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transducer/fairing block

Old 04-28-2003, 09:16 PM
  #1  
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Default transducer/fairing block

I plan to rig a 27 foot panga with a bronze thru hull transducer. The bottom of the boat has about a six foot long flat keel area extending from the transom toward the front in the shape of a long triangle aprox 12 inches wide at the transom end. My question is, can I simply put the transducer on the flat bottom without using a fairing block? Someone told me I may need the block to prevent cavitation. What do you think?
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Old 04-29-2003, 05:13 AM
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Default transducer/fairing block

If you have access, why not flush mount in that big flat space? Also Air Mar makes flush mount type tranny, they look like pucks with a flange, they would be perfect because of no hang down. Usually you wouldn't want to have any protrusion in front of prop, and for safety nothing hanging down lower than keel. Read info at Air Mar's website, they make almost all the trannys anyway.
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Old 04-29-2003, 04:44 PM
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Default transducer/fairing block

You DON'T need a fairing block unless the botton is NOT flat. The only pupose of the fairing block is to make the ducer point in the right direction, DOWN.

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Old 04-29-2003, 05:47 PM
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Default transducer/fairing block

I'm not sure what type of transducer you are using, but Airmar is really big on having people use the high speed fairing block even on flat surfaces. They are afraid that it will spin and come lose or let water in. The airmar fairing block has an anti-rotation bolt that also goes through the hull to keep the entire contraption from rotating.

I'm getting a new fairing block and transducer installed this week. Furuno tells me that the high speed fairing block will also help keep readings at higher speeds.
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Old 04-29-2003, 06:30 PM
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Default transducer/fairing block

Rosco,

Do you have a flat surface situation ? Like helpu2c, I have the same "flat triangle" along keel that seems to be an obvious location for a xducer mount (my boat is Parker 23'). I'm sitting on the fence regarding HS fairing block vs flush mount for this location. I have read other posts that warn of "xducer induced" cavitation for mounts close to centerline for single engine configs. In any case, I would like to know how your rig turns out, as I am also a Southern Marylander. Good luck !
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Old 04-29-2003, 07:00 PM
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Default transducer/fairing block

Yep, I have a "pad" down there as well. The folks at the marina are going to install the high speed fairing on that flat "pad" area. The fairing block is pretty huge, but looks pretty aerodynamic. I kind of have unusual circumstances since my boat has two steps on the hull. The best place to mount it would be in front of the first step, but that area rests on my boatlift, so it'll be mounted on the pad behind the second step. There's caviation all over the place, but the high speed fairing block should get me a little deeper into the water.

I'll let you know how it works. I'm getting pulsedrives installed as well. When you see a big nasty roostertail going up or down the Pax, it's me.
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Old 04-29-2003, 07:04 PM
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Default transducer/fairing block

oh, I forgot to mention that I am running twins so having that high speed fairing block down the center was not an issue.
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Old 05-01-2003, 10:49 AM
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Default transducer/fairing block

Rosco,

yes just put it in the middle as far forward as possible. I did the same on a 25' Parker.
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Old 05-01-2003, 06:00 PM
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Default transducer/fairing block

BTW all,

I have ordered the Airmar B45 xducer and high-speed fairing - will mount centerline on the 'pad', about 2.5' from transom. I'll let everyone know how this turns out.
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