Reply
 
Thread Tools Search this Thread
 
Old 28 June 2009, 17:52   #1
Member
 
Country: UK - England
Town: Hampshire
Length: 3m +
Join Date: Dec 2008
Posts: 118
Spray from outboard?

I'm using my zodiac 3.4 and Tohatsu 9.8hp weekly and love it. However I can't find the correct trim setting for the outboard. Every time I go on plane and open it up I get loads of engine spray over the transom so I have to back off? I've even fitted Doel Fins which didn't help. It's currently set for the 2nd lowest trim setting.
Any advise?
__________________

__________________
Flyguy is offline   Reply With Quote
Old 28 June 2009, 18:08   #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
Quote:
Originally Posted by Flyguy View Post
I'm using my zodiac 3.4 and Tohatsu 9.8hp weekly and love it. However I can't find the correct trim setting for the outboard. Every time I go on plane and open it up I get loads of engine spray over the transom so I have to back off? I've even fitted Doel Fins which didn't help. It's currently set for the 2nd lowest trim setting.
Any advise?
i use a long shaft on my 3.4 sib as i use the same engine on a heavy displacement fishing boat ,so i get a bit of spray when i use it on my sib ,but i put a shaped block of wood in the flat on the leg ,theres a photo of it on a couple of threads on here , held on with cable ties which sorts my spray problem ,how about a piece of thick rubber to go around the leg as a sheild to stop spray,i had doel fins on too which slowed me down ,most boats i have had seem to want the lowest trim setting .
__________________

__________________
m chappelow is offline   Reply With Quote
Old 28 June 2009, 18:19   #3
Member
 
Country: UK - England
Town: Hampshire
Length: 3m +
Join Date: Dec 2008
Posts: 118
That's a good. Can you please post a link to the pic so I get an idea of how you have done it.
Thanks again.
John
__________________
Flyguy is offline   Reply With Quote
Old 28 June 2009, 18:41   #4
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
Quote:
Originally Posted by Flyguy View Post
That's a good. Can you please post a link to the pic so I get an idea of how you have done it.
Thanks again.
John
couple of pics as requested ,
Attached Thumbnails
Click image for larger version

Name:	redcar 08 068.jpg
Views:	404
Size:	67.6 KB
ID:	43627   Click image for larger version

Name:	redcar 08 067.jpg
Views:	371
Size:	86.2 KB
ID:	43628   Click image for larger version

Name:	redcar 08 036dfdd.jpg
Views:	269
Size:	68.7 KB
ID:	43629  
__________________
m chappelow is offline   Reply With Quote
Old 28 June 2009, 18:58   #5
Member
 
Country: UK - England
Town: Warminster
Boat name: Narwhal
Make: Narwhal
Length: under 3m
Engine: Yamaha 8hp 2stroke
Join Date: Jun 2009
Posts: 8
Oooh, another long shaft engine user on a short shaft transom !

do you get any problems with the boat pitching up on full throttle ?, or any other problems other than spray with a long shaft engine ?

the reason i ask, is that i have bought myself a Avon Rover 3.1m airdeck SIB and i already had a Yamaha 8hp longshaft 2stroke engine left over from my big boat days many years ago

Do you think i should build up the transom to make the anti cav plate the same height as the bottom of the transom?, or should i stop fussing over it and just put it on and get boating ?, I intend to use in on estuaries and costal within a few hundred meters of the shoreline.

Just wondering what you think, as you run a long shaft engine on a short shaft transom

Thanks
__________________
Mosseriser is offline   Reply With Quote
Old 28 June 2009, 19:16   #6
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
to be quite honest i dont see much difference with using a short or a long shaft on this boat though it is heavy ,except might loose a bit of speed couple of knots or so ,it never cavitates or airates even in lumpy seas so i never loose power ,and i have never had any bother with it pitching up though its not exactly a big engine ,.only thing is if i need to clear the prop of weed its an extra 5 inches to stretch out ,.
__________________
m chappelow is offline   Reply With Quote
Old 29 June 2009, 07:59   #7
Member
 
Country: UK - England
Town: Hampshire
Length: 3m +
Join Date: Dec 2008
Posts: 118
Thanks for posting the pic. I will knck something up and let you know how I get on.
Cheers
John
__________________
Flyguy is offline   Reply With Quote
Old 29 June 2009, 16:47   #8
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
Flyguy - it might be worth searching for some threads by "Locozodiac" on here. He is a "SIB guy" based in S. America, who if I remember rightly had similar experiences. He got quite excited about two issues (1) making sure the boat is correctly inflated and (2) the engine height on the transom. I think he believed the latter was responsible for spray back over the transom.
__________________
Poly is offline   Reply With Quote
Old 29 June 2009, 18:41   #9
Member
 
Country: UK - England
Town: Hampshire
Length: 3m +
Join Date: Dec 2008
Posts: 118
Found it! Excellent, thanks Polwart. I'll try this first as it is an easy experiment.
Cheers
John
__________________
Flyguy is offline   Reply With Quote
Old 01 July 2009, 06:37   #10
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
just as a matter of intrest i was invited to a local sailing club last night to see how a s.i.b my sib would compare with there hard dory safety boats, and i borrowed a 15 hp 2stroke short shaft for the evening to use on my 3.4 sib ,guess what 2 crew and no difference to speed handling except we had a bit of airiation now and again ,but most noticable was the large amount of spray kicking up ,only good point was that with 5 adults on board went a bit faster than with my 8 hp 4stroke long shaft ,.
__________________

__________________
m chappelow 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 20:07.


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