Deadrise for transducer PSC 34 1988 - SailNet Community
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post #1 of 7 Old 05-09-2019 Thread Starter
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Deadrise for transducer PSC 34 1988

Does anyone know the dead rise angle for the factory installed depth sounder?

I'm upgrading my electonics and will be installing a new depth transducer (Airmar B150 for Garmin 942). The old transducer is located under the nav station just forward of the aft water tank. My assumption is that this old Datamarine unit is original to the boat. I measure about a 20 degree dead rise at this location. Can anyone confirm this?

I also have a non functioning speed instrument (also old Datamarine) located up forward and I could locate the new transducer there but the dead rise seems more acute. I understand the advantages of locating the sounder forward but my current plan is to simply use the existing location for the new unit. Does anyone know the dead rise at this location?

I would welcome any advice. I did read through a few older threads. Thanks.
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post #2 of 7 Old 05-09-2019
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Re: Deadrise for transducer PSC 34 1988

I have two unused transducers mounted in the locker under the nav seat. I was quoted $800 each to remove them and repair the holes. I elected to leave them in place. Neither has a fairing block; both are installed flat with the hull. Under the plate in the cabin sole at the head door, I have an Airmar transducer (depth, speed, and temperature) installed vertical with Airmar fairing blocks. The signals from that sensor feed my Simrad instruments. On the outside the triducer exits the hull just aft of the leading edge if the keel protecting it from the Travelift slings when the boat is hauled.

Google Airmar fairing blocks.

Bill Murdoch
Irish Eyes
1988 PSC 34
https://irish-eyes-to-the-bahamas.blogspot.com/
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Re: Deadrise for transducer PSC 34 1988

We recently installed a new depth transducer on our PSC 37. It's located about a foot aft of the mast compression post/main bulkhead and off to the starboard side. This may be similar to the location of your speed transducer. We went with an Airmar transducer with a fairing block and it works great.
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Re: Deadrise for transducer PSC 34 1988

Hello,
In my PSc 34, the depth transducer is just forward of the stern fresh water (#2 tank). I too am planning on replacing it with an Airmar fishfinder/chartplotter transducer as the chip in the chartplotter shows depth and the new transducer will too. I don't like boring more holes in an otherwise perfect hull. I measured the deadrise at approx. 18 degrees with boat on cradle so I think it's as accurate as I need and Airmar didn't argue when I sent them the info. Good luck.
Khen on Kismet
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Re: Deadrise for transducer PSC 34 1988

Yes - that is about what I measured by eye with a level. I installed a Airmar B150 with a 20 degree tilt. Seem to work great. One question - did you measure the height from the bottom of the keel to the transducer? I actually forgot to do this when the boat was on the hard so when I went to calibrate the display of the depth on my Garmin chartplotter I was forced to guess. If you have that info that would be great. I have the standard keel.
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Re: Deadrise for transducer PSC 34 1988

Hi Jonah,
Well, it was one of those things I had written down to measure but the State Bird (the Greater Ubiquitous mosquito) here in Wi in the building my boat was in were so nasty I just wanted to get out of there....allergic to Deet, no smelly cigars around. I thought I would need it for "something" but in the end I had enuff info. BTW, I used a level and a bevel to measure it and did it 3 times so pretty sure it's close. Anyway, depending on the transducer, the cone of the transmitted wave should make up for a few degrees error, then there's the heeling aspect, etc., etc. Good luck, mon ami'
Khen on Kismet Hull 317
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Re: Deadrise for transducer PSC 34 1988

Every year with some regularity we run aground on sand. It is the perfect opportunity to calibrate the depth finder. If you have some trouble finding a suitable spot, come down to North Carolina. I can point out several.

Bill Murdoch
1988 PSC 34
Irish Eyes
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