P66 set up

Furuno 588 is losing the bottom above 6 knots, no bottom or depth display, P66 starboard transom mount on a Barcrusher Gen 2. Currently got one wedge and have tried the recommended set up of 3mm below hull to around 8mm below the hull. With the boat on the trailer jockey wheel fully extended to simulate planing at speed the tranny is pretty well horizontal.  I'm going to try lifting it to around 1mm as per the pic, if that doesnt work I'll put another wedge in to tilt it back some more and go through the height adjustment process again. Occasionally at 20knots it picks up the bottom, next time out I'll try the turning to port and starbord and adjust the trim to get an indication of where it want to be, HT opinion seems to be "these transducers need to be buried below the waterline' any other suggestions ?

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Posts: 251

Date Joined: 28/07/11

 I have mine 'buried' and

Fri, 2016-09-16 07:06

 I have mine 'buried' and that got me the best results, so I have the mounting bracket as low as it can go before the corner pokes down below the hull.

Posts: 3881

Date Joined: 01/02/10

 I used to bury mine as well.

Fri, 2016-09-16 07:39

 I used to bury mine as well. Still with mixed results. 

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Does anyone know where the love of god goes, when the waves turn the minutes to hours?

gillyL's picture

Posts: 6085

Date Joined: 26/04/14

 Got a side pic? Be

Fri, 2016-09-16 09:36

 Got a side pic? Be interested in seeing the mounting plate 

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lucky i love to fish because i cant catch any.

 

BM294

Feral's picture

Posts: 1457

Date Joined: 01/11/06

 doesn't look deep enough to

Fri, 2016-09-16 10:03

 doesn't look deep enough to my eyes.  Try taking a pic whilesitting on the floor and lining the hull up straight and flat.  Also the back end of the transducer should be pushed down a little so the signal fires toward the front of the boat.  If they are perfectly level then most of your signal is lost out the back of boat at speed 

Coastrunner's picture

Posts: 254

Date Joined: 25/10/14

Cheers for the input fella's,

Fri, 2016-09-16 10:19

Cheers for the input fella's, gilly I will take a side pic and post up, Feral those pics are with the tranny at the highest adjustment possible without moving the mount, I havnt tried that setting yet, I was thinking with the lower settings, close to 10mm below the hull line on the left corner of the tranny I may have been getting turbulance but now I'm thinking I need to put another wedge in to lower the tail edge and go lower overall.

Posts: 563

Date Joined: 27/08/09

1: With the hull level you

Fri, 2016-09-16 10:23

1: With the hull level you want the back of the transducer to sit lower than the front.

 

2: nearly all "loss of signal at speed" can be put down to bubble entrapment. A couple of things I have noticed.....  your hull plate extends past your transom and come back flush near your transducer. This transition point can be a problem. Also there appears to be a protrusion on your hull, forward of the transducer in the second photo. This can cause cavitation and bubble entrapment. 

 

Coastrunner's picture

Posts: 254

Date Joined: 25/10/14

Starbug, thats not a hull

Fri, 2016-09-16 12:01

Starbug, thats not a hull protrusion, its the spare wheel sitting on the draw bar, water coming from under the hull is clean, roger the orientation of the tranny, thats where I'm going to make the next adjustments, cheers for the input fella's.

Posts: 726

Date Joined: 09/10/06

 I know its a different

Fri, 2016-09-16 19:00

 I know its a different tranny but When l fitted my mates 1kw tm260 to his BC l had to use all 4 wedges to get it right due to the transom being vertical. Works great even at 30+ knots

BarraSlayer's picture

Posts: 287

Date Joined: 14/04/14

 I had to use both wedges on

Sat, 2016-09-17 10:23

 I had to use both wedges on my BC gen 2 

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Cheers
BarraSlayer

Coastrunner's picture

Posts: 254

Date Joined: 25/10/14

Added the second wedge and

Mon, 2016-09-19 07:48

Added the second wedge and have the tranny mounted 10mm below the hull line, new pics in the first post, I'll post up how it goes when I've had the boat in the water. Cheers.

Posts: 41

Date Joined: 19/01/16

 Hi fitted one of these up to

Wed, 2016-09-21 22:50

 Hi fitted one of these up to my boat bout 2 months ago I used 2 wedges but ground one halfway down to get a good angle, had the rear just lower than the front. The bottom face of the tansducer was just below the hull, holds the bottom well at 20+ knots like the other guys said make sure nothings infront causing bubles. The last picture looks like the back is a little to low to me good luck

Brock O's picture

Posts: 1994

Date Joined: 11/01/08

Interested to see

Thu, 2016-09-22 11:46

Interested to see results.

Having exact same issues, I've lowered but haven't gone to second wedge as yet...thought enough tilt already there.

Coastrunner's picture

Posts: 254

Date Joined: 25/10/14

Will have the boat out on

Thu, 2016-09-22 12:44

Will have the boat out on Saturday so I'll post up, I agree the second wedge has added more tilt to the rear than recommended, if I get a result with the current set up I will get another wedge and linish it down and try a 1.5 wedge set up. Cheers.

Coastrunner's picture

Posts: 254

Date Joined: 25/10/14

 Success, set up as per the

Sun, 2016-09-25 12:56

 Success, set up as per the last 3 pics in top post with 2 wedges and set 8mm below the hull line the sounder was holding the bottom in up tp 40M at 20 knots, didnt get to try it at faster speeds as it was a bit choppy out there on Saturday, cheers for the input. 

Brock O's picture

Posts: 1994

Date Joined: 11/01/08

 Good stuff, I've got a secon

Sun, 2016-09-25 15:48

 

Good stuff, I've got a secon wedge I'll through it in and see how it goes on mine.

Coastrunner's picture

Posts: 254

Date Joined: 25/10/14

Brock O your probably onto it

Wed, 2016-09-28 10:14

Brock O your probably onto it but check the transducer model code selected in your set up matches the actual tranny.

Brock O's picture

Posts: 1994

Date Joined: 11/01/08

 Was reading that in another

Wed, 2016-09-28 19:17

 

Was reading that in another post regarding a 1 kW, can't remember that being critical...as long as I've selected the 600w, from memory I did select specific model as mine doesn't have the temp or speed option.

 

But I will try dig up receipt and model so as to check again, previous boat some tranny and setup as per standard it was mint to above 20kt....this is shit house atm, put extra wedge in and will try tomorrow night.