Russ Hauser
Tavares, FL
Boat Name: Serenity Now!
Model/Year: 1982
Hull No. CTYH1337M82L
Hailing Port: Lake Harris |
 04/25/2007 1:26 PM Pacific Time
I have a Raymarine ST40 speed log and want to be sure I know the best position for the transponder before I bore a 2 inch hole thru the bottom of the boat. My boat is a 1982 and I plan to place the transponder near the aft bulkhead in the aft storage compartment under the "V" berth. The transponder will be to the Starboard, about 2 or 3 inches off the center. Does anyone find fault with this installation? |
Pat Lindsay
Huntsville, AL
Boat Name: Stargazer
Model/Year: 1983
Hull No. 11735
Hailing Port: Lake Guntersville, Al |
05/12/2008 7:17 PM Pacific Time
I realize it's been over a year since you asked this question, Russ? I have the same question. Also, is it better to place the transducer forward of the keel or maybe behind the cable, half way to the transom? Third, has anyone tried mounting a knot meter on the transom, near the centerline? |
Bob Conway
Huber Heights, Ohio
Boat Name: Spindrift
Model/Year: C22/1979
Hull No. #8717
Hailing Port: Buck Creek, Ohio |
05/13/2008 8:03 AM Pacific Time
I don't have a knot meter, but a friend does who I sailed with in the North Channel. When I read your question it made me think of where his knot meter is and now, why he may have placed it there. His is on the transom, just to one side of the rudder. At this location, he can climb down his ladder, also mounted on the transom, and easily clean the propeller on the meter. I didn't much about it at the time, but now I see the advantage.
Bob |
David Torrisi
Santa Clara, CA
Boat Name: Dumbo
Model/Year: 1975 C-22
Hull No. 4330
Hailing Port: Santa Clara |
05/13/2008 8:39 AM Pacific Time
There's less disturbed flow just forward of the keel and that's where I've seen most paddle wheel types installed. FWIW, a GPS is a good choice for knowing speed, etc. and no holes in the hull required!
David |
Pat Lindsay
Huntsville, AL
Boat Name: Stargazer
Model/Year: 1983
Hull No. 11735
Hailing Port: Lake Guntersville, Al |
05/20/2008 10:35 PM Pacific Time
Thanks for your comments, guys. I'm still thinking I might put it at the transom since I hate drilling holes in the boat below the waterline. However, if I decide to drill forward of the keel, will the signals from my knot meter and depth gauge (also mounted there) interfere with each other? On the other hand, a buddy of mine mounted his about 2 ft. forward of the transom, and he gets a pretty accurate and consistent speed readings. How do you think placing the speedo there would work? I'm not a C22 rock-star, so perfection is not my goal. But I do want to get the most speed out of the boat that I can. Any parting thoughts before I fire up the drill? |
David Torrisi
Santa Clara, CA
Boat Name: Dumbo
Model/Year: 1975 C-22
Hull No. 4330
Hailing Port: Santa Clara |
05/21/2008 9:39 AM Pacific Time
Don't forget to consider launching and retrieving when deciding where to put the sender. It shouldn't interfere with your depth sounder, but you may want to verify with the mfrs. If you trailer, consider the bunks and if you haul out at a yard, consider the slings. I'd still opt for a gps solutions as you get more info for the same money and no holes to drill, but that's just my opinion. Good luck!
David |
Pat Noonan
Fairhope, Al
Boat Name: Blue Dog
Model/Year: ?
Hull No. ?
Hailing Port: Fairhope, Al |
10/05/2008 3:44 AM Pacific Time
DON'T bore a hole. mount the transducer inside the boat beded in silicone. Use a toilet bowl wax ring to make a dam, sand a bit of the fiberglass to get a grip and then add a bit of silicone, place the "puck" and fill with silicone. Works a lot better and you don't have to worry about sanding off the face when you do the bottom. Best part is nooooo hole in the boat. ps if you don't like the placement....voila, change it with no problem. |
Bilbo
Youngstown, Ohio
Boat Name: Sea Dog
Model/Year: Catalina 22 1987
Hull No. 13971
Hailing Port: Andover, Ohio |
10/14/2008 4:00 AM Pacific Time
I believe that this transducer needs to have a hole as it is a thru-hull type. THey also make a transom mount version.
According to Raymarine's instruction manual:
The transducer should:
• Be ahead of the propellers (by a minimum of 10% of the water line
length ).
• Be at least 150 mm (6 in) away from the keel (ideally ahead of the
keel if a sailing yacht).
• Be as near as possible to the centre line of the vessel.
• Be clear of other through-hull fittings or projections.
• Have sufficient clearance inside the hull to fit the nut.
• Have 100 mm (4 in) of headroom to allow for withdrawal.
The transducer should be sited within the clear water flow areas
indicated by the shaded areas in the following diagram. (The diagram shows three applications. On the sailboat version, the transducer is located a short distance in front of the keel. On the outboard motorboat version, it is about 1/4 of the way in front of the transom/outboards.)
more:
http://www.raymarine.com/default.aspx?site=1§ion=2&page=1881 |
Pat Lindsay
Huntsville, AL
Boat Name: Stargazer
Model/Year: 1983
Hull No. 11735
Hailing Port: Lake Guntersville, Al |
10/20/2008 3:35 PM Pacific Time
Guys,
I bit the bullet and drilled the 2" hole into the bottom of my boat, ahead of the keel. It actually turned to be fairly easy to do, and chamfering the hole to match the bevel of the thru-hull was also fairly easy to do with a small rasp. I bedded the thru-hull using 3M 4200 and tested it with a pressure hose the following day. I haven't launched yet since I'm still working on my keel, but I'll report the knotmeter's performance when I finally get the boat back into the water. |
