Transducer location

[Fishin_Dan]

Geez Mantaray.... Here I was thinking my piccie was pretty schmick after spending 2 minutes with Microshaft Paint, when you go and post this work of art!!!

It explains it so much better than my pic though...!

Dnej - Don't worry mate, it's usually me making smart @$$ comments...

[magicpudding]

Umm excuse me if i'm wrong, but the prop wash isn't going to be affected by the hull at speed, as the turbulance will be out the back of the boat by the time it rises to the surface. Most badly posintioned transducers drop out at HIGHER SPEEDS, thus the hull interference of the turbulance can have no affect!
Also, regarding the positioning for in reverse. I am yet to go on a boat, big or small, that has a transducer which works effectively in reverse. I think this is caused by turbulance from the hull not the prop.
Just to throw a spanner in the works, what side do you mount the transducer on a boat with 2 counter rotating engines [smiley=jester.gif]

CJ

[Fishin_Dan]

Umm excuse me if i'm wrong, but the prop wash isn't going to be affected by the hull at speed, as the turbulance will be out the back of the boat by the time it rises to the surface. Most badly posintioned transducers drop out at HIGHER SPEEDS, thus the hull interference of the turbulance can have no affect!
Also, regarding the positioning for in reverse. I am yet to go on a boat, big or small, that has a transducer which works effectively in reverse. I think this is caused by turbulance from the hull not the prop.
Just to throw a spanner in the works, what side do you mount the transducer on a boat with 2 counter rotating engines [smiley=jester.gif]

CJ

Hmmm.... Good Point!

However, we all know the answer is IN THE MIDDLE!!!!

[Mantaray]

Fishin_Dan, got to be honest can't lay claim to that piccie, had to borrow it from people who know these things, can't be questioned that way.

[Mantaray]

Somebody mentioned that it doesn't matter if the prop spins clockwise or counterclockwise, it MUST thrust evenly on both sides.

A couple of questions then

1) All things being straight put the engine in reverse does the boil emerge out the left side, the right side or smack bang down the middle?

2) All thing being straight if an engine is put into gear no power on but prop turning over, which way does the stern have more of a tendancy to go, left, right or doesn't move either way.

3) All things being straight if the trim tab was removed from the motor which way would the bow tend when put into forward gear, left, right, won't tend either way?

[DR]

where would it be mounted on a cat?? would the tunnel make any diff to turbulance ??

[Mantaray]

Twins are easy, either side but not in the middle, starboard side of the starboard and port side of the port motor, starboard prop on most twins spin clockwise, port is the counter clockwise motor. If you don't have counter rotating motors then the principle is the same as 1 engine.

[DR]

thank you..will refine my question a bit.
what about a single engined cat ie a WEBSTER would the sponson break the water flow sufficently so that it doesn't matter which side.
reason for q. is i have a webster ,the manufactures bracket is on the port & seems to work fine, will performance improve by mounting on starboard..

[Mantaray]

thank you..will refine my question a bit.
what about a single engined cat ie a WEBSTER would the sponson break the water flow sufficently so that it doesn't matter which side.
reason for q. is i have a webster ,the manufactures bracket is on the port & seems to work fine, will performance improve by mounting on starboard..

The centre sponson might increase the turbulence further as even a conventional/normal keel is a place to keep a transducer away from due to air bubbles and such things.

[basserman]

would distance from the motor be more important???
reason is that on both my boat the tranducers are more to the outside edge of the transom and maybe that is why i get good reading
mainly in the quinny where the mounting plate is on the port side as it has a fairly flat bottom and the mounting plate is almost on the outside edge of the transom

mind you a mianly use the sounder at slow speeds or while lure casting under the elcetric
always wondered about useing the sounder at speed as i would think by the time you have your reading you would already be well past that point

[DR]

thank you, good excuse to go fishing, i need to conduct some tests.

[Big_Kev]

After reading the input I would be of the opinion that the transducer should be fitted where it works the best for you and that various positions may be required to get the best.
But I would now tend to install the tranducer firstly on the starboard side of a mono hull and lay the cable away from other electrical cable's??

[empty]

had 2 tranducers on 2 different boats ,both on port side and both havent work very well at speed ,might think about changing the 1 on this boat to starboard and se if it makes any difference

[FNQCairns]

Empty dont worry about moving it to the starboard side, you might try locating it deeper on the hull or anywhere on the same side that you could assume would introduce less bubbles captured by the hull and compressed along to exit at the rear.
How a prop can thrust forward half a foot and sideways as much as 2 or more feet as well as behind at any planing speed has me stuffed ???

[blaze]

my transducer is mounted about 10mm below the hull, people may say thie is too low but it is clean water and works, if the water is calm it works at 4okmh ok, not so if its choppy. I have had to fabricate a cover to stop the spray hitting the trim tab and sucking into the boat but it all seems to work ok
cheers
blaze