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Transducer location

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Old Salt

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" My boat is a 1976 Trojan, F2

" My boat is a 1976 Trojan, F26 hardtop with a single inboard engine,
I have had trouble with my stem mount thru hull transducer for my fish finder.
I am thinking of mounting it inside of the hull.
Could anyone out there give me an idea as to a good location for its mounting.
Thank you. "
 
" Read the directions, but usu

" Read the directions, but usually they are mounted off centerline and ahead of shafts. rudders, etc, so as not to pick up prop turburlance. Kim "
 
" Kim
Thank you for the reply

" Kim
Thank you for the reply.
According to the directions it is mounted in the correct location, 20in port of center line and 7ft from stern.
It will only track bottom upto 10 mph, above that the signal breaks up.
This is why i am looking for a better location.
I have installed transducers on other boats i have owned and never had this problem.
Any and all recommendations would be greatly appreciated. "
 
" Old Salt, you are probably p

" Old Salt, you are probably picking up turburlance(sp?) so try to look at bottom of boat and see if anything is there to cause it. Could be design of hull or a thru hull etc. May have to move it slightly to outboard to get away from keel wake. Seems mine is about 24" from outer edge of keel. Also check for goop on bottom of boat. Good luck and keep me posted. We love happy endings esp in the boating world. Kim "
 
I have a 25ft fiberglass Chri

I have a 25ft fiberglass Chris Craft single inboard. Mine is shooting thru the hull from the center of the hull just ahead of the engine. I do not have a keel to interfere with the signal. The idea is to mount it so that it is looking at green water under the bottom without air or bubbles regardless of speed. White water and air bubbles cause signal loss.
 
" Kim
I get the impression th

" Kim
I get the impression that you are familiar with the trojan hull.
Do you own a trojan?
You mentioned the keel and keel wake.
This is the first time i have heard of keel wake.
This may very well be the problem, as the area ahead of the transducer is clear and clean.
You said your transducer was mounted about 24in from keel.
Could you tell me how far yours is from the stern, port or starbord?
Right now my boat is in dry storage,as soon as the weather breaks an the storage facility finishes their upgrade i will be able to go back into the water.
Thanks.
Old Salt "
 
" Old Salt, Not familiar with

" Old Salt, Not familiar with the Trojan hull but it cant be much different from most if it has a keel. I did struggle with my hull and transducer location and finally called Hummingbird and spoke to a real person in tech. He said in rare instances, keel turbulance can cause artifacts.So in this less than perfect world the transducer needs to be close enought to center line yet far enough away to avoid turbulance. Hmmm.... Question? does your transducer mount thru hull or is it pasted to inside of glass? Some glass hulls have metal strips laid up in them for bonding purposes and you may have it over on of those. My boat has an aluminum hull so I use a thru hull with a HDEP insert to keep the bronze from the alum. As far as location from stern I would guess it is slightly aft of amidships and like I said about 22-24" from centerline of keel. That would put it about 36" in from port side of boat. Keep in touch and hope for fair weather. Kim "
 
Kim
The trojan hull has a 4i

Kim
The trojan hull has a 4in wide keel that starts at the bow and runs back to a point just ahead of the shaft. At the lowest point it is 8in deep.
My transducer is mounted 18in to port and 2ft fordawd of the aft end of the keel. it is mounted thru the hull on a fairing block. The miniun depth below the hull is 2.5in inside to the face of the transducer.
The beam is 10ft 2in with a Modest "V"
Old Salt
 
" old salt, I have a 78 F26 th

" old salt, I have a 78 F26 that I just installed a thru-hull. first it should be on the side of the hull that the prop's downward stroke is on, that is on a right hand engine mount it on the starboard side. On that hull there is two lifting strakes on each side that end about 1/3 aft of the bow, get the transducer near the keel to keep out of that turbulance. "
 
" Need to change my transducer

" Need to change my transducer (brass thru hull) and want to know:
1. are transducers (brass thru hull) standard size

2. if so, should I attempt to replace while in water (40 foot silverton). New at boating and some say it is easy. My boat is in 16 foot of water. "
 
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