Reply
 
Thread Tools Search this Thread
 
Old 15 April 2007, 05:27   #1
Member
 
Country: UK - England
Town: Liverpool
Make: Humber
Length: 5m +
Engine: Mariner 60 4/s
Join Date: Aug 2006
Posts: 18
weird turning.

HI,
we have a 5m humber assault with a 60 4/
When going fast on the plane, about 2/3 throttle and upwards it feels like our rib really dosn't want to turn, most ribs ive driven tend to bank over a little bit and lean into the corner making turning easier on the driver as your pushed into the seat.
On our rib it dosn't bank over at all when you turn, it feels bit like a go cart compared to a motorbike, a motorbike leans in, the gocart just turns, which is a little disconcerting as when you turn hard it feels like your going to be thrown of your seat sideways. /
thanks
__________________

__________________
Jack h is offline   Reply With Quote
Old 15 April 2007, 06:19   #2
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Humbers do tend to ride flattish but try trimming up a bit and see whether it helps.
__________________

__________________
JW.
jwalker is online now   Reply With Quote
Old 15 April 2007, 06:46   #3
Member
 
Country: UK - England
Town: Liverpool
Make: Humber
Length: 5m +
Engine: Mariner 60 4/s
Join Date: Aug 2006
Posts: 18
forgot to say, is there a solution to this? ^^^^^
__________________
Jack h is offline   Reply With Quote
Old 15 April 2007, 07:09   #4
Member
 
Country: UK - Scotland
Town: Inverness
Boat name: none
Make: none
Length: 5m +
Engine: none
MMSI: none
Join Date: Mar 2007
Posts: 1,908
Assaults do corner very flat in tight turns, they also tend to skip sideways in really tight high speed turns. Trimming up will just cause cavitation in these hulls.
Unfortunately this seems mainly to be down to the shallow V config so there is little to be done about it.
Trimming down before high speed turns will help cavitation but won't stop it completely.
This is one of the reasons why my next boat will be a deep V!
__________________
BruceB is offline   Reply With Quote
Old 15 April 2007, 12:10   #5
Member
 
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
MMSI: TBC
Join Date: Dec 2006
Posts: 4,013
Just been down in Cornwall for a week with a freind who has just bought a Humber (I think its the 5 meter one) It has mariner 90 on the back and certainly felt very unstable at high speeds. There was no way you could even think of trimming up without the boat feeling like it wanted to spin around the prop. Every time he went over about 27 knots you really had to watch it as it would start pitching left to right (chine walking) and if you did not cut the throttle it could get quite dangerous.

You could see when running along side of him that even at 25 knots only the back 2 foot of the boat was actually in the water.

Chris
__________________
Chris is offline   Reply With Quote
Old 15 April 2007, 14:05   #6
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by Chris1573 View Post
You could see when running along side of him that even at 25 knots only the back 2 foot of the boat was actually in the water.
Then he needs to learn how to adjust it and drive it.
__________________
JW.
jwalker is online now   Reply With Quote
Old 15 April 2007, 14:15   #7
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Sounds like he is learning. Just asking for other peoples experiences by the sound of it.
__________________
http://www.xfire.com/download/
Biggles is offline   Reply With Quote
Old 15 April 2007, 14:17   #8
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Biggles, you've maybe got Jack h and Chris's friend mixed up.
__________________
JW.
jwalker is online now   Reply With Quote
Old 15 April 2007, 14:18   #9
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by BruceB View Post
Trimming up will just cause cavitation in these hulls.
Then mount the motor a bit lower. Don't blame the boat.
__________________
JW.
jwalker is online now   Reply With Quote
Old 15 April 2007, 14:58   #10
Member
 
Country: UK - England
Town: Bristol
Make: Ribcraft
Length: 5m +
Engine: Yamaha
Join Date: May 2006
Posts: 4,194
same happened to mine, had a mariner 90 on a 5.3 ocean pro, and i could never trust it in a steep turn!! felt unweildy
__________________

__________________
matt h 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 19:11.


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