Reply
 
Thread Tools Search this Thread
 
Old 02 February 2007, 14:32   #1
Member
 
Country: Greece
Town: athens
Boat name: pytheasII
Make: scorpion
Length: 8m +
Engine: inboard, diesel 315
Join Date: Apr 2006
Posts: 9
Scorpion, Yanmar, Mercruiser

Hi all,
I am completely fed up with the Yanmar-Bravo 3-they all break apart at the end combina tion, and still trying to find a solution...

I am now on my second leg replacement on my Scorpion 8.75, and I know people that are curently on their third Bravo 3, and under 1000 hrs of operation, but I cant afford some alternative but pricey drives such as surface etc.

I won't get into much detail as I know from previous posts that many are aware of the problem, the reason I write here is to ask for advice whether replacing Bravo 3 with Bravo 1 would be a reasonable alternative , Bravo 1 being more reliable but probably not excellent in handling and manoevrability.

any comment will be valuable
__________________

__________________
vlad is offline   Reply With Quote
Old 02 February 2007, 16:08   #2
Member
 
Country: Norway
Town: DrÝbak
Make: RIBTECH 9,5
Length: 9m +
Engine: Volvo D6 370
Join Date: May 2006
Posts: 37
Drive

Hi Vlad!

Has done 420 hours so far on our Tornado 9,5 with 320 Mercruiser and
Bravo one XR diesel 1:50, and we have a Bravo on 26" prop.

So far everything looks fine, changed the oil on the drive every 100 hours,
Can for sure drive longer, but changes it for safety..

Our boat is very manouverable and works fine with the bravo one.

The reason i think is the small propeller wich spins as the turbo comes in and there is not so much torque on the propeller.

We are also very carfull when having airtime and pulls the throttle off befoe we hit the water.

Try a bravo one and see how it works on your boat.

Best wishes
Roy
__________________

__________________
www.rib.no
Dieselroy is offline   Reply With Quote
Old 02 February 2007, 16:10   #3
Member
 
Country: Norway
Town: DrÝbak
Make: RIBTECH 9,5
Length: 9m +
Engine: Volvo D6 370
Join Date: May 2006
Posts: 37
by the way, what speed do you get on your boat?
__________________
www.rib.no
Dieselroy is offline   Reply With Quote
Old 02 February 2007, 16:27   #4
Member
 
Country: Greece
Town: athens
Boat name: pytheasII
Make: scorpion
Length: 8m +
Engine: inboard, diesel 315
Join Date: Apr 2006
Posts: 9
Its good to hear that you still have good manoevrability with the Bravo one.
I am going to try a B1 when it will become available in a couple of months and excange my new B3 for it if I find it satisfactory.

My RIB is quite heavy, top speed just under 40 knots.Some claim B1 to be faster than the B3, while some in this forum say its slower....

Why did you go for the Bravo 1 leg? But of course you have Mercruiser..dont know if they have the same problems everybody seems to have with the YANMAR combination.
__________________
vlad is offline   Reply With Quote
Old 03 February 2007, 11:06   #5
RIBnet supporter
 
Brian's Avatar
 
Country: UK - Isle of Man
Town: Peel, IOM
Length: no boat
Join Date: Nov 2000
Posts: 2,277
RIBase
Huh. Only third Bravo in under 1000 hours!!
What luxury!

Try 5 in under 700 hours!!

Eventually I found that the problem was a misaligned engine. Alignment is absolutely critical.

Bravo 1s and 2s (I have tried them all!) will do you no good anyway, even if your engine alignment is fine. Changing to either of them will kilter your boat to port and this is only just about correctable by trim tabs. No good as a long term solution.

1s and 2s also severly reduce your topspeed regardles of propping.
__________________
Brian is offline   Reply With Quote
Old 03 February 2007, 14:32   #6
Member
 
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,688
Just a question by somebody who knows nothing about sterndrives, but why are they all rubbish? There are loads of posts on here about problems, surely there must be a market for a sterndrive that isn't made of cheese?
__________________
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...

Sent from my Computer, using a keyboard and mouse
BogMonster is offline   Reply With Quote
Old 04 February 2007, 12:43   #7
Member
 
Country: Norway
Town: DrÝbak
Make: RIBTECH 9,5
Length: 9m +
Engine: Volvo D6 370
Join Date: May 2006
Posts: 37
Hi again.

Our boat is quite heavy too, weighs about 2200 kg.
Max speed we have seen is 48 knots.

There is no problem with the torque kilting our boat to port.
Maybe its because of the weight.

I think you will have to try and change drive and find out because no boats are alike and testing is the only way to find out.

I would guess you could have the same drive/propeller combo as we have.

remember also that the Yanmar throws out alot of torque when it starts.
One propell and small as we have it will spin and not cause so much torque when you start, as rhe bravo 3 does . somewhat like a clutch.

good luck
__________________
www.rib.no
Dieselroy is offline   Reply With Quote
Old 04 February 2007, 12:56   #8
Member
 
Country: Greece
Town: athens
Boat name: pytheasII
Make: scorpion
Length: 8m +
Engine: inboard, diesel 315
Join Date: Apr 2006
Posts: 9
Brian, I have cruised -around your waters (guernesey)- on a 275 HP Mercruiser Bravo 1 powered Rib, and surely this boat she had a tendency of leaning to the port side... But the boat was much smaller (5.5m) and lighter..I wander if Dieselroy has the same leaning problem.

To me safety should be first at sea, so if I could correct everything using trim tabs why not?I am just tired of that when-it-will-break-again-feeling.
Actually I was going to install tabs anyway..I feel the boat needs them.

Conserning the speed, some people insist Bravo 1 is much faster, while others in this forum say it's slower than the B3...

My problems whith the outdrives did not come from faulse alignement...I am no expert in fiting engines but I know a lot of people with Bravo3 failures.Unless nobody can align an engine properly here in greece...(which is a serious possibility by the way!)

And Stephen, thats a good question...if you find one, I'll be the first to buy it.
__________________
vlad is offline   Reply With Quote
Old 04 February 2007, 13:02   #9
Member
 
Country: Greece
Town: athens
Boat name: pytheasII
Make: scorpion
Length: 8m +
Engine: inboard, diesel 315
Join Date: Apr 2006
Posts: 9
Thank Dieselroy!I just posted the question but seems that you answered before even reading it. GOOD TIMING
__________________
vlad is offline   Reply With Quote
Old 04 February 2007, 14:15   #10
Member
 
Country: Norway
Town: DrÝbak
Make: RIBTECH 9,5
Length: 9m +
Engine: Volvo D6 370
Join Date: May 2006
Posts: 37
Hi again.
Probably a bravo 1 is faster, but unless speed is your first goal, i think the overall performance counts most.

Also if you have a smaller propell it will not lean so much to the side.

We have tried both 24" and 28" bravo propeller but ended up with a 26".

Aligning your engine is easy if you have the right tool.
every mercruiser workshop should have one.

A good solution for tabs is looking at Volvo.

Whats the weight of your boat? seems you lack a lot fo speed

Roy
__________________

__________________
www.rib.no
Dieselroy 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 18:21.


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