Mounting a 1 kw thru hull in a ub22

[gavsgonefishing]

Has anyone mounted a airmar box for a 1kw tducer in a southwind ub 520, 580 or 670?

i have tried two spots but cannot find the spot where it will read at speed. It's all good at trolling speed but anything over 12 knots it looses the bottom. I am starting to think that these boats have a too shallow draft for the in hull transducers.

If anyone has got these transducers to work properly in these boats I need to no where it is mounted and how it was attached. The sika doesn't stick to the box, and epoxy didn't last long. I am thinking of glassing the bugger in once I know where it should be.

[fromeo]

Don't know about the position other than keep away from planning stakes and steps in the hull which course turbulence and air bubbles , try it as far back as you can get it an just off the centre to starboard , the sika should stick the box to the glass , make sure you scuff up the gel coat / resin and the box bottom and sides , put sika on the bottom of the box and install into you position next day put sika on the outside and inside edges lots of it so you get like a cradle effect, did mine this way and it hasn't leaked or moved its been 3 years . Hope this helps .. just a tip if you want ti find the correct position , try putting the transducer in a plastic bag with water an move it around the hull until you get reading at speed , obvious you will need a helper.

[gavsgonefishing]

Thanks fromeo, I know the basics on how to mount the tducer, its more to do with if anyone has tried to mount one before in these type of boats, and if they went though the same heartache. I am pretty sure that the smaller ub's would have the same shape hull, so theres got to be someone that has done this before.

With the sika issue, the sika does not seem to be able to bond with the plastic, after a month of use it starts leaking. All areas have been well sanded and cleaned, so its got me buggered. The tranducer was actually put right at the stern first, then moved one metre up in the middle on a flat surface with the strakes around 500mm on each side. Its flat all the way to the front so there should be no turbulence, again its got me stuffed

[dan204]

Skipping style hull on your Southwind means will get a lot of turbulent water under the hull at speed, even if it's evenly spaced between strokes. It's in the design an pretty much all long boats.

As for you sticking issue what which sika were you using? In any event throw the sika in the bin and buy Fixtech MSP 190. Comes in a green tube. Very important to buy the 190 as it's hard set bond means no loss of sound in the Transducer, but it'll stick to nearly all surfaces, fibreglass, metals, plastic etc.

[Crunchy]

Could be related to the thickness of the glass in the delta pad section of the UB boats? I have transom mount and works sweet at all speeds so turbulence issue can be overcome.

[gavsgonefishing]

Thanks for that Dan, I will source some of that next time round. CRunchy I have a transom mount as well, it's fine, just wanted the 1kw. I ended up in maroochydore river testing different spots, the best I could come up with is the starboard side where the batts are mounted. It's not the best but a lot better than it was. I build a fibreglass wet box then mounted the tducer on top.