TM260 placement on stern

[Fastfish]

Hello, I've got a TM260 1kw to fit but cannot gut it out to 6" minimum outside of the outboard prop swing radius as per Airmar instrustions due to the trim tabs that are 18"wide. I would be able to get it to 2-3" outside of prop swing radius. The boat is a mid 90's Seaswirl striper 2100wa and has a 250hp Suzuki. The outboard is on a bracket so is set back 14" from the transom itself where the transducer will be mounted.
My question is will it be OK as it is a lot further away in front of the prop rather than being beside it on a normal flat transom?
I thinking it'll probably be more of an issue to the engine due to causing aeration to the prop, could live with that though if i could get it to work at speed.
Thanks All

 

[FishTech]

Having the engine further back will not be of much help, especially at speed. I would not want to "live with" any cavitation either as it can quickly cause damage to your engine. Not to mention the poor performance and rapid power loss while turning or trying to get on plane.
If you are set on using that transducer, I would place the transducer as best you can per Airmar's instructions and test it out.

 

[Fastfish]

Having the engine further back will not be of much help, especially at speed. I would not want to "live with" any cavitation either as it can quickly cause damage to your engine. Not to mention the poor performance and rapid power loss while turning or trying to get on plane.
If you are set on using that transducer, I would place the transducer as best you can per Airmar's instructions and test it out.

I have been thinking of going to a thru-hull, a tilted element would probably be the easiest on this boat but id need to fit 2, a low and High freq. I'm afraid i might not be happy with the performance wit these units though, if theyre getting air passing them. The best would be a 1kw dual freq in a high speed fairing in the centre of the keel line down aft in the bilge well. It would work perfect on the trailer etc but my worry there is if it would interfere with the O/B, cause aeration on the prop etc, have you had experience on this set-up?

 

[FishTech]

If you put anything in front of the prop, it is going to interfere. The low profile pair might be the best option. Do you have any pictures of you boats bottom out of the water? What is the make and model?

 

[Fastfish]

If you put anything in front of the prop, it is going to interfere. The low profile pair might be the best option. Do you have any pictures of you boats bottom out of the water? What is the make and model?

Yes its a mid 90's Seaswirl striper 2100wa and heres a few pics of the stern, I don't have any of the bottom with me at moment.

 

[FishTech]

They definitely made that difficult for you.
What fish finder are you connecting the transducers to? The 526TID-LTDxx (either 12 or 20) is an option, but they aren't the most popular.

 

[Fastfish]

They definitely made that difficult for you.
What fish finder are you connecting the transducers to? The 526TID-LTDxx (either 12 or 20) is an option, but they aren't the most popular.

There’s a gp1971f connected to existing p66 and I also have a fcv-588 which I want to use on a 50/200 transducer. Also looking to get a 1 kw running on the 1971, looked a chirp LWH Type ducer for upper water column pelagics so a wide beam. also possibly upgrade to the fcv-800 and sell 588.

 

[FishTech]

GP1971F can only operate one channel of CHIRP.
Upgrading to an FCV800 would allow you to do a pair of low-profile B175 transducers. That is a very popular pairing.

 

[Fastfish]

GP1971F can only operate one channel of CHIRP.
Upgrading to an FCV800 would allow you to do a pair of low-profile B175 transducers. That is a very popular pairing.

Thanks for your thoughts. Do you think a 1kw high speed fairing block would work on this hull without causing handling issues? I'd mount on stb side of the keel line up a bit to clear trailer

 

[FishTech]

I would not put a 1kW high speed fairing block on your boat. I think the smallest vessel I ever put one of those on was a 40' inboard.

 

[Johnny Electron]

I agree with Fishtech, I think Airmar specifically says the 1kw high speed blocks require a minimum 30ft boat. You can really mess up your steering due to drag.