Airmar P66 transducer questions

Post Options Post Options   Likes (0) Likes(0)   Quote Nickfixit Quote  Post ReplyReply Direct Link To This Post Topic: Airmar P66 transducer questions
    Posted: 22 Dec 2014 at 9:23pm
Nickfixit View Drop Down
Silver
Silver


Joined: 06 Sep 2011
Status: Offline
Points: 276
More specifically does anyone here run this transducer? 

What speeds can they read the bottom at? I'm not talking about just finding the depth, I mean see the bottom and not have it cutting in and out. Even better can you mark fish while at speed on the plane? 

Does anyone run this transducer on a Buccaneer? Or a Buccaneer 525 Billfisher? How does this work for you at speed?

I have a Airmar P66 Transducer hooked up to a Furono FCV620 on the 525 Billfisher and it is a great combo when drift fishing or driving slowly. Very powerful unit and picks up fish I never could see before - in fact I am still learning how to recognise different marks as different fish. The only problem I have with it is that when I get onto the plane it does not hold the bottom well. It might hold it for a minute, then cut in and out, and then not hold it for a few minutes, then hold it again, etc. It seems that while cornering on either direction it has a solid bottom lock...

I downloaded the Airmar installation instructions and it seemed like it was positioned fine - other than being on the port side not the starboard side - but the fact that at slow off non planing speeds it reads well I figure that the propeller is not interfering and therefore shouldnt effect planing speed either so being on port side should not affect it?

I note there is a chine towards the bow that ends half way down the boat that is close to the transducers line of travel but I think because the chine ends half way up that the smooth hull would sort the water out? It certainly appears that way when I observe the water out the back of the boat when planing - it looks like it is just the chine that runs right to the stern that is aerating the water. 

I have tried it with the wedge to angle it forwards - i.e. lower the back of the transducer more to the front. Took it for a test run and marginal improvement but not much better - altho a bigger rooster tail now to before (but not much bigger). My next idea is to try lowering it 7 or 8mm and see if putting it deeper improves things. If that doesn't work I can try putting the wedge the other way to decrease the angle so it is more parallel to the hull rather than angled. Unfortunately the guy who installed it drilled the holes so that the transducer can't be raised any higher then it is so I can't test it in a higher setting without drilling new holes, and I think if I'm going to drill new holes it may pay to relocate it somewhere else anyway? 

Really appreciate any advice you can give me as I'd love to get this working to its full potential.

Is it too much to ask to be able to get a solid reading and even better see some fish sign as I am driving?

Photos taken with wedge in (bigger angle than when I first got it)













Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote viscount Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 12:04am
viscount View Drop Down
Gold
Gold
Avatar

Joined: 22 Apr 2010
Location: Mighty Bay
Status: Offline
Points: 607
I have one but not on your boat type, I can see the bottom at speed and it works out to 200+ meters but that's when trolling and at 50hrtz, I have played around with the settings as well try using the gain settings and taking it off auto or ask where you brought it off to go out with you and help set it up, mine is hooked up to a Raymarine, I have the same rooster tail behind the boat as well.
Calling fishing a hobby is like calling brain surgery a job - Paul Schullery
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote mozz Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 2:59am
mozz View Drop Down
Titanium
Titanium
Avatar

Joined: 15 Feb 2005
Location: Bahamas
Status: Offline
Points: 6596
I also have one but its a through hull and a completely different hull type.
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Garry 23041 Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 6:52am
Garry 23041 View Drop Down
Platinum
Platinum


Joined: 19 May 2007
Location: Mangonui
Status: Offline
Points: 2231
Mozz I have the through hull also in a glass boat which is moored so it's great to have it out of the way and clean.
 
Works well but does lose fish pretty fast when over 14knots....
 
How does yours work?
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Nickfixit Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 6:53am
Nickfixit View Drop Down
Silver
Silver


Joined: 06 Sep 2011
Status: Offline
Points: 276
Hi viscount that's great to hear. Is it on the port side or star board side? any chance you can take some photos showing it in relation to under the hull for seeing where it is positioned in relation to strakes etc? Also showing how deep it is compared to the hull and the angle of the face of the ducer compared to the hull?

All auto Modes are off and in manual for gain, range etc. doesn't seem to make much difference yet fiddling with settings. I thought maybe in 50hz mode it would hold the bottom better because of the wider cone but no success there
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote pompey Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 8:16am
pompey View Drop Down
Platinum
Platinum


Joined: 02 Sep 2011
Location: kerikeri
Status: Offline
Points: 1349
Nick, I have the same problem as you.Only reads at very low speed or drift. I will alter position to see if it improves but it looks set up correctly. If you have any success, please let us know.
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Cbro Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 8:27am
Cbro View Drop Down
Platinum
Platinum
Avatar

Joined: 23 Oct 2008
Location: Far North
Status: Offline
Points: 2501
Looks like it could be the angle more than anything. Speed was never an issue with the same set up as you.

Good luck.

Oh you should make sure it's not kicking up at speed.   I had this issue an screwed the bugger down.
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote viscount Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 9:14am
viscount View Drop Down
Gold
Gold
Avatar

Joined: 22 Apr 2010
Location: Mighty Bay
Status: Offline
Points: 607
I'm working offshore at the moment, it is on starboard side, I had to file the bracket down so it wouldn't interfer with the water flow coming off the hull, I put it at the lowest I could go and there's no strakes to make any interference, I'll look thru pic's and see what I have.
Calling fishing a hobby is like calling brain surgery a job - Paul Schullery
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote JB Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 9:17am
JB View Drop Down
Platinum
Platinum
Avatar

Joined: 16 Sep 2002
Location: Christchurch
Status: Offline
Points: 1629
Hi, I've got the exact same set up as you on my trophy 21 footer. I'll take a picture of the transducer position tonight. One key thing I found was taking it off auto gain (or fishing etc) and us the manual gain knob. I find it makes a lot of difference. I turn up the gain (say to 8-9) when on the plain, enough to get a strong hold on bottom with a little clutter. and then when slow and hunting on stationary I turn it down to say 6. I found after a few days doing this I got really good at turning it. I now have got it to a point where I can see blue cod hiding in weed when hunting and get the bottom strong on the plain to see school of fish and rocks. I'll get a transducer shot tonight of its position. I have not noticed a rooster tail.
See attached some photos - they are 2 shots of blue cod in the weed on the bottom, one of couta (the one with stacked horizontal lines and a school) plus terakihi on the top of the weed.

regards
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Nickfixit Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 11:18am
Nickfixit View Drop Down
Silver
Silver


Joined: 06 Sep 2011
Status: Offline
Points: 276
Cbro - which way do you think the angle needs to be adjusted? 

Its not kicking up out of the bracket but I have heard of this happening
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Imortal2 Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 11:23am
Imortal2 View Drop Down
Gold
Gold


Joined: 22 Jan 2004
Location: New Zealand
Status: Offline
Points: 560
Auto or manual won't make a difference. Is it line with the front strake?  If the front strake is in line move it up the hull so it is away from the aeration caused by it. Put it as low as you can without the bracket protruding below the hull. If placed correctly will work as fast as that yammy can push ya boat
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Nickfixit Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 11:24am
Nickfixit View Drop Down
Silver
Silver


Joined: 06 Sep 2011
Status: Offline
Points: 276
viscount - you have got it low if you had to file the bracket down! I can go at least 10mm lower before the bracket is below the hull and sounds like this is worth trying. 

Do you think the strake you can see that finishes a couple of meters before the stern will affect it much? It doesn't appear to me that it affects the water column in the photos I have put up.


JB - good to hear your setup works so well. hoping I can get mine to do the same. I have fiddled with the manual gain while planing and doesn't seem to make any difference but it sure makes a huge difference when drifting. very impressive units - they make finding a needle in a haystack more possible
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Nickfixit Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 11:28am
Nickfixit View Drop Down
Silver
Silver


Joined: 06 Sep 2011
Status: Offline
Points: 276
imortal - it is approx 60mm away from the front strake. sounds like I need to try going a lot lower first and if still no good i might need to move it another 60mm away from the front strake - so 120mm away in total but keep it away from the next strake over that runs right to the stern. ? 


Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote mozz Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 1:31pm
mozz View Drop Down
Titanium
Titanium
Avatar

Joined: 15 Feb 2005
Location: Bahamas
Status: Offline
Points: 6596
Originally posted by mozz mozz wrote:

I also have one but its a through hull and a completely different hull type.


Works well up to 34 knots then we loose it. Mostly navigating in under 20 of water though. Ours is terrible for anything over 80m so ripping it out for a much bigger thru hull.
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote mike_e Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 3:40pm
mike_e View Drop Down
Gold
Gold
Avatar

Joined: 04 Aug 2009
Location: Nelson
Status: Offline
Points: 519
put it further down till corner of transducer bracket on motor side is level with edge of hull.

You will be getting water turbulence rolling off the rear of the hull at the moment
If you can go home and pull a $100 bill out , and flush it down the toilet, and if that doesn't bother you, then go ahead and buy a boat
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Ohsoslow Quote  Post ReplyReply Direct Link To This Post Posted: 23 Dec 2014 at 4:05pm
Ohsoslow View Drop Down
Gold
Gold


Joined: 02 Nov 2011
Status: Offline
Points: 846
I had to lower mine quite a bit to get a decent signal.. Still only works up to about 35knots (under 50meters) and then bracket releases and kicks up at 45+knots.. Stupid thing!
Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Nickfixit Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 2015 at 10:41pm
Nickfixit View Drop Down
Silver
Silver


Joined: 06 Sep 2011
Status: Offline
Points: 276
finally got out to test it after lowering it approx 10mm which got the mounting bracket flush with the hull and it is better but still cannot hold bottom even at 35-40kmh. rooster tail was even bigger after lowering it

am thinking of keeping it low but removing the wedge which will bring the trailing edge up a bit but still keep it lower than the trailing edge. am i wasting my time trying this? 

if i go even lower so the mounting block is below the hull, will this extra turbulence make it worse? 

how deep below the surface are the faces of these supposed to run?

looking forward to getting this finally sorted.


Back to Top
Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 2015 at 11:38pm
Smelly Buoy View Drop Down
Silver
Silver
Avatar

Joined: 28 Feb 2007
Location: Howick Auckland
Status: Offline
Points: 503
Had similar issues with my last boat and got nowhere with adjusting the transducer position. But that boat had a mounting platform bolted on to the transom which had fibreglass stiffening edge that I think was creating back eddies. I wonder if trying a run without the planing plate on your motor would give a different result - maybe get the 4rse of your boat sitting a little deeper so the transducer doesn't get aerated. On my old boat, I ended up installing a 2-way switch, & put a through hull transducer in the bilge, and ran that on 83MHz to shoot through the hull when planing. Had to mount that over the centre keel to avoid the closed-cell sandwhich material of the hull, and had to silicone it in place taking care to not trap air in the silicone.
Tangled Up In Blue
"Veni, Vidi, Velcro"
I came; I saw; I stuck around.
Back to Top
Forum Jump
Forum Permissions View Drop Down


This page was generated in 0.250 seconds.

Fishing Reports Visit Reports

Saltwater Fishing Reports
Bream Bay Fishing Report - 18/04/24

Change in seasons, change in tactics Not a lot to report in the ‘big fish’... Read More >

18 Apr 2024
Freshwater Fishing Reports
Canterbury Fishing Report - 04/04/24

Fish galore! Coming off the back of Easter Weekend and with some very nice weather... Read More >

05 Apr 2024
Saltwater Fishing Reports
Raglan Fishing Report - 04/04/24

Excellent snapper action There is some excellent autumn snapper fishing straight out and up the... Read More >

04 Apr 2024
Saltwater Fishing Reports
Bream Bay Fishing Report - 04/04/24

Whangarei Harbour fishing well Like the weather, the fishing has been patchy throughout Bream Bay... Read More >

04 Apr 2024
Fishing bite times Fishing bite times

Major Bites

Minor Bites

Major Bites

Minor Bites