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Old 26 October 2011, 08:57   #11
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Peter M,

My post was not very clear. My set up is that the deck drains into the bilges via a number of smallish drain holes and the large hole over the fuel tank sender under the stern bench seat. I think the big hole is there to allow access to the sender but as you would expect allows water to pour all over the electrical connections. The stern of my boat has a huge (1.5 metre) covered locker that contains a bilge well with a bilge pump. The trunk opens into this well as close to the bottom of the hull as possible but off to one side to give clearance for the motor.

I agree that this is not a great design and would prefer to have the deck drain bypassing the bilges completely. However it must be said (touch wood) that I have so far not had any cause to use the trunk apart from on dry land, or worry about the speed at which the deck drains, but there is always a first time... I should think about having some fitted as Boris is considering.
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Old 26 October 2011, 11:10   #12
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Originally Posted by Oscarguitar View Post
I do have a trunk but the biggest factor would be actually draining from the deck into the bilges so that they can be emptied by the trunk.
On my boat, the trunks drain the deck. The bilge is emptied by a 1000gph bilge pump. One of these days I'll add in a second backup pump, as I have experienced the pump screen clogging with debris.

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The trunk creates a big hole in the transom and my worry is that the trunk will tear without me knowing and fill the boat up with no way of easily stopping flow!
Just start moving forward. Doesn't take a whole lot of speed to get enough pressure difference to get water to leave. You do have to have a plan to get the boat out of the water, though. Nice thing about a RIB is that even if inundated, it's likely not going anywhere.

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Old 26 October 2011, 12:04   #13
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Ive seen ribs with failing pumps after a stuffing, with a boat half full of water, you loose a lot of steerage, and if you have to make a sudden turn you have literally tons of water sloshing over the deck this can make a bad moment really nasty.

Once you get any way on the bow will lift a little causing the water in the boat to move back, in addition you get a small void at the transom as the boat moves forward, these 2 things added together cause enough of a difference to drain very effectively.

in rough weather my trunk goes down till i get back to the harbour or get to slow speed.
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Old 26 October 2011, 18:31   #14
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On my Vipermax I had two drains installed. I've been out in some snotty weather, but I've never deployed them due to the fact I have only stuffed it once. I had a moment of madness and I was being a tit, I was more worried about the tooth that had gone though my lip and blood over the dash than water in the boat

But even then there wasn't much water on board and the deck pump coped with that.

But I would suggest at least one drain. Even if you never use it, there is always a chance that you'll take a big one over the bow and need to clear the water fast. I used my drain in the last RIB I owned that I used several times. You'll be surprised by how differently your RIB sits and handles in the water when up to the tubes in water.
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Old 27 October 2011, 03:20   #15
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I have two 3" trunks for the deck of my Parker, no deck pump. Plus an automagic rule pump in the bilge (and a bucket as 2nd line of defence for the bilge).
Key in safety critical systems is to have redundancy, and to not rely on active devices (ie switch, electrickily) as the fallback option.

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Old 27 October 2011, 04:03   #16
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Quote:
Originally Posted by Oscarguitar View Post
The trunk creates a big hole in the transom and my worry is that the trunk will tear without me knowing
My trunk was about to hit it's 25th birthday when it cracked slightly at the fold & started weeping- I've had more water coming in from between the toobs & the hull on other boats than that trunk leak!

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and fill the boat up with no way of easily stopping flow!
1) engage forward gear.
2) opren throttle.
3) job done!


Seriously tho' my old SR4 had no trunks, and the time it got swamped, it was a 10 minute slog with a bucket to get the water down to a level it would stand half a chance of getting on the plane to use the silly wee Searider "hole in the floor" drain. That swamping also managed to fill the main battery switch with salt water. 2 hrs later the Garmin 12 switched to it's internal battery, if that puts things in perspective.

Trunks are good.
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Old 27 October 2011, 04:28   #17
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I retro fitted my trunk to the Valiant DR 490. It is about 1 hrs work. Time well spent and very easy to do.
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Old 27 October 2011, 10:21   #18
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Used to run with both trunks down on my SR4, made cleaning the deck easy, hard astern then full ahead.
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Old 27 October 2011, 11:29   #19
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Plus an automagic rule pump in the bilge (and a bucket as 2nd line of defence for the bilge).
Can you get a bucket into the bilge to empty it?

Can't on mine (only access is through an 8" round hatch on the motor pod.)

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Old 27 October 2011, 15:43   #20
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Quote:
Originally Posted by jyasaki

Can you get a bucket into the bilge to empty it?

Can't on mine (only access is through an 8" round hatch on the motor pod.)

jky
yes
but a smallish bucket only, diameter abt 15-20cm
via the engine bay of the inboard

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