Reply
 
Thread Tools Search this Thread
 
Old 29 March 2015, 04:26   #1
Member
 
Join Date: Mar 2015
Posts: 5
Mercury saildrive outboard

I resently bought a 4 hp saildrive motor for my sib as it was going cheap on the bay ive changed the high thrust prop for a normal one but it still seems very slow even for a 4hp are the gearbox on these set up lower ?
__________________

__________________
buttysugrue is offline   Reply With Quote
Old 29 March 2015, 04:53   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
What boat is it on?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 29 March 2015, 05:02   #3
Member
 
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 894
is it a long shaft, and the transom width measures up as suitable for a short shaft?
__________________
uncle al is offline   Reply With Quote
Old 29 March 2015, 05:26   #4
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
Saildrive engines almost always long shaft - or longer.
Bigger diameter prop - gear ratio might be different.

Not really the right engine for a SIB. ��
__________________
Searider is offline   Reply With Quote
Old 29 March 2015, 08:33   #5
Member
 
Join Date: Mar 2015
Posts: 5
Its on an avon r250 and yes it is a long shaft. 22" i think the transom is 16" i did know it was long for the size of boat but didnt think it would make that much difference thought the prop was more of an issue so changed that straight away do you think the added drag from longer shaft is likely to slow it down that much
__________________
buttysugrue is offline   Reply With Quote
Old 29 March 2015, 08:36   #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
That's presumably the problem. Long shaft outboards on short shaft transoms don't really work.
__________________
Cheers
Luke

Searider+Yamaha+Land Rover= :D :D
Mextli is offline   Reply With Quote
Old 29 March 2015, 12:08   #7
Member
 
Join Date: Mar 2015
Posts: 5
I shall assume so aswell then....... Anybody looking to buy a 4hp mercury saildrive
__________________
buttysugrue is offline   Reply With Quote
Old 06 April 2015, 14:17   #8
Member
 
Join Date: Mar 2015
Posts: 5
Gave the carbs a good clean out and put new plug in seems a lot better more what id expect from a 4 horse motor but a new problem seems to have arisen the longer shaft = more leverage seeing as its on a small SIB its lifting the front up to the sky I've had to weigh the front down to stop it flipping over made for an interesting trip today
__________________

__________________
buttysugrue 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 19:09.


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