Marine Electronics Forum

transducer...speed limits?

Old 09-29-2008, 02:53 PM
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Default transducer...speed limits?

I have an Airmar B164 transducer just installed. Shouldn't this thing read depth at 50 mph? I took the boat out yesterday and just could not get a read at anything over 40mph.
elwopo is offline  
Old 09-30-2008, 12:10 AM
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Default Re: transducer...speed limits?

Well your getting air under the hull at 50MPH. Do you normally run that fast all the time?

Slow down. See the bottom and save gas.
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Old 09-30-2008, 04:58 AM
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Default Re: transducer...speed limits?

every boat is different, and every sounder-ducer pairing is different too. I was just on a new 38 fountain that used the 500w tilted (B60) with a garmin gsd22/5212 and it read to a little over 46, which was a bit higher than I thought it would go, on that boat a B164 might have cracked 50. There is no hard and fast number you can always expect before hitting the water.
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Old 09-30-2008, 05:03 AM
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Default Re: transducer...speed limits?

Does it matter if it can see the bottom at 50 mph? Its not like you can stop in time if you see something on the screen.
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Old 09-30-2008, 05:06 AM
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Default Re: transducer...speed limits?

Unless you got a way to keep the transducer fully in the water and not getting aeration, it will never read at 50+ mph, because at that speed even over tiny wavelets, the hull is never sitting in the water 100% of the time. As a general rule, the bigger the boat (assuming a perfectly placed transducer (far aft and at the keel), the faster speed it will read at. If you get 40 mph in a 25' boat that is pretty good.
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