convergent
Petty Officer 1st Class
- Joined
- May 17, 2010
- Messages
- 385
I am replacing an outdated fishfinder and transducer with a new Garmin EchoMap with SI/DI. I have removed the old transducer and speed/temp sensor from the hull. There are remaining 4 holes that need to be filled from the two old units. First question is if it is OK to just fill these holes with 3M 5200 sealant. I bought 4200 to use on the new installation, but thinking 5200 would be better for these holes. This is below water so I am not really that concerned with how it looks, which is one reason given when people recommend resin and gelcoat. The holes for the new mount will be a bit higher so should go near these holes.
Next question is exactly how to mount the new transducer which I'm a bit nervous about. The new unit is a lot bigger than the old so would be much more prone to bumps. Its hard to tell from the picture, but the shape of the hull starts to curve quite a bit the further you get from the center. If the transducer is angled a slight bit in, vs. being exactly parallel with the boat travel, is that a problem?
I don't believe that the roller there is a concern because the boat is quite a bit up above it, but mentally it seems like it would be a problem even though I'm telling myself it won't hit it. The old transducer was mounted so that it stuck down below the bottom plane of the hull just a bit. Is that the correct placement, or should it be so that the bottom of the transducer is even with the bottom plane of the boat? I'm thinking that I'll mount it kind of between where the other two units were mounted and seal with 3M 4200.
Any thoughts on the placement and sealant for holes and mounting?
Next question is exactly how to mount the new transducer which I'm a bit nervous about. The new unit is a lot bigger than the old so would be much more prone to bumps. Its hard to tell from the picture, but the shape of the hull starts to curve quite a bit the further you get from the center. If the transducer is angled a slight bit in, vs. being exactly parallel with the boat travel, is that a problem?
I don't believe that the roller there is a concern because the boat is quite a bit up above it, but mentally it seems like it would be a problem even though I'm telling myself it won't hit it. The old transducer was mounted so that it stuck down below the bottom plane of the hull just a bit. Is that the correct placement, or should it be so that the bottom of the transducer is even with the bottom plane of the boat? I'm thinking that I'll mount it kind of between where the other two units were mounted and seal with 3M 4200.
Any thoughts on the placement and sealant for holes and mounting?