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speaking of fouling.... speedos do suffer from it. I now have a paddle wheel type whoch replaced an impeller which was a mini propeller thingy. Both do get fouled but I think the paddle wheel is a worse design... as I cleaned it last week. The critters make a home inside the housing in addition to setting up shop on the paddle wheel itself. Impeller would get weeds and crusty, but did not have a colony or micro shrimp. Now I remove it when I am not aboard.
 

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I find I can get away with leaving the speed wheel in, until about mid July. Then the growth is too much, if it sits for more than a few days. I hate to remove and replace, as it lets several cups of seawater enter the bilge, which I then clean out.

Even when I've neglected it and the speed stops reading, I've never found the wheel won't turn. I'm not certain how they work, but I think they are magnetic, not mechanical and the sensor notices the cups go by. The critters or slight fouling seems to interfere with the sensor, more than interfere with the cups spinning. If I don't have time for it to dry out and fall off, I find myself digging in there with a toothpick.
 

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I find I can get away with leaving the speed wheel in, until about mid July. Then the growth is too much, if it sits for more than a few days. I hate to remove and replace, as it lets several cups of seawater enter the bilge, which I then clean out.

Even when I've neglected it and the speed stops reading, I've never found the wheel won't turn. I'm not certain how they work, but I think they are magnetic, not mechanical and the sensor notices the cups go by. The critters or slight fouling seems to interfere with the sensor, more than interfere with the cups spinning. If I don't have time for it to dry out and fall off, I find myself digging in there with a toothpick.
Airmar has a thru hull with a "valve/flap" which reduces the inflow to way less than a cup of seawater... so pulling and popping it in is not biggie.
 

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Airmar has a thru hull with a "valve/flap" which reduces the inflow to way less than a cup of seawater... so pulling and popping it in is not biggie.
Mine has the flap. They probably wear out or get fouled themselves. It’s not a gusher, but it is a few cups of water, as I said. Could also be a factor of only being able to reach one hand down to it. You can’t do a cups and balls two handed magic swap. You have to pull one out, drop it and pull your hand back to pick up the other and then reach back in to install.

The biggie for me is that the water takes off, under an inaccessible part of cabin sole, which is around the mast. I have to wait for it all to drain through a limber hole and then pick it up out of an accessible compartment. Just a PITA. I do it, but I do try to get away with not making the swap, as much as I can.
 

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It's a matter of technique..... have the plug ready.... unscrew the nut, pull the speedo with one hand.. and shove the plug in with the other.
 

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It's a matter of technique..... have the plug ready.... unscrew the nut, pull the speedo with one hand.. and shove the plug in with the other.
Re-read. You can’t fit both hands in the space, so you still need to extract one hand, before inserting the other. Its also off to the side, so it’s unbalanced. One of your hands is holding you up, while you reach. It’s a one hand job.
 

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Re-read. You can’t fit both hands in the space, so you still need to extract one hand, before inserting the other. Its also off to the side, so it’s unbalanced. One of your hands is holding you up, while you reach. It’s a one hand job.
I apologize as I didn't understand your situation. I moved the location of my speedo to CL forward of the keel where the most accurate reading can be taken... no keel effects. I also placed it under a section CL where I can get to it easily. This was considered in the placement. So I have two hands free and can kneel down and swap them lickity split.

You might consider a new convenient location for the speedo next time you haul.
 

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SO, thanks for the suggestion. Moving the speedo might make it easier. However, that’s quite an exercise to drill a new hole in the boat and patch the old one. The cure might be worse than the disease.
 

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SO, thanks for the suggestion. Moving the speedo might make it easier. However, that’s quite an exercise to drill a new hole in the boat and patch the old one. The cure might be worse than the disease.
Minnie... this is not a difficult project. 30 years ago I decided to added a back up system which had a tri-ducer. I drilled the hull on CL in the Ve berth.... Used it for a number of years and then it went south along with the company which made it.

So I removed it and filled the hole one spring. Again not a big project.

This Spring I decided to move by speedo which was next to the keel... and to get to it required removing all the gear stored under a settee. YUCK and a pain in the ass if underway and heeled. It was easy to reach once all the stuff was removed... then of course replaced. So I drilled out the plugged hole... the old and new were actually the same diameter so that worked out well. I have two transducers so I left the old one in the unused location... but with a plug in place.... and ran the new cable through the center of the bilge... again an easy task.

Now I lift up a small floor board for access. Easy peasy. The hardest part is getting up from kneeling on the sole!

This is better from many reasons... consider doing it at your next haul out.
 

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SO, thanks for the suggestion. Moving the speedo might make it easier. However, that’s quite an exercise to drill a new hole in the boat and patch the old one. The cure might be worse than the disease.
Minnie... this is not a difficult project. 30 years ago I decided to added a back up system which had a tri-ducer. I drilled the hull on CL in the Ve berth.... Used it for a number of years and then it went south along with the company which made it.

So I removed it and filled the hole one spring. Again not a big project.

This Spring I decided to move by speedo which was next to the keel... and to get to it required removing all the gear stored under a settee. YUCK and a pain in the ass if underway and heeled. It was easy to reach once all the stuff was removed... then of course replaced. So I drilled out the plugged hole... the old and new were actually the same diameter so that worked out well. A bit of a sloppy job routering out the liner to get to the hull. It's hidden by the holly and teak sole. My bad. I have two transducers so I left the old one in the unused location... but with a plug in place.... and ran the new cable through the center of the bilge... again an easy task.

Now I lift up a small floor board for access. Easy peasy. The hardest part is getting up from kneeling on the sole!

This is better from many reasons... consider doing it at your next haul out. You won't regret it.

Photo shows transducer before wire was run under the sole.
 

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