Reply
 
Thread Tools Search this Thread
 
Old 25 November 2008, 10:50   #11
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by Apherel View Post

Someone on here suggested using sand in old inner tubes tied off with cable ties.
They work very well as they tend to stay where they are put.

This boat has a 150 litre bow tank that can be filled with the correct amount of water and emptied on the run for perfect balance.
Attached Thumbnails
Click image for larger version

Name:	banana_shark_1 med edit S.jpg
Views:	144
Size:	42.4 KB
ID:	39010  
__________________

__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 25 November 2008, 14:14   #12
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Quote:
Originally Posted by Nasher View Post
Some of us in the solent have had access to the ultimate mobile flexible Ballast system which can be moved fore and aft at request.

Its called the:-

'Oi Hightower, run up to the Bow mate' system.

Nasher.
Yeh, Pete7 used to use that system on Old Spice. It's the only way we could get the thing to plane with 4 peeps on board
__________________

__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 25 November 2008, 14:25   #13
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
I've never needed to move ballast around on mine. If I'm traveling by myself then I can sometimes land Starboard (helm) side down, but I fitted her out to be a very neutral if a little bow heavy which becomes more balanced as the fuel level goes down.

I like the Idea of putting fuel tanks in the bow to level the ride, I'd hate to carry "dead" weight
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 26 November 2008, 08:12   #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: 4,611
My old SR4 had 2x 30L tanks - one at the bow & one at the stern - bow tank had a dedicated hose so I didn't need to manhandle them to swap tanks in a lumpy sea. Suz 25 (no PT) so I usually went for emptying the front tank first and the handling & speed improved slowly as the day ticked by.......
__________________
9D280 is offline   Reply With Quote
Old 28 November 2008, 04:44   #15
Member
 
Country: Australia
Town: Australia
Boat name: Independent (Indy)
Make: Avon SR6
Length: 6m +
Engine: Twin 90hp E-Tec 2016
Join Date: Oct 2007
Posts: 59
Weight in the Bow

Hi, my SR6 rides better with a bit of weight up the bow end. I have a bowsprit set-up and locker, however it tipped better with an extremely decent weight thick Tow Rope. I tucked it up the bow, with the expectation that I will never need but it is there if I do. Better than sitting in the shed doing nothing.

However, You may also want to consider the type of prop you are using as well. Different props will either lift or push your bow down, and assist in providing the range of useable tilt.

I always knew this to be the case, however, in recent prop testing (3 styles) I was amazed at the signicant variances the Props showed.

Good Luck
__________________
mr_sav is offline   Reply With Quote
Old 28 November 2008, 07:19   #16
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: 1,240
RIBase
Mr Sav

Interesting comment on the prop. I originally had a 17" * 13 dia prop and moved to a 19"* 13 and now have changed to a 21*13. I have yet to check out the new 21*13. But It may improve matters. The engine was overreving with the lower pitch props (approx 6400-6500 with the 19" and approx 7000 rpm with the 17")

Maybe the new prop will improve the handling of the DR490 in a head sea

TSM
__________________
two stroke mick is offline   Reply With Quote
Old 28 November 2008, 13:45   #17
Member
 
Country: Australia
Town: Australia
Boat name: Independent (Indy)
Make: Avon SR6
Length: 6m +
Engine: Twin 90hp E-Tec 2016
Join Date: Oct 2007
Posts: 59
Quote:
Originally Posted by two stroke mick View Post
Mr Sav

Interesting comment on the prop. I originally had a 17" * 13 dia prop and moved to a 19"* 13 and now have changed to a 21*13. I have yet to check out the new 21*13. But It may improve matters. The engine was overreving with the lower pitch props (approx 6400-6500 with the 19" and approx 7000 rpm with the 17")

Maybe the new prop will improve the handling of the DR490 in a head sea

TSM

I suspect the pitch change may not actually help that much with the bow. You could expect to come down a couple of hundred revs, however, It sounds to me you a prop that is not buest suited for your boat.

I just realised you are running an ETEC.

Are you running Vipers out of interest. They have quite a sweep on the blades, and causes bow lift. Go the SST (Traditional Props) and give them a go if your dealer is assisting you.

This is info from my Link the other week. It may be of interest or use to you. Note I am running twin Donks on an SR6, however, the principals are there.


http://rib.net/forum/showthread.php?t=27364

Regards.
__________________
mr_sav is offline   Reply With Quote
Old 30 November 2008, 11:07   #18
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: 1,240
RIBase
The props are just the standard ali types
__________________
two stroke mick is offline   Reply With Quote
Old 30 November 2008, 14:17   #19
Member
 
Country: Australia
Town: Australia
Boat name: Independent (Indy)
Make: Avon SR6
Length: 6m +
Engine: Twin 90hp E-Tec 2016
Join Date: Oct 2007
Posts: 59
Quote:
Originally Posted by two stroke mick View Post
The props are just the standard ali types

OK, I think you will find that is your problem. I don't know if this is a new motor or not, assuming you are trying different pitches is leaning me towards it may-be.

If the Ali's are standard with the 60hp range then it may be worth you seeing what an upgrade cost would be to the traditonal non-swept SST Blades.

You would not be disapointed.

I would recommend you try the 17" non swept SST Blade, and then determine whether you need to go up or down pitch to get the recommended Rev Range at WOT.

Best Of Luck.
__________________
mr_sav is offline   Reply With Quote
Old 02 December 2008, 13:39   #20
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: 1,240
RIBase
I have managed o get 2 10 lt fuel tanks these will fit into the bow locker of my Rib. I intend to plumb them up so that they can be connected to the engine with a snap type connection. Before this I used to have to pull in and top up of 4 no 5lt cans which is a pain in the ar**
__________________

__________________
two stroke mick 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 10:06.


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