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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics
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  #21  
Old 06-24-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

You hit the nail on the head - expectations! Those I have surveyed fall roughly into 2 camps. Those utilizing their first flapper valve feel that this unit is far superior to their experience with no flapper. Those who have the smaller diameter speed-only transducer with flapper are amazed that this design allows so much water in. Since I fall in the second camp my expectations have been challenged. I hope you got the chance to view my video. What would you think about sharing one of your thru-hull?
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Old 06-25-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Classic30,

One of the approaches I am considering is using GPS SOG data as you do. Has not knowing indicated boat speed or current conditions impacted you any in what you do?
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Old 06-25-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Unfortunately, the video on SA does not work for me. Do not have the necessary permission.
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  #24  
Old 06-25-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Be happy to send it to you directly if you're interested. Just PM me.
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Old 06-25-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Btw, what I ended up doing is varnishing all the wooden surfaces that are exposed to the salt water that sprays while changing the sensor. Purely cosmetic as teak isn't really going to mind.
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Old 06-26-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

I never would have thought that there are boat owners out there who regularly remove a transducer while their boat is in the water. have the same DST800. It has been in salt water for over four years. The only time it has tasted oxygen is the last haul/bottom job two years ago. It has never failed to work. Call me crazy but it seems like each time you open a hole in the bottom of your boat there is a potential for something very bad to happen. I would think the only reason you should remove it while the boat is in the water is if it stops working. You can clean any gunk or replace the paddle wheel. I am in the insurance claims business and this sounds suspiciously like the beginning of a loss report.

"I thought I'd make a video of how high the gusher is when I remove my speed transducer and..." Water cooler stories for weeks.

The flapper is a gimmick. I would never even think to trust it.
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Old 06-26-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

The height of the geyser will depend on how far under water the fitting is. I pull mine to haul and launch (sling straps are bad for the wheel) and there's a gush, but I either clap my hand on it or fit the other (plug/transducer) quickly, but it's only about 1.4' below waterline. If it was a deeper hull, there'd be more pressure. Still just a moments work to sponge out the gush.
Previous boat did not have a flap, but was even shallower, so water just sort of flowed out.
Just make sure you fit SOMETHING back in the hole as quickly as possible, flap or no flap.


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Old 06-26-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Quote:
Originally Posted by Whispering Wind View Post
Classic30,

One of the approaches I am considering is using GPS SOG data as you do. Has not knowing indicated boat speed or current conditions impacted you any in what you do?
WW, the sailing I do is on a large open "lake" (for want of a better description) with well-known (and relatively small) tidal runs. I guess I've not used boat-speed for so long now (a couple of years perhaps?) that I've got used to not having it. It would certainly be useful in some of our races, but then I'd be tracking the lifts/knocks by watching the speed indicator all the time, when I can get the same info quicker by watching the sails and the way the boat is tracking through the water. If, from the GPS track, I think there's a current pushing me sideways, a quick tack confirms it and tells me roughly how much...

So to answer your question, IMHO indicated boat-speed is a "nice to have", especially if you have wind-speed instrumentation (on my boat I don't) - but GPS SOG is good enough for me. At the end of the day, whether they be anchorages or racing marks, I'm still sailing from Point A to Point B and those are fixed points on the surface of the earth, not arbitrary points on the water.
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Last edited by Classic30; 06-26-2014 at 09:15 PM.
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Old 06-26-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

Im going sailing on Sunday weather permitting so will video the removal of the blanking plug to compare.

My issue isn't so much the quantum of water, more so it's the fact we have installed 3 of these and on all 3 the flap has fallen off shortly after relaunch. So either our installer is an idiot (I doubt that), or the product is defective.

Raymarine have not been very helpful to date. I emailed their warranty manager here in Australia about the latest failure on 12th of May, he indicated they needed to seek advise from the UK. I followed up on the 12th of June and have not had any response.
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Old 06-27-2014
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Re: Airmar / Raymarine DST800 Transducer Issue

My understanding is that Airmar is responsible for warranties on their equipment. My replacement thru-hull came from them (of course it performed no differently), so I would suspect that yours would too. My installer told me that the only way to prevent valve detachments is to lubricate the transducer and plug o-ring thoroughly and frequently. Something about dry o-rings gripping the flapper and pulling it loose from its hinge pin.

Hope you have a great sail on Sunday.
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