Reply
 
Thread Tools Search this Thread
 
Old 07 March 2008, 02:21   #1
Member
 
Country: USA
Town: Los Angeles
Boat name: Napili
Make: Avon
Length: 4m +
Engine: Honda 50 o/b
Join Date: Jan 2008
Posts: 12
Avon Searider Water Ballast system

I recently acquired an Avon Searider 4.0. How does the water ballast system work? I see a threaded fitting in the lower section of the stern (transom.) Do I simply open that fitting and let the boat do the rest?
__________________

__________________
westlajay is offline   Reply With Quote
Old 07 March 2008, 04:26   #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
That doesn't sound right. Post a pic of the transom.
__________________
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 07 March 2008, 09:05   #3
Member
 
Country: UK - England
Town: Crawley
Boat name: Cossack
Make: Avon Searider
Length: 5m +
Engine: outboard 75 hp 2 str
MMSI: 235067342
Join Date: Sep 2007
Posts: 45
As just said that doesn't sound right.

The basic system is a large round hole 5 -6" at lower centre of transom plus a couple of small round holes 1" approx at the forrard end on either side of the hull adjacent to the stem. At rest the lower hull floods and makes it very stable but on the plane the water flushes out of the transom thus lightening the boat.

Sounds like someones modified your boat?
__________________
Sailmaker is offline   Reply With Quote
Old 07 March 2008, 15:27   #4
Member
 
Country: USA
Town: Los Angeles
Boat name: Napili
Make: Avon
Length: 4m +
Engine: Honda 50 o/b
Join Date: Jan 2008
Posts: 12
Transom Picture

Here is the shot of the transom in question.
Attached Thumbnails
Click image for larger version

Name:	stern.jpg
Views:	789
Size:	68.5 KB
ID:	33331  
__________________
westlajay is offline   Reply With Quote
Old 07 March 2008, 15:29   #5
Member
 
Country: Germany
Town: Stuttgart
Boat name: Boat
Make: Avon,Scorpio,535 She
Length: 5m +
Engine: Yam 75HP,Johnson 70
Join Date: Jan 2008
Posts: 133
Hi there.
the flooding hull works at lower speed and stop. In the front, just under the waterline , there is one hole of 1 inch in the hull. In the center of the transom,
just at the keel, there is a hole of 4 inches.
The hull has a seperate chamber inner the keel from front to back.
In stand, the water is flowing through the big hole in the back an gives a
plus of 700 pound water to stabilize the boat. In acceleration , the nose is comming up and the water is leaving in the back through the 4" hole and
breathing air in the 2 front holes. In decelleration the nose is commong down
and the front holes into water. So it is filling in decelleration.
I hope to have it declared to understand.
I have closed mine, because it needs a lot of power to come up from stand
to planning.

Salve Mike
__________________
mike-stgt is offline   Reply With Quote
Old 07 March 2008, 20:42   #6
Member
 
Country: Other
Town: Christiansted.V.I.
Boat name: Froggy
Make: Avon SeaRider
Length: 4m +
Engine: Johnson 50
Join Date: Oct 2006
Posts: 312
Photo

I looked at the photo and don't recognize what I'm looking at. The other posts relative to the water ballast system are accurate. Some like it, some don't but I can assure you that when laying to in a seaway, not corking all over the place is a real benefit. Landing a fish is sufficiently difficult into my 4.7 without bouncing around more than necessary. I don't really care that it takes extra effort and time to "get out of the hole".
__________________
Tomas is offline   Reply With Quote
Old 07 March 2008, 20:43   #7
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
Quote:
Originally Posted by westlajay View Post
Here is the shot of the transom in question.
Your flooding hull has been closed off. Do you still have the holes in the bow? If you do you need to block them too-and that small hole needs a screw in bung.
__________________
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 10 March 2008, 11:26   #8
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Quote:
Originally Posted by Nos4r2 View Post
Your flooding hull has been closed off. Do you still have the holes in the bow? If you do you need to block them too-and that small hole needs a screw in bung.
.....or get your holesaw out and reinstate the 4" hole at the transom!

I guess it depends what you want it for. The stability can be useful as Thomas says, but if you do a lot of stop - start then it can also be a pain in the bottom. Once the hull has emptied of the ballast water it behaves like any "sealed" hull. The only real difference is that it takes a bit longer to get up on the plane. Also with the ballast system it sits a bit lower at rest- good for rescue work (and I guess fishing?) as you're closer to the surface to pull people / tuna out. I had an SR4 with a 25 on the transom. Took about 20-30 seconds to drain & plane, but as it mostly was used for cruising it really wasn't a problem.

In short you either want a big hole at the back and the two small ones at the bow or none at all! Just remember that if you do reinstate the rear 4" hole to seal the perimiter properly or you'll get a floppy transom.
__________________

__________________
9D280 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 14:11.


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