Reply
 
Thread Tools Search this Thread
 
Old 31 March 2005, 08:21   #1
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
Why does my boat rock?

When I get to higher speeds 40knots +... the boat starts to rock slowly from side to side, why would this be? and how would I sort it?

Thanks

Ben
__________________

__________________
benc is offline   Reply With Quote
Old 31 March 2005, 08:51   #2
Member
 
Country: UK - England
Town: Manchester - Abersoc
Boat name: MeMe
Make: SeaPro 595CC
Length: 6m +
Engine: Mercury 115 4S
Join Date: Jul 2003
Posts: 1,681
Send a message via MSN to MeMe
40 plus knots.......

.....you lucky sod, came the cry from most of the Forum. Having recently endured the same experience, I found triming in helped but reduced the speed at the same time - a double edge sword as they say !
__________________

__________________
Buy it & Use it, then sell it and buy something bigger
MeMe is offline   Reply With Quote
Old 31 March 2005, 08:57   #3
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
im only at about 75% throttle... so would really like to sort it out... ill give trimming a go tonight.

Anyone in the solent tonight?
__________________
benc is offline   Reply With Quote
Old 31 March 2005, 09:28   #4
Member
 
Country: UK - England
Town: West Sussex
Boat name: Grey Mist
Make: Parker 800 Baltic
Length: 8m +
Engine: 2xMercury Diesel 170
Join Date: Oct 2002
Posts: 3,844
RIBase
Quote:
Originally Posted by benc
im only at about 75% throttle... so would really like to sort it out... ill give trimming a go tonight.

Anyone in the solent tonight?
Hi Ben

and this is the rib in question at LAmpton Marina. Nice looking beast

photo courtesy of Phil Chitty
Attached Thumbnails
Click image for larger version

Name:	100_3699a.JPG
Views:	387
Size:	155.1 KB
ID:	11156  
__________________
Andre
Andre is offline   Reply With Quote
Old 31 March 2005, 09:40   #5
Member
 
Country: UK - Channel Islands
Town: Guernsey
Boat name: Charger
Make: Prosport
Length: 7m +
Engine: Yam 200HP OB
Join Date: Jul 2004
Posts: 90
I find the same thing, strangely its more pronounced in flatter water, a bit of chop seems to have a damping effect.

I think it might be due to steering movement having a much greater affect at speed, try and keep your steering adjustments really small. Trimming helps too, but slows you down.
__________________
Squirrel is offline   Reply With Quote
Old 31 March 2005, 09:41   #6
Member
 
Country: UK - England
Town: Farnborough
Boat name: Eleven
Make: Arrow
Length: 8m +
Engine: 557cu, 700hp
Join Date: Jul 2003
Posts: 1,259
Chinewalking?
__________________
Matt is offline   Reply With Quote
Old 31 March 2005, 09:56   #7
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
Andre, indeed it is! They are the guys who work out the marina... they looked after getting it in/out of the water at LHampton marina for us.

Yeah, I love the boat - but ribs are new to me - as is two engines!

MadMat, sorry I dont understand the ChineWalking term :$
__________________
benc is offline   Reply With Quote
Old 31 March 2005, 10:35   #8
Member
 
Country: Sweden
Town: Stockholm
Boat name: Osprey & Ring
Make: Osprey & Ring
Length: 9m +
Engine: Plenty
Join Date: Mar 2003
Posts: 860
Ben;

Do you have a pic taken from behind on shore.
Hard to se on the picture but they maybe look little high installed.
Take them down 18mm can sort the problem if they are to high.
__________________
www.grandrib.se
Petrov is offline   Reply With Quote
Old 31 March 2005, 10:42   #9
Member
 
Country: Sweden
Town: Stockholm
Boat name: Osprey & Ring
Make: Osprey & Ring
Length: 9m +
Engine: Plenty
Join Date: Mar 2003
Posts: 860
Hmmm, does it excist a counter rotating Yamaha 115hp.
Otherwise that could be the problem, 2 right rotating engines will push the boat to the side when driving and when you coming up high speed you get less wet surface and than balance of boat will be more effected.
__________________
www.grandrib.se
Petrov is offline   Reply With Quote
Old 31 March 2005, 10:48   #10
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
Petrov, sorry I have no prictures from behind the boat with the engines down, I have always had the engines up while it was been out of the water.

Interesting about the engines both spinning the same direction, I will take a look tonight, this could possibly be the case.

If it is, is it possible to change the direction at all, or does it mean a whole new engine?
__________________
benc is offline   Reply With Quote
Old 31 March 2005, 10:57   #11
Member
 
Country: Sweden
Town: Stockholm
Boat name: Osprey & Ring
Make: Osprey & Ring
Length: 9m +
Engine: Plenty
Join Date: Mar 2003
Posts: 860
Hi Benc;

A whole new engine but i dont think Yamaha has a couter rotating 115hp.
I can be wrong, will check on Yamahas homepage.
__________________
www.grandrib.se
Petrov is offline   Reply With Quote
Old 31 March 2005, 10:59   #12
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
Hmm, is there not another way this can be adjusted?
__________________
benc is offline   Reply With Quote
Old 31 March 2005, 11:04   #13
Member
 
Country: Sweden
Town: Stockholm
Boat name: Osprey & Ring
Make: Osprey & Ring
Length: 9m +
Engine: Plenty
Join Date: Mar 2003
Posts: 860
Quote:
Hmm, is there not another way this can be adjusted?
I was wrong, they have counter rotating in 4-stroke.
Than i would guess that the engines are to high, my old boat had 2 X 300HPDI and only 8,2m long boat and my wobbeling came around 59-60 knots.
I lowered the engine and it disapered but than i got the galopping effect instead.
But the boat was a little over powered, with 2 X 250 i would never have the problem.
__________________
www.grandrib.se
Petrov is offline   Reply With Quote
Old 31 March 2005, 11:07   #14
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
ok, ill have a look tonight

Thanks

Petrov
__________________
benc is offline   Reply With Quote
Old 31 March 2005, 11:09   #15
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
http://dogscogs.com/gallery/album01/DSCF0765?full=1

Hmm, edited as it didnt make sense

Looking at this picture, it looks as though I already have one counter rotating engine, as it looks like the propellers spin opposite ways.
__________________
benc is offline   Reply With Quote
Old 31 March 2005, 11:11   #16
Member
 
Country: Sweden
Town: Stockholm
Boat name: Osprey & Ring
Make: Osprey & Ring
Length: 9m +
Engine: Plenty
Join Date: Mar 2003
Posts: 860
Yes it`s a counter rotating, it`s really hard to se on pic but they maybe look little high.
__________________
www.grandrib.se
Petrov is offline   Reply With Quote
Old 31 March 2005, 12:35   #17
Member
 
Country: UK - England
Town: Essex/Vendee
Boat name: shockwave,Voluntry 2
Make: Pac 22/ searider5.4
Length: 6m +
Engine: 180hp turbo,yam 90
Join Date: Nov 2004
Posts: 1,015
Have you tried putting extra weight on bow before you adjust engine height this will help
__________________
PeterR is offline   Reply With Quote
Old 31 March 2005, 12:54   #18
Member
 
Country: UK - England
Town: Portsmouth
Boat name: Sting
Make: Tornado 6.8
Length: 6m +
Engine: Yam 200 HPDI
Join Date: Oct 2002
Posts: 645
Send a message via MSN to Andy
Give Barnet Marine a call and ask them. Laurence Lock is your man, he knows all there is to know about Tornados
__________________
Andy

www.badviz.com
Andy is offline   Reply With Quote
Old 31 March 2005, 15:00   #19
Member
 
benc's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Intrepid
Make: Tornado
Length: 7m +
Engine: Twin 150 Yamaha HPDI
MMSI: 235066402
Join Date: Mar 2005
Posts: 1,319
Send a message via Skype™ to benc
Thanks for the suggestions guys, I tried to go down and try adjusting trim today - but when I got there found my battery was flat so going back again tomorrow night hopefully. and this weekend is meant to be nice so will play then if not.
__________________
benc is offline   Reply With Quote
Old 31 March 2005, 15:13   #20
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
And check for play in the steering system.
__________________

__________________
Hightower 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




All times are GMT -5. The time now is 00:46.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.