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Old 29 July 2012, 13:25   #11
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Quote:
Originally Posted by falcon0310 View Post
put non return valve in and you be fine
Why would I need one? The bilge outlet tube will have less than 40 cm of head height (Outlet at top of transom). Back flushing that little amount of water might help to keep the screen clear.

Never had check valves on my boats before, but have heard of failures when utilizing check valves. Seems much of it has to do with head height and drain back.
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Old 29 October 2012, 15:00   #12
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Here is the latest, although it has been tested with success now. Since I couldn't find hardly anything on the subject I will put this out there as a resource for others. I was worried about the Water Witch smacking the bottom of the floor, so I made it adjustable and mounted it to the center tube with Velcro. So far it is staying in place, and works just fine. Most of the time I just flip the pump to manual on right before putting it back on the trailer or for beach recovery.

The transom got routed out a little bit so the wires could pass thru without having to disconnect anything for floor removal.

Since the water has to exit the boat and I didn't need two of the lower scupper plugs I pulled one out, took it to Home Depot with a caliper in hand and within 2 minutes had a solution. Total cost less than $5. A reducer coupler, a bunch of elbows and back home I went to work on it. I already had the pipe and tubing. I just had to enlarge the scupper hole a little (Started with a power rasp, and switched to a hand rasp) to make room for the coupler which was glued in with 5200. The elbow and pipe didn't want to clear the floor so a little work with the heat gun shaped everything to fit together.



It is a very busy transom, but somehow there is room for everything. I tip the depth sounder up to clear the tie downs as seen. The aluminum bar in the middle is a transom saver I picked up from Craigslist for a smokin' deal, then modified it to work with my setup. The 8ft antenna is on the left, and the aluminum pole on the right is for my dive flag and eventually a 360 degree anchor light. It slides into a fishing pole mount that came with the boat, which makes taking the flag down easy. The blue deal is my 3" elephant trunk that mounts just above deck. Of course the launching wheel legs and brackets can be seen too.
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Old 29 October 2012, 16:38   #13
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bilge pump for sib

i have just got a seaflo 600gph cartridge airator bilge pump for my honwave, but am having problem geting it to prime up the long bottom intake ,has any one fitted one of the same and if so please give me some advice.
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Old 29 October 2012, 16:53   #14
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maxitope, I am assuming you mean an aerator pump that has the long threaded tube on the bottom? If so it will not prime unless the pump itself is submerged. I have two of those style pumps made by Attwood, and they require the impeller to have water flowing around it in order to start the flow. Once flowing they can produce a little bit of head lift, but that is not the right pump for the job. Aerator pumps are designed to be submerged like 95% of the bilge pumps on the market.

I looked into a vane type pump, that will suck water up from below, but they draw a lot of amperage, and are expensive.

So far the Whale Pump is working for me and it is a 500 gph. I couldn't find anything else that would fit under my decking.
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Old 29 October 2012, 17:42   #15
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hi peter c thanks for that ,just been on to firm i got it off and he is sending out a replacement as i thought it was faulty
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Old 29 October 2012, 17:59   #16
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Huh? Have you applied power to it and submersed it in a bucket? They are a very simple design and there isn't much to go wrong. If it makes noise it is probably working.

As I said, it is the wrong kind of pump for what you are trying to do.
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Old 29 October 2012, 18:44   #17
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Bilge pump is useless on a sib, you will need a battery too. Just trottle enough engine for sib to performa a wheely with water valve opened and you are done, probably will take it's time, can drink some cold beers while releasing water....

Happy Boating
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Old 29 October 2012, 18:55   #18
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just get a hand bilge pump and shove the hose under the floor .Strap it to the transom if you want it fixed in place
an electric pump in a sib is daft and a hand pump will pump faster than a small electric and be reliable
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Old 29 October 2012, 19:13   #19
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Before anyone asks why I would do such a stupid thing, the reason is because under the deck can hold 5 gallons of water that weighs over 40 lbs. When trying to drag it back up the beach to the trailer it is too heavy, so every pound lost is important. Look at my avatar for reference. The rear drains suck!
Y'all need to read my reasons before commenting that SIB's don't need pumps and a hand pump is good enough.

My boat has a very nice Hawker Odyssey PC925 AGM battery. Electrical power is not a problem. It also powers my VHF and more importantly my chartplotter/sounder/GPS for finding dive sites, along with providing electrical start for the engine. Next you are going to tell me I don't need a DSC equipped VHF radio, nor a depth finder

First of all I am mostly worried about beach landing and taking a wave over the stern (Been there, done that). There is no driving around and drinking a beer between scuba dives either.

Ian, if you believe a hand pump is more powerful than a 500 gph pump, I would inform you that you are gravely mistaken. I own a nice stainless steel shafted hand pump and it won't even come close to what the Whale Pump can continually kick out. In that same note my electric pump works completely automatically leaving me and my crew to recover the boat back onto the beach, while you are still pumping with your hand pump, as another wave breaks over the stern. A hand pump when you don't have hands available is daft

No wonder I never want to post up my lame work, as someone is always critical when they either couldn't do the work themselves, or think they have a better way.
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Old 29 October 2012, 19:47   #20
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try it peter you can shift about 50L a min with a pull up down simple hand pump , for a few gallons it is quicker . I think 500gph works out to 30L a min .

Anyway what i meant was not to split hairs with amounts and how fast you can pump but simplicity and reliablility of actually beaing able to pump when you need to.

I know what you mean by the wave over the stern if you get a surf landing a bit wrong with a slow crew . That wave usually brings with it a load of sand or pebbles and weed and an electric pump inacessible under the floor fails too easily . plus a wave in small rib has a battery under water and the fuel tank floating . plus that floor is giving the pump an extreme trampline ride .

I helped some guys last year on the beach after they moored their speedboat by the sternpost in small surf , it filled up and the pump lasted about 2 mins then it sank in 3 ft of water
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