log impellor didn't sink boat

[R32Stbrigid]

ST50 Paddle wheel

Although I always remove the paddlewheel after a weekends sailing I also treat it with dry film ptfe. This works as a great antifouling for when it is immersed ....

 

[Cantata]

we have an st60 and I always remove the paddlewheel and replace it with the blank plug at the end of the weekend - be interested to know if others don't and have no problems with it fouling up as if so might try leaving ours in - it is not antifouled at all .

I'm in a mud berth and always leave the paddlewheel in. Occasionally it might be stuck for the first 100 yards or so each trip but it soon frees itself.
Maybe gets jammed good and proper once a season needing removal and cleaning. Would never consider removing it after each trip - unnecessary and bad for my nerves.

 

[FrancisRutter]

Francis Rutter.

I got an ST 60 when I replaced my log because of the flaps to seal the hole when changing from impellor to blank. Sadly, either it hasn't got the flaps or else they have never deployed. Doesn't really matter when at rest, but if I forget to change over before leaving mooring and try to do it while under way then the flood is considerable.

 

[ghostlymoron]

On my old boat I had a NASA clipper transducer which I always removed when not sailing. We are on a drying mooring so no problem. The NASA was very prone to sticking and I did everything I could to keep it going. New boat has an ST60 which is more robust so I am not so fastidious removing it.

 

[BrianH]

It's a bit of a pain but as relatively inexperienced sailors we value knowing our speed through the water (as opposed to the SOG from the chart plotter) so we can understand the effect (or not!) of our sail trimming

Only in very dynamic and varying streams would SOG be unreliable to note performance changes from sail trimming, I would have thought. Perhaps river racing is a case in point.

 

[chockswahay]

My boat had a B&G paddle wheel......................undo cover...........remove.............place palm over gushing torrent of water................hold palm in place.................clean paddle one handed................reverse the sequence...............easy!!!!

Oh, did I forget to say that I ALWAYS got a bloody good soaking? And did I forget to say that no matter how many times I did, it was always a nervous moment?

Holes in boats! don't ya just love em??!!

Chox

 

[ColinR]

I have a nasa log, none of this flap malarkey, though I have often read with envy from those that do have flaps and other contraptions to aid the removal of the log. What I don't understand in your story above, could you not use the palm of your hand to stop the water? This is what I do if I am just whipping it out for a second and clearing a bit of weed or scraping a barnacle off the blade, you can do this with one hand or better still let your crew get the barnacle smell under her finger nails!

For longer removal it really is not so difficult to fit the blanking cap, in reality little water is really allowed into the boat.. I guess it depends where your log is located. Your tale has made me realise that there is no perfect solution, so thank you for that!

the palm of my hand was my immediate response, but hardly a long term solution! I had to clear the obstruction in order to insert the plug or to put the paddle wheel back in and you know what happened the second I took my palm away to start poking around to see what was was causing the problem. Luckily the flap came away after a bit of fiddling. I do have wooden bungs of course but I wouldn't like to leave it with a wooden bung rammed into a plastic tube. As someone else mentioned it would swell and split the plastic. Raymarine have put me onto the impeller tube manufacturer who do a bronze version which is what I'm going to fit next time I dry out. I think these flimsy plastic ones area liability as the integrity of the hull relies on it.

 

[pcatterall]

I used the ball of my big toe, good size and the hands are free to clean the transducer!!

 

[Bosun Higgs]

I'm glad its gone and bless the day that GPS started giving me an accurate speed down to one decimal place, something that my primitive technology, moving parts knotmeter never accurately managed.

Are you sure? I have a Nasa repeater taking a feed from the Raymarine instrument system, yet the two never show the same SOG number.

 

[tt65]

How much water?

I have had a Nasa Clipper log for years. I leave it in place normally but take it out to clean if readings become inaccurate or stop. Normally I sponge up 1.5 saucepan full of water, it might even be 1.75 saucepans if I am a bit slow. I use the regular blanking cover, so I can clean the paddlewheel without a rush. Whole thing rarely takes more than 5 minutes, but pleased when it is over and no threads got crossed.

I am always startled at the sight of daylight through the hole when the impeller first comes out and before I close it up. Dont know why.

I wish the Clipper Wind masthead unit was as simple when it goes wrong.

Couldn't be doing without water speed as well as ground speed.

 

[BrianH]

Are you sure? I have a Nasa repeater taking a feed from the Raymarine instrument system, yet the two never show the same SOG number.

Well, at least one must be wrong

Perhaps I'm missing something but infer from your text that you have just one set of GPS coordinates that are being displayed differently at the original instrument to the remote display. If that is so then a problem surely lies in your cabling or the signal handling/display by the repeater. In which case the Raymarine would be supplying the original and correct value and a corrupted one is displayed from the Nasa downstream from it.

I prefer a single (kiss principle) integrated antenna plotter in the pilothouse, which has never induced me to distrust the data.

One of my regular applications of invaluable assistance of SOG is when taking up a buoy singlehanded - my usual state of affairs. Approaching the buoy from downwind - or if tidal stream is greater, downstream - I can line it up and, even when it has disappeared from view under the bow, adjust my speed down to 0.1 knots, then to zero, knowing that I really am stationary and can stroll out of the pilothouse with the boathook and retrieve it. Well, it works for me.

 

[mikehibb]

When we took possession of our new to us boat, we were aware that the log was not working, guessed it was just fouled up. ( We were correct)

However the last thing I wanted to do was open a hole in the bottom just days after finaly managing to buy something designed to keep the water out.
So carefully tried to undo to "hand tight only" cap. Nahh.
Luckily we had an oil filter strap, so with some very gentle pressure it released.
I am ready, buckets, sponges, bungs of every size etc. out it pops a cup full of water and then the little flappy things snap shut.

We also found an old log in the tool bag that was obviously defunked, but now acts as a great blank plug.

Must admit that I was slightly worried first time I changed it though. I still have a correct sized wooden bung to hand though, just in case.

 

[matt1]

I had exactly the same problem with my ST60. In the end the only option was to force the airmar supplied plug in with some force. This then ended up pushing the flap out the transducer but at least water wasnt coming in

Mine just had a single flap. Very easy to replace (when dried out!!) and not especially expensive (a tenner from HME). I didnt think the flap made much difference to the inflow of water......until it broke!!

 

[mattnj]

the raymarine manual tells you to antifoul the paddle assembly carefully, you can leave it in for much longer if you do, still needs cleaning every now and again of course, without antifoul ours needed doing everyweekend