flooding hull on searider - Page 2

shoestring · 29 July 2009, 22:05

I agree its really down to how you use your boat the most? I've tried mine open & closed and there's a BIG difference, especially if you're used to it blocked off. Basically if most of its 'playtime' with lots of stop starts and say pulling a donut etc. Leave it closed because the effort & delay in getting on the plane till it drains will definately get on your hooters! They become super stable as stated when stationary with the hull 'open' but unless you sit round in the boat for longer periods of time ie fishing, i'd say leave it closed? regards Alan

HUMBER P4VWL · 30 July 2009, 11:13

As searider stated, the avon kits for blocking it up are awful. The one at the back especially. Fine if using for the day, ie launching in and out, but we had ours on the mooring and with in a week, hull was flooded, permanent. Arse to sort out when on the water!!!

Ended up glassing it and putting a screw bung in for end of season.

Front plugs worked ok though, they were like a bottle stop with a quick release lever as found on bicycle wheels.

severncoxswain · 13 August 2009, 17:33

Block it! Better handling! Ive decided that! even though u have block'd it off already! Just thought I would say something

buzz989 · 17 August 2009, 13:00

I have read with interest every thread on blocking/leaving open the hull on my 5.4 searider with a Mariner 90hp 2 stroke and for my use I will stay with the blocked off theory.
However, has anyone considered cutting into the deck to make a bilge pump well? The reason I ask is that most new boats seem to have them. My hull does get some water into it after a day on the water - not a lot but enough for me to consider a well with a drain from the inner hull into the well that I could open as required.
Any thoughts would be appreciated.

doggypaddle · 17 August 2009, 13:06

Quote:

Originally Posted by buzz989

I have read with interest every thread on blocking/leaving open the hull on my 5.4 searider with a Mariner 90hp 2 stroke and for my use I will stay with the blocked off theory.
However, has anyone considered cutting into the deck to make a bilge pump well? The reason I ask is that most new boats seem to have them. My hull does get some water into it after a day on the water - not a lot but enough for me to consider a well with a drain from the inner hull into the well that I could open as required.
Any thoughts would be appreciated.

there appears to be some sort of well under the deck anyway at the stern on mine, its right at the back and central. if you put your arm up the bum hole and feel around there is a box about a foot of so by 4 inches deep. i dont know what the hell it is (volume reducer perhaps?) but i am sure that i have seen one (think it was chewys project) that had this opened up into a well for a bilge pump.
anyone know what it is for??

doggypaddle · 17 August 2009, 13:32

I asked Avon....its a volume reducer to keep all the weight of ballast midships as you get on the plane.
they said with the flooding hull blocked you could conceviably open it up into the deck to make a bilge pump well.
its full of foam aparently.

JSP · 17 August 2009, 13:34

Quote:

Originally Posted by doggypaddle

I asked Avon....its a volume reducer to keep all the weight of ballast midships as you get on the plane.
they said with the flooding hull blocked you could conceviably open it up into the deck to make a bilge pump well.
its full of foam aparently.

That's interesting to know!

HUMBER P4VWL · 17 August 2009, 16:12

Wish i had known that. Surely it is worth doing. With the low transom when fishing in a chop or with skiers getting in and out, the deck was always awash. A well at the back would have been invaluable for stopping bags/clothes etc getting wet with petrol mixed seawater before opening the trunk up!!!

That may be a problem though. The trunks are to the side and above any well/water line created. so unless you have a bilge pump in there/ move the elephant trunk location (difficult) you will just have a constantly full well??!!!

chewy · 17 August 2009, 21:56

Mines been left open and it handled fine.
Took about 10 seconds to drain the hull then it show off like a very scolded cat.

mdt · 17 August 2009, 22:18

Quote:

Originally Posted by doggypaddle

there appears to be some sort of well under the deck anyway at the stern on mine, its right at the back and central. if you put your arm up the bum hole and feel around there is a box about a foot of so by 4 inches deep. i dont know what the hell it is (volume reducer perhaps?) but i am sure that i have seen one (think it was chewys project) that had this opened up into a well for a bilge pump.
anyone know what it is for??

this box is a sealed box to provide some floatation other than the tubes. there is also one at the bow.

and yep if you cut into the rear deck to make a well will result in you hacking into this box.

JSP · 17 August 2009, 22:31

Quote:

Originally Posted by chewy

Mines been left open and it handled fine.
Took about 10 seconds to drain the hull then it show off like a very scolded cat.

The 5.4 takes allot longer (or so it seems to me) to empty compared the 4m I had.

chewy · 17 August 2009, 22:55

Quote:

Originally Posted by JSP

The 5.4 takes allot longer (or so it seems to me) to empty compared the 4m I had.

Probably cos the 5.4 is bigger.

JSP · 17 August 2009, 22:58

Yeah by 1.4m

What I'm getting at is you can't just zip up and off like you can in the 4m with the hull open. You have to build the speed up slowly.

GandyGoose · 18 August 2009, 08:24

I haven't helmed a Searider for ages, but I seem to remember the 4m that we used would take off with quite a "woosh" onto the plane. Back in those days Seariders were the only RIBs we had in service, and that sudden acceleration was recognised as a hazard, worthy of special briefing to people helming them for the first time.

Is this still a factor? I'm not sure how much that was due to the flooding hull emptying. It was explained as such, but of course we didn't have any non-flooding RIB to compare it with.

Tony S

chewy · 18 August 2009, 08:48

Quote:

Originally Posted by GandyGoose

I haven't helmed a Searider for ages, but I seem to remember the 4m that we used would take off with quite a "woosh" onto the plane. Back in those days Seariders were the only RIBs we had in service, and that sudden acceleration was recognised as a hazard, worthy of special briefing to people helming them for the first time.

Is this still a factor? I'm not sure how much that was due to the flooding hull emptying. It was explained as such, but of course we didn't have any non-flooding RIB to compare it with.

Tony S

It will be a hazard if your not aware, I nearly fell off the seat yesterdat.
If you give it a fist full of throttle it points skywards, the water drains then you shoot off. It was great fun but i just let it drain slowly until I found my feet!

walruz · 18 August 2009, 10:34

With the 17 inch standard Yam prop on my 5.4 takes off without any hesitation. With a 19 there is a slight hesitation but not very much. I have recently put my 50 ish litre tank in front of the consol which seems to have helped the balance as well. I will have to wait and see if there are any adverse effects in a large following sea.

With the 60hp I had on before it was a different story and very sluggish if you had more than 2 peeps on board.

I keep mine open BTW.

Ian

chewy · 18 August 2009, 11:19

I had 5 gallon in the bow but next time I would take 10 gallon, either a 2 5 gallon tanks or a tank and a 5 gallon water container.

mike-stgt · 01 September 2009, 17:19

Hi,

i closed my hull , when rebuilding the transom.
My engine is a elder premix Yamaha 75HP with trim.
2 20Liter tanks in the back. My ownbuild console , now in the middle.
Console weight approx 60kg.
Prop 13 1/2 x 17

Accelleration is outstanding.When changing from 3000 revs to full it is dangerous without the backrests.
As a leishure boat it is not usefull. It is very unstable while laying in water. I tried to fish in the Croatian Adria last week with my brother. Every move will change the hull from left tube to right tube and back. With my load, the tubes will only touch at the end the water.
I think about open it again.

Mike from south Germany

matt h · 01 September 2009, 17:22

Quote:

When changing from 3000 revs to full it is dangerous without the backrests

Blimey, what am i doing wrong??? i want more power egor!!

doggypaddle · 02 September 2009, 10:21

Quote:

Originally Posted by mike-stgt

Hi,

i closed my hull , when rebuilding the transom.

It is very unstable while laying in water.
Mike from south Germany

Unstable ????Bloody hell have you ever been in a hard boat the same size? if i stand on the gunwhale of my mates 17 foot mayland it leans over at about 40 degrees and everything slides over on the deck and makes it worse