiny compared to the 275 s, might have to invest in a nose cone maybe that would help.
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17-10-2004, 10:41 AM
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#12
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numbskull
Country: United Kingdom
Location: South
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Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Stopping 'blow out' is exactly what the various nose cones are for
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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17-10-2004, 11:51 AM
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#13
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
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Do you know where i can get one from ?
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17-10-2004, 12:03 PM
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#14
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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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http://www.bobsmachine.com/
Do a search on this site for 'nose cone'
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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17-10-2004, 04:40 PM
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#15
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The Doc
Join Date: Mar 2004
Posts: 8,291
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if you want to avoid agro.....I think bobs will do all the work for you.
I.e....i'd buy the c/r box and have it sent to bobs for them to fit the cone & L/w pickup. Then get them to send the cone kit for the standard rot unit you already got & you'll have one to measure up to & copy.
then all you need is a phantom 23 to stick'm both on
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17-10-2004, 05:27 PM
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#16
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
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Join Date: Sep 2004
Location: Great Stambridge Essex
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Would be nice although i still have the prob i have 25" mids and not 20" unless i got a jack plate for each.
Is bobs any good? You bought nething from there?
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17-10-2004, 05:37 PM
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#17
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The Doc
Join Date: Mar 2004
Posts: 8,291
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I have not bought anything.....but I do have a bobs manual lifter (6inch setback).
if ya doing twins.......wouldnnt you better of with a gill bracket.......custom welded up or sommin??
I'm the wrong fella to be asking about that.........but cant help to think a P20 is way tooo small for all this!
Bobs.....is a well known company....id buy with confidence
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17-10-2004, 05:57 PM
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#18
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
Cruising area: Essex Marina/crouch southeast coast
Join Date: Sep 2004
Location: Great Stambridge Essex
Posts: 2,033
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Ill leave one engine on the p20 for know for fun until a bigger boat comes along. Dont wanna sell your lifter do ya?, sent bob email will order some goodies next week
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17-10-2004, 06:44 PM
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#19
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
Cruising area: Essex Marina/crouch southeast coast
Join Date: Sep 2004
Location: Great Stambridge Essex
Posts: 2,033
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? Matt
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17-10-2004, 06:53 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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I reckon if you put twin 275's on a bracket, on a P20, you'd have massive boyancy problems, even twin 300's on brackets on a P28 look arse heavy, and thats a way longer, and wider boat
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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