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Newbie questions on motors
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LOUIS B HOLUB
- Admiral
- Posts: 1315
- Joined: Wed Oct 19, 2005 7:40 am
- Location: 1999 Mac-X, Nissan 50 HP, Kemah, TX, "Holub Boat"
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Frank C
Vlad - w/t/hull, it was your topic to start with!
You can search on "wind instruments" (also try "ST60") to find earlier discussions. Rotating masts are industry-wide, so I think you can buy a compensating sensor - probably pretty expensive.
Almost nobody mounts a thru-hull 'ducer. You can buy a "shoot-thru" transducer that sends & receives right through the hull-bottom. It can be mounted as Louis described, or many other choices where hull is single layer. However, I moved my depth-finder from transom to an interior hull type and I don't like it because it frequently fails to provide a steady reading. The transom-mounted ducer always gave a steady, reliable reading.
And if you're thinking you can watch the depth decline to 3 feet before taking action, you're pushing your luck. You'll be reading depth trends, not absolutes. If you assume just 3 knots of speed & calculate the "warning time advantage" of moving the ducer fore or aft by 15 feet, you'll see it is less time than it takes to stop the boat!
You can search on "wind instruments" (also try "ST60") to find earlier discussions. Rotating masts are industry-wide, so I think you can buy a compensating sensor - probably pretty expensive.
Almost nobody mounts a thru-hull 'ducer. You can buy a "shoot-thru" transducer that sends & receives right through the hull-bottom. It can be mounted as Louis described, or many other choices where hull is single layer. However, I moved my depth-finder from transom to an interior hull type and I don't like it because it frequently fails to provide a steady reading. The transom-mounted ducer always gave a steady, reliable reading.
And if you're thinking you can watch the depth decline to 3 feet before taking action, you're pushing your luck. You'll be reading depth trends, not absolutes. If you assume just 3 knots of speed & calculate the "warning time advantage" of moving the ducer fore or aft by 15 feet, you'll see it is less time than it takes to stop the boat!
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Dimitri-2000X-Tampa
- Admiral
- Posts: 2043
- Joined: Fri Jan 02, 2004 5:36 am
- Sailboat: MacGregor 26X
- Location: Tampa, Florida 2000 Mercury BigFoot 50HP 4-Stroke on 26X hull# 3575.B000
I have a thru-hull transducer. It was already professionally installed before I bought the boat. It does not go through the ballast tank of my 26x. It is accessible through the port side aft berth panel in an area where the ballast tank is out of the way as a tube. I've never had any trouble with it. My former keelboat had a transducer plug that went into a thru-hull fitting (near the bow) so that it could be removed for cleaning (using temporary plug).