Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 16-03-2019, 08:47 AM   #1
Registered User
 
nick1's Avatar
 
Country: uk
Occupation: Diamond/Jewellery/Rolex dealer
Boat name: Beyond Obsession
Boat make: P25
Engines: merc 2x200XS SSROS
Cruising area: solent/altea

Join Date: Mar 2008
Posts: 257
Twins vs single motors

Just a question i was asking myself.
What are the advantages/ disadvantages of twin motors or singles and why twins these days.I can understand i years gone by when motors were not pushing so much hp out so a couple or 3 were required but now we get to 400hp single surely the gain must be in a single set up with less weight .
I am sure there will be a lot of different views on this .
Cheers
__________________

nick1 is offline   Reply With Quote
Old 16-03-2019, 05:21 PM   #2
Registered User
 
Childsy's Avatar
 
Country: Uk, sometimes Dubai
Location: Newmarket, Suffolk
Occupation: Racehorse Exercise Rider
Interests: Powerboating, Squash, Running, Horseracing
Boat name: FAT BOY
Boat make: Cougar 27'
Engines: EVINRUDE G2 300
Cruising area: Orwell, Harwich, East Coast

Join Date: Sep 2012
Location: Newmarket, Suffolk
Posts: 212
Send a message via AIM to Childsy
Quote:
Originally Posted by nick1 View Post
Just a question i was asking myself.
What are the advantages/ disadvantages of twin motors or singles and why twins these days.I can understand i years gone by when motors were not pushing so much hp out so a couple or 3 were required but now we get to 400hp single surely the gain must be in a single set up with less weight .
I am sure there will be a lot of different views on this .
Cheers
I'm no expert but I think the biggest gain with running a twin setup has to be the handling with the 2 props counter rotating against each other and eliminating possible prop torque with a single setup, as you said, you can now bolt on up to a 400 on a boat like yours, there is a guy in Norway with a P25 running a 400r which previously ran as a double setup at sometime during its life, he posted on here with various results with engine heights & props etc. with the 400r with very good results in all areas.
__________________

Childsy is offline   Reply With Quote
Old 16-03-2019, 05:26 PM   #3
Registered User
 
Childsy's Avatar
 
Country: Uk, sometimes Dubai
Location: Newmarket, Suffolk
Occupation: Racehorse Exercise Rider
Interests: Powerboating, Squash, Running, Horseracing
Boat name: FAT BOY
Boat make: Cougar 27'
Engines: EVINRUDE G2 300
Cruising area: Orwell, Harwich, East Coast

Join Date: Sep 2012
Location: Newmarket, Suffolk
Posts: 212
Send a message via AIM to Childsy
Quote:
Originally Posted by nick1 View Post
Just a question i was asking myself.
What are the advantages/ disadvantages of twin motors or singles and why twins these days.I can understand i years gone by when motors were not pushing so much hp out so a couple or 3 were required but now we get to 400hp single surely the gain must be in a single set up with less weight .
I am sure there will be a lot of different views on this .
Cheers
http://www.boatmad.com/forum/f3/phan...00r-29810.html

Take a read of this, the guy in Norway I mentioned earlier...
Childsy is offline   Reply With Quote
Old 16-03-2019, 10:24 PM   #4
Registered User
 
nick1's Avatar
 
Country: uk
Occupation: Diamond/Jewellery/Rolex dealer
Boat name: Beyond Obsession
Boat make: P25
Engines: merc 2x200XS SSROS
Cruising area: solent/altea

Join Date: Mar 2008
Posts: 257
Twins vs single

Thanks for the info very informative .But i do think that sounds like a set up for glass flat water in a bang straight line .It looks like a single engine definitely quicker under these conditions.But what in real sea conditions is there any advantage of twins .When you think twice the cost ish twice the fuel just double everything except hull.
nick1 is offline   Reply With Quote
Old 19-03-2019, 03:47 PM   #5
Registered User
 
Burty's Avatar
 
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer

Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,350
Send a message via AIM to Burty
your P25 with a single 300 will be just as fast and easy to handle if setup right as it is with your twins, will also be a lot less hassle to maintain and cheaper to run however they don't look or sound as cool
Burty is offline   Reply With Quote
Old 19-03-2019, 05:38 PM   #6
Registered User
 
nick1's Avatar
 
Country: uk
Occupation: Diamond/Jewellery/Rolex dealer
Boat name: Beyond Obsession
Boat make: P25
Engines: merc 2x200XS SSROS
Cruising area: solent/altea

Join Date: Mar 2008
Posts: 257
Twins

Blimey bloody expensive to sound nice a look good. 😂
nick1 is offline   Reply With Quote
Old 20-03-2019, 01:08 AM   #7
Registered User
 
Arrow830's Avatar
 
Country: Sweden
Location: Stockholm, Sweden
Occupation: Advertising Angency
Interests: Boats n Bee...
Boat make: Activator 32 1x1095hp SSM#VI
Engines: Chevy by W&E 572ci
Cruising area: Stockholm, baltic sea

Join Date: Jan 2005
Location: Stockholm, Sweden
Posts: 246
Did not manage to test this Activator yet that we rigged fall 2018. Looking forward to the test together with the owner. First and only Swede built Activator with twin setup. Activator 28OR Seamless.
Attached Thumbnails
Click image for larger version

Name:	acti-syl-25.jpg
Views:	64
Size:	94.7 KB
ID:	49822  
__________________
Mange Wåhlstedt
www.boatsite.se
www.shootout.se
Arrow830 is offline   Reply With Quote
Old 20-03-2019, 08:19 AM   #8
Registered User
 
nick1's Avatar
 
Country: uk
Occupation: Diamond/Jewellery/Rolex dealer
Boat name: Beyond Obsession
Boat make: P25
Engines: merc 2x200XS SSROS
Cruising area: solent/altea

Join Date: Mar 2008
Posts: 257
Twins vs singles

Beautiful.But will that not be very rear end heavy.?
nick1 is offline   Reply With Quote
Old 21-03-2019, 11:28 PM   #9
Registered User
 
Arrow830's Avatar
 
Country: Sweden
Location: Stockholm, Sweden
Occupation: Advertising Angency
Interests: Boats n Bee...
Boat make: Activator 32 1x1095hp SSM#VI
Engines: Chevy by W&E 572ci
Cruising area: Stockholm, baltic sea

Join Date: Jan 2005
Location: Stockholm, Sweden
Posts: 246
Quote:
Originally Posted by nick1 View Post
But will that not be very rear end heavy.?

I hope so. Then the owner can use the 350 litre ballast tank more frequently

It has also A built in 450 litre gas tank placed in center of the boat.
__________________

__________________
Mange Wåhlstedt
www.boatsite.se
www.shootout.se
Arrow830 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 11:29 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.