P79 HIGH SPEED IN HULL TRANSDUCER

[TroyBoy30]

I'd follow the install instructions from airmar which are pretty much what I posted above. the p79 is not a normal puck transducer. the CHIRP Models are: P75M, P95M

http://www.airmartechnology.com/uplo.../17-217-01.pdf

6. When you are satisfied that the location of the transducer is
optimal and the orientation of the base corresponds to the
deadrise angle of the boat, apply a generous bead of silicone
sealant to the underside of the flange of the base. (Follow the
sealant manufacturer’s instructions for its use.) Press the flange
firmly in place to form a liquid-tight seal. Allow the sealant to cure

[Marshfly]

I'd follow the install instructions from airmar which are pretty much what I posted above. the p79 is not a normal puck transducer. the CHIRP Models are: P75M, P95M

http://www.airmartechnology.com/uplo.../17-217-01.pdf

6. When you are satisfied that the location of the transducer is
optimal and the orientation of the base corresponds to the
deadrise angle of the boat, apply a generous bead of silicone
sealant to the underside of the flange of the base. (Follow the
sealant manufacturer’s instructions for its use.) Press the flange
firmly in place to form a liquid-tight seal. Allow the sealant to cure

So you have Airmar and an authorized dealer of Airmar telling you to follow the intructions. All I can do is shake my head.

[BassFishin Electronics]

Just installed my P79 today and used epoxy directly to the hull just like every other transducer I've ever installed. I will test it out next week and let you know how it does.

[Hickory Legend]

O no you didn't

[Marshfly]

Just installed my P79 today and used epoxy directly to the hull just like every other transducer I've ever installed. I will test it out next week and let you know how it does.

I'm sure it will be fine, but not optimal. Transducers are designed to transmit through liquid. Anything else between them and the water degrades the signal. Adding a layer of epoxy will effectively double the layer of hard stuff between the element and the target.

Can one person on here explain the reasoning behind using epoxy rather than just following the instructions? It's not like using the antifreeze is hard. The stuff is available at Walmart and takes 3 minutes to put in the ring.

[TroyBoy30]

agreed. itll probably work but not as well as it should

[Hickory Legend]

Sitting in antifreeze then shooting thru the hull vs shooting thru the hull??

Airmar transducer is made for different deg. of hull angle and many applications. If the mounting area isn’t flat or close to it you would need the cup to shoot straight down, and the antifreeze to take up the airspace between the transducer bottom and hull.
Chirp needs to be in water to help cool it.

Sonar signal needs to go thru something solid not sure it would work just to silicon the puck to the hull, and I’ve never had luck with silicon hold long in any application.

I would say 99% of the bass boats have a trolling motor or transom transducer epoxied in the hull.

Of course you can do it with the cup like you said, benefit being you could remove it and swap it out with a like transducer.

[Jig34]

I'm curious where the liquid for a P74 is?

http://www.airmar.com/uploads/brochures/p74.pdf

Trolling-MotorIn-Hull
600 W
Applications

• Trolling-motor mounting for all popular motors
• Portable mounting for small, slow moving vessels
• In-hull mounting in planing hull powerboats andcruising sailboats over solid berglass only

[huntertn]

P79 uses a liquid reservoir but the P74 does not.

[Jig34]

My point exactly...some in here are convinced that the P79 needs a "liquid" reservoir to operate correctly.

Does that mean the P74 is an inferior transducer? If the OP had asked about epoxying a P74 directly to the hull, we would have never made it to page 2.

The reservoir is is to accommodate up to a 22 degree dead rise.

P79 uses a liquid reservoir but the P74 does not.

[TroyBoy30]

im sure you guys know best

[Marshfly]

I'm curious where the liquid for a P74 is?

http://www.airmar.com/uploads/brochures/p74.pdf

Trolling-MotorIn-Hull
600 W
Applications

• Trolling-motor mounting for all popular motors
• Portable mounting for small, slow moving vessels
• In-hull mounting in planing hull powerboats andcruising sailboats over solid berglass only

This thread isn't about the P74. Look at the P79 datasheet next to the P74 data sheet. The specs aren't the same except for the power and 50kHz beam width. The P79 weighs 4 times what the P74 does. It's not just the same transducer with a mounting ring.

Like Troy said. I'm sure you guys know better than the engineers over at Airmar.

[Hickory Legend]

I agree with you and Troy in an application where the mounting surface is 10-22deg. Or if it was one of the Chirp transducer.

[Jig34]

Marsh fly, you said “Transducers are designed to transmit through liquid.”

i simply asked where the liquid for a P74 is?

This thread isn't about the P74. Look at the P79 datasheet next to the P74 data sheet. The specs aren't the same except for the power and 50kHz beam width. The P79 weighs 4 times what the P74 does. It's not just the same transducer with a mounting ring.

Like Troy said. I'm sure you guys know better than the engineers over at Airmar.