Reply
 
Thread Tools Search this Thread
 
Old 22 December 2002, 17:00   #1
Member
 
Country: Ireland
Town: Dublin.
Boat name: Tender 2.
Make: Valiant DR 600
Length: 6m +
Engine: 150 Optimax
MMSI: coming soon !
Join Date: Oct 2002
Posts: 443
Water at transom ?

Guy's, a little information needed please. I took out the rib today for a blast. The sea was quiet ( small swell) and stuff all wind. At around 3/4 throttle my rear passengers were getting a large amount of water sprayed up on them from the transom area. It was coming up between the transom and the engine like a shower. I slowed down and it made it better. Further on we had no swell at all and no spray at full speed. I had changed the trim very slightly and moved one of the kids forward to the bow. Any advice please..... two soaked and pissed off kids want to know if this happens all the time.
__________________

__________________
Scotty is offline   Reply With Quote
Old 22 December 2002, 17:30   #2
DJL
Member
 
Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
Join Date: Apr 2002
Posts: 929
Scotty,

I think this is due to the height of the engine on the transom.

My boat is suffering the same problem after I got my new engine. The engineers said that raising the engine would help, however they were a little worried that raising the engine and installing a higher pitched prop (engine is over revving at the moment) would increases my speed too much.

I'm going to give steel developments a call soon and see what they recommend.

Daniel
__________________

__________________
DJL is offline   Reply With Quote
Old 22 December 2002, 17:46   #3
Member
 
Country: Ireland
Town: Dublin.
Boat name: Tender 2.
Make: Valiant DR 600
Length: 6m +
Engine: 150 Optimax
MMSI: coming soon !
Join Date: Oct 2002
Posts: 443
Quote:
Originally posted by DJL
Scotty,

I think this is due to the height of the engine on the transom.

My boat is suffering the same problem after I got my new engine. The engineers said that raising the engine would help,
Daniel
My thoughts as well but the engine has been on the boat for a year and the previous owner seemed to know a lot about powerboats. And the problem was gone later in the following sea.
__________________
Scotty is offline   Reply With Quote
Old 22 December 2002, 17:55   #4
DJL
Member
 
Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
Join Date: Apr 2002
Posts: 929
I only notice it when the sea is flat and you get a calm, interupted flow of water under the stern of the boat.

You can quickly rule out height problems but checking with a ruler but personnally if this is the first time you have noticed it I wouldn't worry too much about it.
__________________
DJL is offline   Reply With Quote
Old 22 December 2002, 17:56   #5
Member
 
Pete7's Avatar
 
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,850
Try trimming the engine a bit first to see if a minor adjustment can solve it. Otherwise yep its the height that need changing.

As a start point the anti cavitation plate on the engine should be 1 inch above the bottom of the transom. If that works and everything is fine then it can be raised again, one hole at a time. However on a rib raising it to high will result in the prop ventilating in turns as the tubes can't be pressed down into the water they lift the stern enough for the prop to pull down air from the surface. This can be reduced by trimming the outboard in a little for sharp turns. Changing the engine height is quite straight forward on an outboard, just need a couple of friends and some spanners, takes about half an hour. Use a block of wood under the engine fin and the trailer jockey wheel to raise and lower the back of the boat as required.
__________________
Pete7 is offline   Reply With Quote
Old 23 December 2002, 06:14   #6
Member
 
Country: Greece
Town: Gloucetsreshire
Boat name: GATO DI MARE
Make: MAR.CO
Length: 9m +
Engine: Yamaha 200Vmax
MMSI: 235027678
Join Date: Sep 2002
Posts: 3,339
Send a message via MSN to Manos Send a message via Yahoo to Manos Send a message via Skype™ to Manos
Scotty

The RIB you talking about is the new Zodiac you've got I believe.
If it is, try to lower the engine down a wee bit (not trim it down). Most likely is that your engine is mounted too high on the transom.
As (if I remember rightly) you bought it 2nd hand possibly the previous owners wanted some more speed at the top end and the engine was mounted at a higher level than it should for a 'family friendly' run.
In any case the Zodiac importer in Greece is a friend of mine and will ask the question to him after the hols and let you know if you still haven't cured the problem.

Manos is offline   Reply With Quote
Old 29 March 2004, 10:15   #7
Member
 
Country: UK
Make: Ribcraft
Length: 4.8m
Engine: Mercury F60 EFI
Join Date: Dec 2003
Posts: 89
Sorry to dig this thread up again, but I had the same problem this weekend on my new 4.8

Scotty, did raising the engine solve the problem?
Thanks,

Robert
__________________
Robert1 is offline   Reply With Quote
Old 30 March 2004, 12:02   #8
Member
 
Country: Ireland
Town: Dublin.
Boat name: Tender 2.
Make: Valiant DR 600
Length: 6m +
Engine: 150 Optimax
MMSI: coming soon !
Join Date: Oct 2002
Posts: 443
Quote:
Originally posted by Robert1
Sorry to dig this thread up again, but I had the same problem this weekend on my new 4.8

Scotty, did raising the engine solve the problem?
Thanks,

Robert
Rob,
I forgot I posted this and thought someone else was using my name The problem is there some times but only at full speed ! The boat goes back into the water this week after a long wintr and I will tell you then.

Regards,

Luke.
__________________

__________________
Fast... Very feckin fast please.
Scotty 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 01:38.


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