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Old 09 October 2013, 04:45   #11
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Originally Posted by Trimix View Post
Good point Chris, but can I not calibrate it or set somthing in my Garmin 750S so it sounds an alarm at a certain depth ? I seem to remember reading that in the instruction manual.

Just how far in front will it read ? I imagine the sensor reads down in a cone shape, so the deeper it goes the wider the cone - whereas in a meter or two its not had time to spread out, so I suppose its probably only reading a meter or two in circumference.
yes, i guess the 750 will have similar alarms to the 4008, there should be a depth alarm setting in there somewhere, i just dont like alarms n buzzers going off when im out on the rib, i even turn me mobile to silent

as you say, the deeper the water the bigger the cone gets. one thing i have noticed is that shallow silty water does confuse it, so just back right off n take it nice n steady. mine seems to work well, even travelling at a fair speed thru the menai straits it picks up the sudden changes in depth as marked on the chart so im happy with the setup

im looking at a 750 to fit on the SR4, but in no rush to do it yet, waiting to see if there are any good offfers on over the winter
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Old 09 October 2013, 05:01   #12
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If you go for the sump fixing option, you need to ensure that there is solid GRP between the txr & the water, no voids, foam, wood etc. It needs to be transducer-solid GRP-water. You can get transducers specifically for the job, as someone already mentioned, they are mounted in a tank of antifreeze bonded to the inside of the hull, this is what I have on BP. If you don't want to got to that extent, then experiment with bonding an ordinary txr. You can try various mounting positions (ooer missus) by filling a bag with water & sitting it on the proposed fixing spot, put your transducer on top of the bag & see if you get a clear echo, the boat needs to be on the water at this point, obviously Alternatively, you can use KY between the txr & hull to test the position, if you're happy with the echo, glue the txr in that position. Personally I'd use epoxy to fix it, but others have had good results using mastic. Time spent now getting it right pays off later, it took me over a day to get my txr positioned & fixed, but I get a faultless bottom trace at all speeds up to WOT, 40kn ish.
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Old 09 October 2013, 05:49   #13
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Cheers Pikey Dave, I will certainly be spending the next few months fiddling about with everything.

Ive ordered one that will cope with a deadrise from 2 to 22, so once ive got it i will have a look in the area I plan to fit it and measure the deadrise.

Fiberglass should be no more than 5/8" thick according to the instructions - no idea if this is the thickness of my boat till I get home.

But as you suggest, i will place it in a temporary way and see if it works properly.
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Old 09 October 2013, 09:47   #14
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Quote:
Originally Posted by Pikey Dave View Post
Time spent now getting it right pays off later, it took me over a day to get my txr positioned & fixed, but I get a faultless bottom trace at all speeds up to WOT, 40kn ish.
+1 took us best part of a day to get the position right and get it properly fixed to the hull,but well worth the effort in the end
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Old 14 October 2013, 12:36   #15
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FWIW the transom mount transducer I got with my (used) plotter was gooped onto the bottom of the previous owner's hull with epoxy.

Another thought:

You say you only really want tio use it at slow speeds. Why not mount it on the transom of one of your hulls - if it's out the water at speed and you don't want to use it - is it a problem if the display shows "err"?
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Old 14 October 2013, 12:53   #16
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Well it will look neat and tidy hidden inside, and then I never have to worry abou it - whatever speed I end up doing.
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