'81 H36 depth transducer type/location

[tmjb]

My recently acquired '81 Cherubini H36 came with Datamarine depth and speed transducers. The depth gauge display is shot and I have no idea if either works (I have a brand new replacement speed transducer if anyone is interested).

I plan on installing the Garmin 740s chartplotter from my previous boat with which I used a 'shoot thru hull' P79 depth transducer which worked very well.

I am trying to decide what type of depth transducer to install and where to install it. My debate is between a depth-speed-temp DST 800 (conventional thru hull) or another P79.

If I use the DST 800 I would want to reuse the 2.125" dia hole from the Datamarine speed transducer since I don't want to cut any more holes in the hull (Can I install the new 2" diameter thruhull in the old 2.125" dia hole using sealant only, ie no fiberglass work?). However the location is not great as I see it being just aft of the head and thus beside the keel.

I am leaning more toward the P79 as I am not so concerned about speed through the water and have read concerns about the valve on the DST 800 failing very quickly. However I am not sure re location. Ideally having it close to centerline in the bottom of one of the v-berth lockers looks great but I am concerned that there may be just too much solid fiberglass there to shoot through particularly on centerline.

I'd much appreciate any experiences and/or thoughts.

Many thanks in advance.

 

[rardiH36]

tmjb:

If you are already set on switching out your Datamarine units, no need to read on:

But if you do have a penchant for attempting to get stuff to work, just to report that I was able to get my dead displays usable again at $0 cost. For a description see Posts #8 and #9 of this thread:

http://forums.hunter.sailboatowners.com/showthread.php?p=744361&highlight=datamarine

And Post #6 from this thread:

http://forums.hunter.sailboatowners.com/showthread.php?p=841373&highlight=datamarine

Not guaranteed to work, but it you have the time and would otherwise just throw them out, no real downside.

 

[tmjb]

Thanks as always.

I plan on installing a Garmin to display the data on my chart plotter.

However, I'd be interested in trying to resurrect this gear if I could. Unfortunately the display on the depth gauge is appears to be completely shot. Looks like water probably got into the LCD itself and froze. I might try and see if the lcd from the speed log gauge would fit as I'm more interested in depth. However I might also just see if I can sell this along with the new speed transducer.

Any thoughts about type and location for a new trnasducer?

 

[Alctel]

I use a B117 (non-tilted version of the B60) on my H36. I installed it pretty much dead center of the boat length wise, on the port side of the keel. The top is under the port settee, in front of the water tank.

 

[tmjb]

Thanks. Presumably it works OK and your are satisfied?

That is comparable to the position of one of my two Datamarine sensors which I could potentially use.

I am concerned about blocking/shielding from the keel.

 

[Alctel]

Works great!