Reply
 
Thread Tools Search this Thread
 
Old 26 September 2011, 17:32   #11
Member
 
kubcat's Avatar
 
Country: Australia
Town: Sydney
Boat name: Lunasea
Make: Ribtec 890SX
Length: 8m +
Engine: Yamaha ME 421STI x 2
Join Date: Aug 2009
Posts: 470
Might be worth having a chat to the dealer or factory as it is a new boat so shouldn't have any steering or mount wear and they must have encountered the problem before.

Did I read it right, you raised the engine 1 inch on the transom? Did this make the chine walking better or worse? How about top speed?

As for trimming, trim in (propellor closest to the transom) till on the plane, then as suggested start trimming out and you will feel the boat going faster up to a point when the prop starts to slip. At this point bring it back in a touch.

Play in the steering makes it worse, so tighter steering will make it better but probably not eliminate it.

If your trim and engine height is right and your engine is centred, I think balance is your only other tool.

Stopped in the water with you sitting in the driving position, have a look at the port to starboard balance. Is it leaning to one side? If not, play around with front to rear balance.
__________________

__________________
kubcat is offline   Reply With Quote
Old 27 September 2011, 10:46   #12
Member
 
Country: Other
Town: Malta
Boat name: DeltaBay
Make: DeltaBay
Length: 5m +
Engine: IHonda BF90D
Join Date: Sep 2011
Posts: 72
Yes this morning went to the dealer and told him that the steering clearance is normal and he told me too that with the 60hp it is a good speed for a rib that i don’t agree with him i thing that i could have more from it . yes i raised the engine 1” and i think that it was better what i will try to do is to eliminate all the steering clearance as i am suspecting that it is all the causing the chine walking. I will try to buy a steering helm that have friction adjustment then will see what happened. Thanks all
__________________

__________________
Jason calleja is offline   Reply With Quote
Old 27 September 2011, 11:38   #13
Member
 
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
before you go buying things get out there and play with the trim. We have had any number of folk here with their boats that thought it was an on/off sorta switch. By trimming up at speed all their boating woes disappeared. I suspect it will all come right for you when you have been out there and done it for yourself.

Quote:
engine is centred
you would be better with the engine off set 1/1.5 inch to the right to counteract prop effect
__________________
Dave M
www.wavelengthtraining.co.uk
wavelength is offline   Reply With Quote
Old 28 September 2011, 04:16   #14
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Quote:
Originally Posted by wavelength View Post
you would be better with the engine off set 1/1.5 inch to the right to counteract prop effect
I have a similar size/ weight / HP and mine's dead centre - no chine walk or biased steering offset on mine.......



If your engine is fully down, I doubt it is even chine walking - for what it's worth as an experiment years ago I had an SR4 with a 25 on the back, and made it do exactly what you describe by putting the trim pin (no PT on that!) at the lowest hole. Opening the throttle felt like it was trying to do submarine impersonations, the stern lifted and it wobbled to & fro as the bow tried to go underwater!

Before you start mucking about & / or spending buckets of cash, play with the trim! Eek it up slowly until it starts to ventilate (cavitate) then notch it back down a tiny bit. You'll hear the engine star to "sing" as it hits the optimum trim position. There is also an argument for raising the stop pin up a couple of holes to prevent this happening accidentally if you are not paying attention. (mine is 3 holes up from the bottom, for what it's worth)

Also here is a description of chinewalking I wrote recently: Chine walking (post #8)
__________________
9D280 is offline   Reply With Quote
Old 28 September 2011, 06:46   #15
Member
 
Country: Other
Town: Malta
Boat name: DeltaBay
Make: DeltaBay
Length: 5m +
Engine: IHonda BF90D
Join Date: Sep 2011
Posts: 72
yes i read your description on chine walking and it helped me a lot and no it is not trying to go down but i think it is all coming from the steering. i will try to check the helm and if necessary will replace it as for me there is not so much speed that the rib is out completely on the keel. do you know what tipe of helm can i use that has an adjustmanet to eliminate the loose. thanks jason
__________________
Jason calleja is offline   Reply With Quote
Old 28 September 2011, 06:51   #16
Member
 
longjohn's Avatar
 
Country: UK - England
Town: Bournemouth
Boat name: Seadrive
Make: Capelli Tempest 470
Length: 4m +
Engine: Suzuki DF70
MMSI: 235079113
Join Date: Jul 2008
Posts: 541
I was borrowing a friend's Valiant V490 the other weekend and found that with only one up it chine walked badly at anything over 30knots with just me in the boat - however it was a lot more stable with a few more people on board.
I'd try fitting a hydrofoil to the outboard - can throughly recommend the StingRay Stealth.
__________________
longjohn is offline   Reply With Quote
Old 28 September 2011, 07:55   #17
Member
 
Country: Ireland
Town: Castlebar
Boat name: Clewless
Make: Valiant DR 490
Length: 4m +
Engine: 60 hp ETEC
MMSI: Awaitng one
Join Date: Oct 2007
Posts: 1,239
RIBase
The Hull in the V490 is the same as mine dr 490. I would be fearfull in mine at 30 kn. It would need to be very lightly loaded to achieve this speed. I usually have 30-40 kg of lead in the bow locker along with 60 lt of fuel and assorted fittings this has reduced its max speed to 26 - 27 kn. The boat is comfortable in most sea states at 18 -20 kn it gets lively at 23/24 kn. It can carry a load with ease and handles better with a load.

TSM
__________________
two stroke mick is offline   Reply With Quote
Old 28 September 2011, 13:30   #18
Member
 
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
Quote:
Before you start mucking about & / or spending buckets of cash, play with the trim
yep-think thats what I said
Quote:
If your engine is fully down, I doubt it is even chine walking
exactly thats why we have all said to trim it up
Quote:
no chine walk or biased steering offset on mine
no not for chine walking but for balance and to counteract any pull to one side-I would and do always offset but if yours is fine in t'middle then thats all good

Quote:
I usually have 30-40 kg of lead in the bow locker
I suspect that may well be his most useful tip yet once he gets the trim sorted out. Our little 4.3m humber assault with a 50 merc four stroke was well overpowered and evil at WOT. A bag of sand in the front both cushioned the anchor and stopped chine walking when the little bugga was at full chat
__________________
Dave M
www.wavelengthtraining.co.uk
wavelength is offline   Reply With Quote
Old 29 September 2011, 13:02   #19
Member
 
Country: UK - England
Town: Wraysbury
Boat name: Rubbitin
Make: Ribeye
Length: 8m +
Engine: 200 Merc
Join Date: Sep 2011
Posts: 10
Don't call us were call you.

Sent from my iPhone using Rib.net
__________________
gazb is offline   Reply With Quote
Old 11 October 2011, 14:16   #20
Member
 
Country: Other
Town: Malta
Boat name: DeltaBay
Make: DeltaBay
Length: 5m +
Engine: IHonda BF90D
Join Date: Sep 2011
Posts: 72
I have tried the rib after done settings to steering friction the ride was more comfortable at full trim out it was like flying on the waves but still chine walked. Now when you sad to add a sand bag for weight will it have to be on the front or if i add weight at the transom will stop chine walk?
__________________

__________________
Jason calleja 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 06:39.


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