Reply
 
Thread Tools Search this Thread
 
Old 11 January 2006, 14:21   #1
nik
Member
 
Country: UK - England
Town: east cowes
Make: academic
Length: no boat
Engine: fresh air
MMSI: N/A
Join Date: Sep 2003
Posts: 540
engine size

Hello all,

Can anyone tell me how well a 5.3m ocean pro (300Kg) would go with a 50hp 4 stroke o/b, a suzuki maybe.

Thanks, Nick.
__________________

__________________
nik is offline   Reply With Quote
Old 11 January 2006, 14:25   #2
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
that would be fine but not so fast whats the max power for the transom is it around 90
__________________

__________________
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 11 January 2006, 15:20   #3
nik
Member
 
Country: UK - England
Town: east cowes
Make: academic
Length: no boat
Engine: fresh air
MMSI: N/A
Join Date: Sep 2003
Posts: 540
I have been told around 27 knots. Does that sound on the mark?
Nick.
__________________
nik is offline   Reply With Quote
Old 11 January 2006, 15:24   #4
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
yep maybe a littel less it will definitely plane the extra Hp just gives you more speed and more snappy acceleration but the fifty will do it!
__________________
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 11 January 2006, 15:30   #5
nik
Member
 
Country: UK - England
Town: east cowes
Make: academic
Length: no boat
Engine: fresh air
MMSI: N/A
Join Date: Sep 2003
Posts: 540
Thanks
__________________
nik is offline   Reply With Quote
Old 11 January 2006, 19:57   #6
Member
 
Country: UK - England
Town: swansea
Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 170
itll do job

hey there, the 50 hp should do the job, but it depepnds how many ppl would be on the rib usually, if more than 3 i would suggest going for larger hp, as the ocean pro can take pretty large engines, i would have thought a 70hp suzuki would fit the bill, and is also the same weight/size as the 60hp! i have the 6.3m ocean pro, bought last year, with a 140hp it is balanced, and my previous boat was a 4.7m zodiac pro 3, with 50 hp, it had a shallower vee than the humber, and the 50 made it a nippy boat, but although its lighter than the 5.3m ocean pro, it was working very hard at 30 knots/ish, with 4ppl on board, would have suited a 60hp i think, so with this in mind, it may be worth considering higher hp! itll be interesting to see what you decide, best of luck, jonathan
__________________
xpertski is offline   Reply With Quote
Old 12 January 2006, 18:46   #7
nik
Member
 
Country: UK - England
Town: east cowes
Make: academic
Length: no boat
Engine: fresh air
MMSI: N/A
Join Date: Sep 2003
Posts: 540
Its just that there is a big price hike from 50hp to 60hp
__________________
nik is offline   Reply With Quote
Old 12 January 2006, 18:59   #8
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
Nik, in my opinion it's good to max the power on a rib, however when you consider the extra expense in buying ans running a bogger engine is too much go for the smaller one.

Just get out on the water and have a good time,

personally I'd stick a 2stroke 70 on in preference to any 4 stroke but theres an awful lot of 4 stroke owners would disagree!.

Are you buying the engine new!
__________________
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 13 January 2006, 14:25   #9
nik
Member
 
Country: UK - England
Town: east cowes
Make: academic
Length: no boat
Engine: fresh air
MMSI: N/A
Join Date: Sep 2003
Posts: 540
Up to now I have not paid too much attention to outboards, favouring the idea of a diesel.

But now I have scaled back my ambitions, which means going for an outboard.

The sum total of my knowledge is:
Fourstroke good but heavy
Old twostroke expensive to run but responsive
New twostroke much better than old, but is it better than four stroke.

Also, are modern twostrokes cheaper than fourstrokes on an equal Hp rating?

Nick
__________________
nik is offline   Reply With Quote
Old 13 January 2006, 17:47   #10
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
It depends on how much you'll use it and how concerned you are with running costs v performance. I'd agree with Rogue Wave and go for a two stroke 70 ish (maybe second hand - cheap?) to start with and see how you get on. It would be cheaper than a 50 4-stroke and give a lot more fun, especially if you have a crowd on board, which is likely in a 5m+ RIB on a nice summer's day. There's nothing worse than an under-powered boat, even if it is cheap to run. I'd try to get a test run on a similar size/weight boat to what you have in mind, if you can find one with a 50 hp, and see what you think of it.
Good luck.
__________________

__________________
Downhilldai is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:58.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.