Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 11-10-2004, 08:29 PM   #1
Taz
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
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
__________________

Taz is offline   Reply With Quote
Old 11-10-2004, 10:24 PM   #2
numbskull
 
Jon Fuller's Avatar
 
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
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.
__________________

__________________
.

"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
Jon Fuller is offline   Reply With Quote
Old 12-10-2004, 08:09 PM   #3
Taz
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
So can i convert the box lower unit? Or buy a lower unit?

thanks johnson
__________________
[
Taz is offline   Reply With Quote
Old 14-10-2004, 04:07 PM   #4
Taz
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
Yeah the boxes are massive compared to the xr2, Looks like ill be selling the second engine doh!!!!!!
__________________
[
Taz is offline   Reply With Quote
Old 15-10-2004, 06:58 PM   #5
Taz
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
Matt you got any links to those boxes?

cheers
__________________
[
Taz is offline   Reply With Quote
Old 15-10-2004, 11:36 PM   #6
Registered User
 
Burty's Avatar
 
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer

Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
Send a message via AIM to Burty
what would happen if you had both props turnigng the same way?
Burty is offline   Reply With Quote
Old 15-10-2004, 11:49 PM   #7
Registered User
 
Burty's Avatar
 
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer

Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
Send a message via AIM to Burty
but why?
if you can hold on to 1 engine why not 2?
Burty is offline   Reply With Quote
Old 16-10-2004, 12:00 AM   #8
Senior Member
 
Louise's Avatar
 
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
Increased torque???
__________________
www.biboa.com
Louise is offline   Reply With Quote
Old 16-10-2004, 09:14 AM   #9
Taz
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
Any one know if a bridgeport box and mid would fit a 275?
__________________
[
Taz is offline   Reply With Quote
Old 16-10-2004, 09:48 AM   #10
Taz
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
cheers for the links matt see spares are cheap and a plenty,
__________________
[
Taz is offline   Reply With Quote
Old 17-10-2004, 10:31 AM   #11
Taz
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
The bridgeport box is tiny compared to the 275 s, might have to invest in a nose cone maybe that would help.
__________________
[
Taz is offline   Reply With Quote
Old 17-10-2004, 10:41 AM   #12
numbskull
 
Jon Fuller's Avatar
 
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
Stopping 'blow out' is exactly what the various nose cones are for
__________________
.

"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
Jon Fuller is offline   Reply With Quote
Old 17-10-2004, 11:51 AM   #13
Taz
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
Do you know where i can get one from ?
__________________
[
Taz is offline   Reply With Quote
Old 17-10-2004, 12:03 PM   #14
numbskull
 
Jon Fuller's Avatar
 
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
http://www.bobsmachine.com/


Do a search on this site for 'nose cone'
__________________
.

"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
Jon Fuller is offline   Reply With Quote
Old 17-10-2004, 04:40 PM   #15
The Doc
 
Captain Chaos's Avatar
 

Join Date: Mar 2004
Posts: 8,291
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
Captain Chaos is offline   Reply With Quote
Old 17-10-2004, 05:27 PM   #16
Taz
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
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?
__________________
[
Taz is offline   Reply With Quote
Old 17-10-2004, 05:37 PM   #17
The Doc
 
Captain Chaos's Avatar
 

Join Date: Mar 2004
Posts: 8,291
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
Captain Chaos is offline   Reply With Quote
Old 17-10-2004, 05:57 PM   #18
Taz
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
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
__________________
[
Taz is offline   Reply With Quote
Old 17-10-2004, 06:44 PM   #19
Taz
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
? Matt
__________________
[
Taz is offline   Reply With Quote
Old 17-10-2004, 06:53 PM   #20
numbskull
 
Jon Fuller's Avatar
 
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
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
__________________

__________________
.

"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
Jon Fuller is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 03:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
×