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Old 28-09-2018, 14:16   #1
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Speed sensor question - pulling out

My Columbia 8.7 has an Airmar St200/550 sensor, it's document say it should be pulled when boat sits.

I have the plug for it, but I am concerned about pulling the sensor and inserting the plus while boat is in water. Is this just a simple pop the sensor out and push the plug in while bay tries to come inside?

I know this a dumb question, but I am chicken to find out the hard way
Thanks
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Old 28-09-2018, 14:34   #2
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Re: Speed sensor question - pulling out

Yes just pull and plug. Take your time so you donít cross thread. Not much bay will come in.
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Old 28-09-2018, 14:36   #3
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Re: Speed sensor question - pulling out

Eventually you'll have to learn to do it, if/when your paddlewheel gets fouled. I found that learning which of your hands is better at removing the one and slapping the plug in is very important.



From my 2015 Mainesheet article on replacing some of the BNC cabling:


I have gotten quite good at this and my trick is this: Being right handed my first thought was to remove the transducer with my right hand and install the plug with my left, but I found out that doing it just the other way worked much better, since I could insert the plug more quickly and cleanly with my right hand, greatly reducing the intrusion of water from that big hole.



Good luck. Like docking, practice helps. The first time is always a hassle. Towels!
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Old 28-09-2018, 16:04   #4
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Re: Speed sensor question - pulling out

It wonít let in near as much water as you think, but be careful not to cross thread when getting the plug back in. Once you push in the plug, not much water comes in and even with the plug out, there is not that much. Just get a few paper towels to sop up the water.
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Old 28-09-2018, 16:55   #5
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Re: Speed sensor question - pulling out

I learned the trick is to do it in a very relaxed manner. No need to hurry. The amount of water we get in is never more than half a bucket.


b.
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Old 28-09-2018, 19:50   #6
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Re: Speed sensor question - pulling out

Quote:
Originally Posted by barnakiel View Post
I learned the trick is to do it in a very relaxed manner. No need to hurry. The amount of water we get in is never more than half a bucket.


b.


Thanks all, will report back
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Old 29-09-2018, 09:27   #7
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Re: Speed sensor question - pulling out

I agree, this is an operation that makes me very nervous too.
The trick, as others have said, is to be relaxed and keep calm as you see some water (indeed, not a lot) come in. Easier said that done... The good thing is that even if you fumble it a bit, as I do, the water is never so much.
I guess, like everything else, it improves with practice...
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Old 29-09-2018, 09:28   #8
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Re: Speed sensor question - pulling out

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Originally Posted by Wavehiker View Post
Yes just pull and plug. Take your time so you don’t cross thread. Not much bay will come in.
I am right handed like most.
First I pull the sensor out with my right hand and the second it is out I close the throughull with my left palm.
Then at my leisure I take the dumb plug in my right hand, bring it close, lift left hand and insert the plug.
In my experience, it is the most efficient (and safe) way even though the throughhull is open twice.
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Old 29-09-2018, 10:17   #9
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Re: Speed sensor question - pulling out

Unreal! Does such a manini little everyday procedure present a real-world dilemma for very many sailors?

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Old 29-09-2018, 11:00   #10
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Re: Speed sensor question - pulling out

I just did this for the first time last season, everything I read about it said"not much water comes in". Then I tried it and it was like a fire hose! Not sure how much water actually comes in, but it sure gave me some serious pucker! In the end it's all good, no biggie.
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Old 29-09-2018, 11:29   #11
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Re: Speed sensor question - pulling out

some speed sensor thru hulls have a flap that closes when you pull the paddle wheel out and not much water flows in, some do not have this and a big stream gushes up, can be quite exciting at first, no big deal once you do it a few times.
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Old 29-09-2018, 11:29   #12
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Re: Speed sensor question - pulling out

I like a dry bilge. I gave up on those things a decade ago. Just cdon't need it.
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Old 29-09-2018, 11:32   #13
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Re: Speed sensor question - pulling out

with no speed sensor how do you figure how much current you are dealing with?
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Old 29-09-2018, 12:19   #14
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Re: Speed sensor question - pulling out

Iíve done it a thousand times and I still feel a twinge of anxiety when I do it. Like some little corner of my brain thinks itís a bad idea.
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Old 29-09-2018, 13:15   #15
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Re: Speed sensor question - pulling out

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Iíve done it a thousand times and I still feel a twinge of anxiety when I do it. Like some little corner of my brain thinks itís a bad idea.
Yes I find it scary. I put a little Vaseline on the o rings before inserting - helps it to slide in easier.

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