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Old 06-03-2019, 17:44   #1
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Intake strainer on cockpit drain thru-hull?

I am surveying all the thru-hulls on our new (to us) Hylas and noticed that there is a bronze intake strainer on the thru-hull for the port cockpit scupper drain. This particular thru-hull also has the backup bilge pump effluent tee'd into it. Has anyone seen something like this before? Is there some reason to have a strainer on an outlet that I am not considering?

In the attached image, it is the one on the right (aft). The one on the left is the generator intake.
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Old 06-03-2019, 17:52   #2
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Re: Intake strainer on cockpit drain thru-hull?

Uggg. Thatís an awful idea!
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Old 06-03-2019, 18:01   #3
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Re: Intake strainer on cockpit drain thru-hull?

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Uggg. Thatís an awful idea!
Couldn't agree more! Just wanted to see if there was some crazy reason for it to be there that I hadn't thought of before I remove it.
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Old 06-03-2019, 18:02   #4
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Re: Intake strainer on cockpit drain thru-hull?

Zebra mussels? I have nothing and also concur with Seamonkey (terrible idea!)
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Old 06-03-2019, 18:06   #5
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Re: Intake strainer on cockpit drain thru-hull?

That makes no sense at all. That’s a scoop strainer. Forward motion of the boat will bring water into the boat. Also boat builders put drain discharges above the waterline if possible. Are you sure that’s the pump and drain discharge?
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Old 06-03-2019, 18:14   #6
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Re: Intake strainer on cockpit drain thru-hull?

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That makes no sense at all. Thatís a scoop strainer. Forward motion of the boat will bring water into the boat. Also boat builders put drain discharges above the waterline if possible. Are you sure thatís the pump and drain discharge?
Yes. There is a scupper drain on either side of the keel in this location. I had to double-check it to make sure I wasn't seeing things when we hauled it out for winter. Admittedly I didn't really notice it during the short haul for the survey but when I started thinking about it... it made no sense. I'm not sure there should be one for the generator intake either.

Cockpit scuppers, head discharge, sink, and shower drains all drain below the waterline on all Hylas' I've ever seen.
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Old 06-03-2019, 22:42   #7
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Re: Intake strainer on cockpit drain thru-hull?

I’d remove the scoop strainer and make sure the thru-hull has a good seacock.
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Old 07-03-2019, 03:35   #8
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Intake strainer on cockpit drain thru-hull?

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That makes no sense at all. Thatís a scoop strainer. Forward motion of the boat will bring water into the boat.
I was thinking that too, especially for the generator, go for a good days sail, really be sailing well, and fill your generator with salt water via the exhaust.
If you want to keep them, at least turn them around, or replace them with round ones.

Being only in warm water mine you can remove the pin and open, but in truth itís kind of difficult to understand the purpose of an external strainer, when you have one inside of the boat that you can remove and clean.
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Old 07-03-2019, 04:44   #9
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Re: Intake strainer on cockpit drain thru-hull?

If the intake screen on the "scoop" is facing aft, the flow of water over the strainer as the yacht proceeds ahead will create a lower pressure zone over the aft angled screen face, and so, as on racing dinghy "self bailers", tend to suck water out of the drain. A perfectly sensible arrangement. If the down angle is facing forward, however...

FWIW...
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Old 07-03-2019, 04:46   #10
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Re: Intake strainer on cockpit drain thru-hull?

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If the intake screen on the "scoop" is facing aft, the flow of water over the strainer as the yacht proceeds ahead will create a lower pressure zone over the aft angled screen face, and so, as on racing dinghy "self bailers", tend to suck water out of the drain. A perfectly sensible arrangement. If the down angle is facing forward, however...

FWIW...


Although on a cockpit drain.....on our boat at least, the scoop would be filled with hair in short order.
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Old 07-03-2019, 05:05   #11
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Re: Intake strainer on cockpit drain thru-hull?

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Although on a cockpit drain.....on our boat at least, the scoop would be filled with hair in short order.
That is a possibility. However, where possible, the intake face of drains should be screened themselves to prevent debris entering the piping and potentially obstructing the drain, particularly where drain lines are curved or "routed". Of course, if one is not routinely aboard and doing maintenance, the drain intake screening itself can become problem-some if it becomes loaded up with debris. Too each, eh?
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Old 07-03-2019, 05:46   #12
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Re: Intake strainer on cockpit drain thru-hull?

We helped deliver a Hylas 56 recently and it had oversized cockpit drains in the aft end of the cockpit. In this boat, they had teed in an emergency bilge pump into one of these drains (well above the waterline) and this set up was deemed ok by offshore racing standards. There were no speed scoops on the hull for these thru hulls and they were further aft than the keel.

I'll agree with others the forward facing speed scoop on a cockpit drain makes no sense. My first question would be are you certain it's the cockpit drain and not the motor or other intake? Possibly pour water from cockpit through forward drain if its still up on the hard.

If it is in fact, the drain you don't need it and there should be plenty of draw on the drain tube with water flowing by it.

It maybe helpful to know which Hylas model you purchased. The intakes w/inside strainers on the 56 that were near the keel were for the motor, gen and AC. There were no forward drains in the cockpit.


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Old 07-03-2019, 07:05   #13
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Re: Intake strainer on cockpit drain thru-hull?

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We helped deliver a Hylas 56 recently and it had oversized cockpit drains in the aft end of the cockpit. In this boat, they had teed in an emergency bilge pump into one of these drains (well above the waterline) and this set up was deemed ok by offshore racing standards. There were no speed scoops on the hull for these thru hulls and they were further aft than the keel.

I'll agree with others the forward facing speed scoop on a cockpit drain makes no sense. My first question would be are you certain it's the cockpit drain and not the motor or other intake? Possibly pour water from cockpit through forward drain if its still up on the hard.

If it is in fact, the drain you don't need it and there should be plenty of draw on the drain tube with water flowing by it.

It maybe helpful to know which Hylas model you purchased. The intakes w/inside strainers on the 56 that were near the keel were for the motor, gen and AC. There were no forward drains in the cockpit.


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This is a Hylas 49 and I verified that it is indeed the cockpit drain. The arrangement is the similar as you described on the 54 with two large drains in the rear of the cockpit (might be a little more clear in this photo). On ours, we have the generator intake and cockpit/bilge drain to port, and the engine intake, cockpit drain, and sink drain to starboard. It is indeed odd. My plan now is to remove them and add a round opening strainer to the generator and engine intakes and remove both scoop strainers.
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Old 07-03-2019, 07:30   #14
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Re: Intake strainer on cockpit drain thru-hull?

Ok thanks for the extra info.

Is it possible they reversed the speed scoop on the drain when they did the last bottom job? Typically they have 4 screws and it could be reversed if not careful. The only reason to have it there (facing aft), would be to enhance a flow out and also possibly stop gurgling sounds (??). Again don't think you need any strainer for the drain.

For the gen. and motor, IMO the forward facing scoops are good and would leave those in place. Have seen on a few boats get a "hydrolock" and over heat the motor by not getting sufficient water flow when underway. This was corrected by simply putting the speed scoops on (like the ones you have).


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Old 07-03-2019, 09:17   #15
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Re: Intake strainer on cockpit drain thru-hull?

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That makes no sense at all. Thatís a scoop strainer. Forward motion of the boat will bring water into the boat. Also boat builders put drain discharges above the waterline if possible. Are you sure thatís the pump and drain discharge?

Running fast and heeled over on the low side, that setup could create a water feature in your cockpit and actually prevent water from leaving. Chisel it off and sleep better at night.
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