I have a garmin 4208 chartplotter and want to install a thru hull transducer i'm not sure which one to buy they mention deadrise angle, any advice would help (I didnot call garmin) trying to avoid the hold time.. THANKS
deadrise angle?
- Thread starter Havana Shamrock
- Start date
Here's a crude explanation. Deadrise angle corresponds to the shape of your V-hull. When looking at the transom of your boat a lower angled (number in degrees) will give you a shallower and flatter V-hull design. A higher angled deadrise wil give you a deeper V-hull.
A hull with a bigger deadrise angle will slice through the chop and give a more comfortable ride in rougher water. The downside is the boat will have less lateral stability (it will rock more) and it's typically more of a "wetter" ride.
A hull with a bigger deadrise angle will slice through the chop and give a more comfortable ride in rougher water. The downside is the boat will have less lateral stability (it will rock more) and it's typically more of a "wetter" ride.
Alegria
Well-Known Member
I believe your deadrise is 21 degrees if that helps...
so as far as the transducer goes do i buy the 12/45 deg deadrise is that a safe operating range:huh:
On the 260 DA there is a flat spot indentation right on the keel for my transducer. I wonder if your boat has a similar mounting location?
I believe that without the Transducer shooting straight down, you will get depth readings that are greater than they should be. I don't how much of a deviation this can cause but I suspect that's why deadrise is brought up. My 260DA has a 23 degree deadrise so if the transducer was installed along the 23 degree hull surface itself on my boat the readings would probably be way off since the transducer would be shooting at an angle. I believe there are transducers that will also shoot thru the hull itself (without drilling a hole) so possibly that would be another choice.
Maybe someone else with a 320 can tell you if there is a spot on the keel for a transducer. If not, then I would call Garmin and ask them about it.
Dave
I believe that without the Transducer shooting straight down, you will get depth readings that are greater than they should be. I don't how much of a deviation this can cause but I suspect that's why deadrise is brought up. My 260DA has a 23 degree deadrise so if the transducer was installed along the 23 degree hull surface itself on my boat the readings would probably be way off since the transducer would be shooting at an angle. I believe there are transducers that will also shoot thru the hull itself (without drilling a hole) so possibly that would be another choice.
Maybe someone else with a 320 can tell you if there is a spot on the keel for a transducer. If not, then I would call Garmin and ask them about it.
Dave
- May 14, 2008
- 3,541
- Boat Info
- 1988 390 EC
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When I installed my Garmin 545s a few years back, The transducer housing had adjustments on it to compensate for the dead rise. This was for a through hull installation. It kept the transducer perpendicular to the water line.
tobnpr
New Member
Call Jim @ BOE. He'll set you up with the proper Airmar transducer you need. As stated above, they now have angled elements within the transducer to compensate for deadrise. Eliminates the old angled fairing blocks.
12/45 degree deadrise? The maximum deadrise on any hull I've ever seen built is 24 degrees- that is considered a true "Deep-V". The deadrise of the hull's entry could be 45 degrees, but that's not what we're talking about.
12/45 degree deadrise? The maximum deadrise on any hull I've ever seen built is 24 degrees- that is considered a true "Deep-V". The deadrise of the hull's entry could be 45 degrees, but that's not what we're talking about.
when i said 12/45 i was taking that info from the transducer details, ii aagree there is no 45 degree hull i'm not sure what the 45 means so i'll have to call jim thanks everyone
Westie
Active Member
- Oct 16, 2008
- 1,109
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- 2001 260 Sundancer towed with the power of an IFORCE V8
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the 12 / 45 angle you are referring to is the angle of the beam that transducer sends out at the two frequencies that it is operating at. It has nothing to do with deadrise.
yeah i'm starting to get it now, i see the transducers also come pre (angled) so there no need for a fairing block , i'm learning ,:smt038
almostenuff
Member
- Sep 18, 2010
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- 2005 Sea Ray 390 Sundancer
2002 SeaSwirl 2301 WA
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F225 Yamaha
I'm installing a new Raymarine ST60 in place of the stock Lowrance depth finder. I hope that I can pull out the old transducer and slip in the new one. Anyone done this? Any gotchas or tips? Where is the OEM transducer located (haven't been in the bilge yet to find it). Thanks!
