Reply
 
Thread Tools Search this Thread
 
Old 30 October 2012, 14:12   #1
AJ.
RIBnet supporter
 
AJ.'s Avatar
 
Country: UK - England
Town: Warwickshire
Boat name: Impulse
Make: Ribcraft
Length: 5m +
Engine: Suzuki 140
Join Date: Sep 2011
Posts: 1,020
Tohatsu 9.8 2 stroke long shaft

Hi all,

I have got my hands on a 2007 model, for use as an aux on the RC when I am not in convoy with other ribnetters.

But now I am thinking about using it on a SIB either as a tender when the RC is on a mooring or just blasting around along the shoreline, so I am looking for something small <3m.

My questions are:

How would the SIB get on with the long shaft?
Could I bolt on the transom a piece of marine ply to lift the engine up?
Any recommendations make model for a cheap (second hand 300) small SIB such as quicksilver 240 airdeck?

As always appreciate your advise

Alex
__________________
AJ. is offline   Reply With Quote
Old 30 October 2012, 18:07   #2
Member
 
m chappelow's Avatar
 
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
I use a long shaft on my sib ,

Down side is with the Tohasu they have a tendency to spray a bit of water up the leg & into the boat in most cases ,
I got around the spray thing by tie wrapping a shaped block of wood to the flat on the leg & made a couple of spray deflector/ shield that also cable tie on.
You could lift the engine up on a peice of wood but its not worth , unless you bolt a higher board on The transom .

You will loose a few knots top end speed & apart from having about 6 inches less drought/depth of water than a short shaft ,you will also have to lean 6 inches further out to clear the propeller if you get a plaggy bag caught up in it .

One big advantage is that if on lumpy sea ,as the the prop is that bit lower in the water it is less likely to airate, and you can keep the power on .
__________________

__________________
m chappelow is offline   Reply With Quote
Old 31 October 2012, 04:42   #3
Member
 
Country: UK - Wales
Town: abergele
Boat name: all mine
Make: ribtec 3m
Length: 3m +
Engine: tohatsu 9.8 hp 2st
Join Date: Sep 2012
Posts: 275
Hi I use a 6hp johnson (longshaft) and mercury 4.5hp (longshaft) I think a shortshaft would be better but money is a big factor, I dont know whether to sell both mine and get a 9.8 tohasu as they are easily converted to a 15hp
__________________
slate1234 is offline   Reply With Quote
Old 31 October 2012, 06:14   #4
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Quote:
Originally Posted by slate1234
I dont know whether to sell both mine and get a 9.8 tohasu as they are easily converted to a 15hp
How do you do that, then?
__________________
Downhilldai is offline   Reply With Quote
Old 31 October 2012, 06:31   #5
Member
 
Country: UK - Wales
Town: abergele
Boat name: all mine
Make: ribtec 3m
Length: 3m +
Engine: tohatsu 9.8 hp 2st
Join Date: Sep 2012
Posts: 275
do a search on iboats I belive its just the throttle cam you need to change
__________________
slate1234 is offline   Reply With Quote
Old 31 October 2012, 06:36   #6
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,924
RIBase
Slate1234 - you're thinking of the Tohatsu 9.9hp. DHD is a keen fisherman
__________________
willk is offline   Reply With Quote
Old 31 October 2012, 07:35   #7
Member
 
Country: UK - Wales
Town: abergele
Boat name: all mine
Make: ribtec 3m
Length: 3m +
Engine: tohatsu 9.8 hp 2st
Join Date: Sep 2012
Posts: 275
willk sorry you are correct it is the 9.9 and you may of just saved me buying a 9.8 cheers mate, the 6hp johnson i have has a restrictor plate on the inlet maifold and is the same as the 8hp but I'm not sure if I have to advance the timeing
__________________
slate1234 is offline   Reply With Quote
Old 31 October 2012, 07:50   #8
Member
 
Locozodiac's Avatar
 
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Tohatsu 9.8 and 9.9 are completely different animals, First is 170 CC and second is 250 CC. A 9.8 long shaft with a 240 mtr sib is a very bad combination. Too much tail and hull drag. After goofin around for a while will bore you soon, don't waste you money on small size sibs...

Better go a bit upwards, at least a 3 mt sib, can place a 5" engine mount or add same height wooden shim screwed to transom if wanting to use a long shaft engine. If Tohatsu is not correctly height seated on transom will have excessive splash issues...

Happy Boating
__________________
Locozodiac is offline   Reply With Quote
Old 31 October 2012, 10:27   #9
AJ.
RIBnet supporter
 
AJ.'s Avatar
 
Country: UK - England
Town: Warwickshire
Boat name: Impulse
Make: Ribcraft
Length: 5m +
Engine: Suzuki 140
Join Date: Sep 2011
Posts: 1,020
Really grateful for everyone taking the trouble to respond.

So to summarise so i have this clear in my head some people do use a longshaft on their SIB but this does result in lower top end and unwanted splash black due to the hight of the prop. Does the long shaft also affect handling/stability assume the SIB may wheelie greater with the longshaft. Once on the plane would there be any adverse handling apart from a load of water spraying over the transom?

With regards to using a <3m SIB I have read which surprised me (but I am a newbie) that the shorter the SIB can result in it taking longer to get on the plane? As I have a bigger boat I liked the idea of something small will the 9.8 have problems getting a <3m on the plane with 1 or 2 people? 24stone combined and yes I am carrying a bit of timber at the moment!

Again responses greatly received
__________________
AJ. is offline   Reply With Quote
Old 31 October 2012, 19:32   #10
AJ.
RIBnet supporter
 
AJ.'s Avatar
 
Country: UK - England
Town: Warwickshire
Boat name: Impulse
Make: Ribcraft
Length: 5m +
Engine: Suzuki 140
Join Date: Sep 2011
Posts: 1,020
Quote:
Originally Posted by AJ. View Post
Really grateful for everyone taking the trouble to respond.

So to summarise so i have this clear in my head some people do use a longshaft on their SIB but this does result in lower top end and unwanted splash black due to the hight of the prop. Does the long shaft also affect handling/stability assume the SIB may wheelie greater with the longshaft. Once on the plane would there be any adverse handling apart from a load of water spraying over the transom?

With regards to using a <3m SIB I have read which surprised me (but I am a newbie) that the shorter the SIB can result in it taking longer to get on the plane? As I have a bigger boat I liked the idea of something small will the 9.8 have problems getting a <3m on the plane with 1 or 2 people? 24stone combined and yes I am carrying a bit of timber at the moment!

Again responses greatly received
Anyone out there?
__________________
AJ. 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 16:58.


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