Reply
 
Thread Tools Search this Thread
 
Old 03 June 2008, 04:19   #1
Member
 
Country: UK - England
Town: gateshead
Boat name: rubber duck
Make: humber
Length: 5m +
Engine: mercury 115 opti 08
Join Date: Jun 2008
Posts: 40
destroyer leaning under full power at speed

hello,i have just bought a 5.3 humber destroyer and a 115 optimax ,(have not had a chance to speak to the marine shop who fitted it to see if they have any suggetions)but sometimes we can be going along nice and then when we open the throttle sometimes the boat will lean to the left quite a bit and once or twice has done it to the right,also the steering becomes very hard to turn to the left when you put a few thousand revs on but is always fine to the right.I know you can adjust the plate above prop which i need to try.Has anyone had the same experience or any suggestions?thanks!
Attached Thumbnails
Click image for larger version

Name:	DSC00350.jpg
Views:	191
Size:	51.1 KB
ID:	35141   Click image for larger version

Name:	DSC00344.jpg
Views:	198
Size:	71.2 KB
ID:	35142  
__________________

__________________
montu is offline   Reply With Quote
Old 03 June 2008, 05:24   #2
J S
Member
 
Country: UK - England
Town: N.Wales/Southampton
Make: Zodiac
Length: 3m +
Engine: Honda 15hp
Join Date: Mar 2006
Posts: 449
Have you tried trimming up/out when you start to apply more power. The stiffer steering is very common if you don't use the trim at speed.

V.Nice Rib BTW

Hope that helps

James
__________________

__________________
J S is offline   Reply With Quote
Old 03 June 2008, 05:56   #3
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,894
RIBase
Trim

Looks like quite a lot of power on a 5.3 - should be lively!

As said before try altering the trim for different speed settings. With my 5.4 searider with 90hp and old fashioned cable steering the trim had to be adjusted in order to balance the steering up.

Play with the trim until the steering goes light.
__________________
Searider is offline   Reply With Quote
Old 03 June 2008, 06:29   #4
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by montu View Post
I know you can adjust the plate above prop which i need to try.
Do this first. Aim for a situation where when you are cruising the boat drives a straight line. Your engine manual should tell you how to adjust the tab.

The rotation of the propeller tends to lean the boat to the left under power. Don't confuse this with the boat listing towards a side wind. If the wind is blowing from the right, the boat will lean to the right and vice versa. It's actually your steering against the wind which causes the list but it doesn't feel like that.
Quote:
also the steering becomes very hard to turn to the left when you put a few thousand revs on but is always fine to the right.
When properly set, the tab will help eliminate that but if you apply lots of revs at slow speed with the steering set to the left, the forces are so great you may not be able to wind the steering back without reducing the revs. Take care with that; it's a normal feature and you'll need to learn to handle it.
__________________
JW.
jwalker is offline   Reply With Quote
Old 03 June 2008, 06:48   #5
Member
 
Country: UK - England
Town: gateshead
Boat name: rubber duck
Make: humber
Length: 5m +
Engine: mercury 115 opti 08
Join Date: Jun 2008
Posts: 40
thanks for those comments,i will give them a try.Have just spoke to sue at humber and she said the company who fitted the engine may not have offset it.
__________________
montu is offline   Reply With Quote
Old 03 June 2008, 06:50   #6
Member
 
Country: UK - Wales
Town: Pwllheli-North Wales
Boat name: Delta 1
Make: Delta
Length: 6m +
Engine: Mariner 90hp Optimax
Join Date: Mar 2001
Posts: 2,367
Hi

We are currently fitting engines 40mm to Starboard on Destroyers, they do love trim as James Said.

Jono
__________________
JG Marine Services Ltd Specialist Safety Boat Services

Bodfuan Shoot Ltd Traditional British Game Shooting
Jono Garton is offline   Reply With Quote
Old 03 June 2008, 07:44   #7
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
Mine is very heavy in the steering if the trim is wrong too
__________________
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 03 June 2008, 15:23   #8
Member
 
Country: UK - England
Town: gateshead
Boat name: rubber duck
Make: humber
Length: 5m +
Engine: mercury 115 opti 08
Join Date: Jun 2008
Posts: 40
hello Stephen L,does your boat ever lean to one side under power,i dont mean if you are heading towards say an object then when you add power you go offline,i mean one tube in the water and the other one towards the sky so the deck is on an angle as if there were half a dozen people sitting on one side of the boat?
__________________
montu is offline   Reply With Quote
Old 03 June 2008, 15:43   #9
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Doesn't every boats steering get heavy during trimming at different speeds? Just learn to use the right trim/speed for your RIB, Hydraulic steering helps during the heavy steering phase.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 03 June 2008, 15:43   #10
Member
 
Country: UK - Wales
Town: Milford Haven
Boat name: Various
Make: Commercial
Length: 10m +
Engine: Screw / Voith / Jets
Join Date: Sep 2002
Posts: 791
Send a message via MSN to Alex Brown
Hello,

I was just talking with Jono about this in the lock at Milford on Sunday afternoon!!

Trim the engine up pretty much as high as you can and you should find the "lean" will go - my Destroyer does this if the engine is any further down than the 3/4 trim position.

-Alex
__________________

__________________
Flickr Photos
Youtube Videos
Alex Brown 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 06:18.


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