Transducer bubble diverter
I have had three transducers on the boat in the normal position without much success. I have put a TM260 way out to the side to get it to work.
I had some success with a totalscan sikaflexed straight to the bottom of the hull. I have always believed it is the hull creating bubbles so I decided to try and make something to divert the bubbles away from the transducer so I just sikaflexed a piece of thin ally plate in front of the transducer to try and send bubbles away from the transducer it actually worked. Doing 24 MPH in 35m it was working great.
This could be something for Gruntre to investigate for his problems.
Keep in mind I am not an expert on water flow [just a dumb sparky] so I may have just got lucky.
Grumbler
Posts: 19
Date Joined: 31/07/18
Interesting. Thanks for
Interesting. Thanks for sharing. I was thinking about something like this for my totalscan. Looks like it worth to try.
Silver Fox
Posts: 1097
Date Joined: 19/06/14
Interesting
is the front of the totalscan flat ( vertical ) ? . If so you might want to get some wood and make a bullet head for it to streamline it . If you wanted to get super fancy make a resin one ... :) . If you’re anal about drag you can make one for the rear too.
My wife understands why I clean my rods n reels in the shower....
crano
Posts: 695
Date Joined: 04/11/09
Silver fox
Yes it is in front. I will make something like a proper fairing block. I also am considering ditching my bit of ally and just trying it with a 10 or 12mm spacer and seeing this gets it clear of the bubbles.
Grumbler
Posts: 19
Date Joined: 31/07/18
Mine sits on flush mount
Mine sits on flush mount bracket. It gives about 16mm separation from the hull. I am still having problem with signal. Picture is clear up to 11 knots, then degrades slightly to about 13 knots. After that it begins to break. Bottom looks like dashed line with spaces filled with noise from top to bottom. This is an improvement since I moved transducer to the bottom from its original location on the transom. There it was loosing bottom completely at 15-18 knots.
gruntre69
Posts: 533
Date Joined: 15/10/16
Thanks mate,Yes this is on
Thanks mate,
Yes this is on my radar, I'm thinking of doing a test with something like this. I'd very much like to see before and after sounder shots with similar setting, conditions and speed...
Marine trimmer NOR (available for clears, tops, carpet, upholstery, custom equipment covers)
crano
Posts: 695
Date Joined: 04/11/09
Gruntre69
Essentially just a very stop start picture before, now all the the missing bits are there.
Silver Fox
Posts: 1097
Date Joined: 19/06/14
Nice one
You’re the smartest sparky I’ve come across. Look forward to seeing the final result .
My wife understands why I clean my rods n reels in the shower....
scubafish
Posts: 949
Date Joined: 15/08/12
deflector
I would say you are probably creating more bubbles with the shield there than not.
http://img.gg/BQ91Sys
Ant1derooster
Posts: 32
Date Joined: 13/09/16
Agreed
I agree. Turbulence and cavitation behind that plate at high speeds I would think. Would be better off designing some sort or "smooth" bulb on the hull to disperse and bubbles away from the transducer
gruntre69
Posts: 533
Date Joined: 15/10/16
Conventional wisdom is with
Conventional wisdom is with the comments shown but the proof is in the pudding. This is why I wanted to see the screen shots... It looks like a massive turbulence creator but I really don't know how much turbulance affects sounders. I'm certain that air bubbles are the worst enemy..
Marine trimmer NOR (available for clears, tops, carpet, upholstery, custom equipment covers)
wagyl
Posts: 218
Date Joined: 08/03/09
Lowrance flush mount fitting
Lowrance do make a flush mount fitting for under the hull I think. CH Smith have them, just google 3D transducer flush mount bracket. Has anyone used one of these as mine is crap at any speed.
crano
Posts: 695
Date Joined: 04/11/09
scubafish
I agree it goes against what should happen in theory but it worked in this case. I did not really think it would work but for ten minutes work was worth a try.
The TM 260 is still a lot better option when travelling but I like the idea of a 15 degree beam that the totalscan has compared to six degrees on the TM 260 for finding new ground.
I will try to make something a bit less agricultural one day
Alan James
Posts: 2206
Date Joined: 30/06/09
...
I always remember this portion of the problem solving flowsheet.
Does the damn thing work --> Yes --> Don't fuck with it --> No problem
scubafish
Posts: 949
Date Joined: 15/08/12
trany
Hey Crano,what was causing the bubbles in the first place and how long is the boat ?
I have a simm prob with mine as it is only 17ft Bubbles are created from the bow as I dont displace enough water to get clean water under the boat,side scan trany still off the back but will only operate at low speed when the boat displaces the most water with bow down on trim.
Just a suggestion,try to make the front edge of the trany a bit more like a strake than a deflector (mould and taper off)
Fluid flow is generally broken down into two different types of flows, laminar flow and turbulent flow. Laminar flow is fluid motion in which all the particles in the fluid are moving in a straight line.
http://www.reactor-physics.com/engineering/fluid-dynamics/laminar-flow-vs-turbulent-flow/
http://img.gg/BQ91Sys
crano
Posts: 695
Date Joined: 04/11/09
scubafish
The boat is a 6m signature. I am obviously only assuming it is creating bubbles as nothing works around this part of the hull. With the TM260 I made a bracket that was adjustable up and down and angle of transducer with out any luck.
Had a quick look at the fluids link. looks like an interesting read and I hope I can learn something from it.
scubafish
Posts: 949
Date Joined: 15/08/12
Crano,
all good mate trial and error is the best way to go and the process is a lot of fun as well.I put in a P79 thru hull works ok dont notice any loss in sensitivity but ok for my small boat,holds bottom at a reasonable speed rear transom just didn't work.trial and error good luck and have fun.
http://img.gg/BQ91Sys