Reply
 
Thread Tools Search this Thread
 
Old 30 December 2016, 11:57   #1
Member
 
Mextli's Avatar
 
Country: Germany
Town: Nuremberg
Boat name: November
Make: Avon Searider 4M
Length: 4m +
Engine: Yam 55
MMSI: 211748930
Join Date: Aug 2012
Posts: 312
RIBase
Trim Tabs on Avon Searider 4M

Hi all

Has anyone ever mounted "proper" adjustable trim tabs on a 4m Searider? Not talking about the automatic ones but the electrical ones.

Id love to be able to push the bow deeper into the waves in head seas, and Im afraid my weight distribution is slightly off to the rear.
__________________
Cheers
Luke

Searider+Yamaha+Land Rover= :D :D
Mextli is offline   Reply With Quote
Old 30 December 2016, 15:56   #2
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,544
RIBase
Try putting a 25kg bag of sand in the anchor locker
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave is offline   Reply With Quote
Old 30 December 2016, 16:29   #3
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,537
Don't forget your inducing drag with the tabs, what in terms of weight is making it sit stern down if that's your boat in the picture driving position well forward I guess fuel under the seat so engine trim should sort a level plane. You need the bow to climb the wave or you risk stuffing and losing speed/ momentum or sudden stop if bow heavy. Some boat builders put ceramic balls in resin at the keel in the anchor locker but it has to be worked out properly,personnely I would sooner move kit forward to achieve balance OMO
__________________
jeffstevens763@g is offline   Reply With Quote
Old 31 December 2016, 04:03   #4
Member
 
Mextli's Avatar
 
Country: Germany
Town: Nuremberg
Boat name: November
Make: Avon Searider 4M
Length: 4m +
Engine: Yam 55
MMSI: 211748930
Join Date: Aug 2012
Posts: 312
RIBase
I have a 40l fuel tank at the transom, thats my problem, and usually some kit behind the console as well.

Here is a picture



Concerning drag and stuffing issues, shouldnt it be possible to fully retract the tabs?
__________________
Cheers
Luke

Searider+Yamaha+Land Rover= :D :D
Mextli is offline   Reply With Quote
Old 31 December 2016, 05:54   #5
Member
 
Country: UK - Scotland
Town: denny
Boat name: breezy
Make: humber
Length: 5m +
Engine: mariner 115
MMSI: 235913962
Join Date: May 2016
Posts: 534
RIBase
move the tank towards the front ?
__________________
breezeblock is offline   Reply With Quote
Old 31 December 2016, 06:06   #6
Member
 
Mextli's Avatar
 
Country: Germany
Town: Nuremberg
Boat name: November
Make: Avon Searider 4M
Length: 4m +
Engine: Yam 55
MMSI: 211748930
Join Date: Aug 2012
Posts: 312
RIBase
Tank wont fit in front of the console, its too fat :/ been thinking about two 25l tanks but that would neccesitate a lot of pipework (which is quite short now) and the fuel gauge would not fit as well as they would be harder to tie down securely.
My console is very far foreward as I need the deck space.

Power Trim would propably solve all my issues. I can trim the bow down by manually trimming the engine but this makes it very prone to stuffing in following seas. Just for tackling on head seas this would suffice, but you can hardly stop every now and then and retrim your engine manually, as the trim thing is below the waterline and very awkward to reach and adjust.

I have been looking for used power trim units for my Yam but unfortunately they seem quite rare.

Trim tabs wouldnt be as practical, but the seem cheaper (most PTT units i
found are either in the states or above 600 quid or both.)
__________________
Cheers
Luke

Searider+Yamaha+Land Rover= :D :D
Mextli is offline   Reply With Quote
Old 31 December 2016, 06:08   #7
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,905
RIBase
Quote:
Originally Posted by Mextli View Post
Concerning drag and stuffing issues, shouldnt it be possible to fully retract the tabs?
Tabs are approximately in line with the hull in the "fully retracted" position, so there will still be some (very little) drag. IMO putting fully controllable tabs on a SR4 is overthinking a problem - moving a little weight around will do the same job. With your helm so far forward even the extra pies you ate over Christmas may do the trick!
__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 31 December 2016, 06:10   #8
Member
 
Mextli's Avatar
 
Country: Germany
Town: Nuremberg
Boat name: November
Make: Avon Searider 4M
Length: 4m +
Engine: Yam 55
MMSI: 211748930
Join Date: Aug 2012
Posts: 312
RIBase
Quote:
Originally Posted by willk View Post
Tabs are approximately in line with the hull in the "fully retracted" position, so there will still be some (very little) drag. IMO putting fully controllable tabs on a SR4 is overthinking a problem - moving a little weight around will do the same job. With your helm so far forward even the extra pies you ate over Christmas may do the trick!
Hopefully.

Overthithinking the problem sounds nice though.
__________________
Cheers
Luke

Searider+Yamaha+Land Rover= :D :D
Mextli is offline   Reply With Quote
Old 31 December 2016, 06:20   #9
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,544
RIBase
I hadn't realised that your engine wasn't PTT, therein lies the problem. There's no reason why you couldn't add trim tabs, but this isn't resolving the underlying cause of your problem.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave is offline   Reply With Quote
Old 31 December 2016, 06:33   #10
Member
 
Mextli's Avatar
 
Country: Germany
Town: Nuremberg
Boat name: November
Make: Avon Searider 4M
Length: 4m +
Engine: Yam 55
MMSI: 211748930
Join Date: Aug 2012
Posts: 312
RIBase
Finding light 50 HP engines with PTT that arent too costly is unfortunately rather hard

PTT would definitly improve the trim issues.
__________________
Cheers
Luke

Searider+Yamaha+Land Rover= :D :D
Mextli is offline   Reply With Quote
Reply

Tags
avon

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 19:44.


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