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Nasa Target Log

7331 Views 8 Replies 5 Participants Last post by  bartvdv, 
B
The knowledge in this forum is my last resort....

I have a NASA Target log o/b.
When I start it up it shows 0.1 knots, then 0.0 knots. (so far so good)
If the boat moves through the water it always shows 0 knots.

I pulled the paddlewheel out and checked it.
It was ok, paddle moved freely like it should.
When I manually move the paddlewheel, correct readings come up the screen.

So, the system works like it should, but when the sensor is inserted, it won't work!

Also, i tired to clean the hole from the outside with a hose, a brush,....

The log is placed on a place with a normal, unobstructed, laminair flow.

Does anyone know the golden tip to help me?
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Make sure the transducer is correctly inserted. Has it tripped all the way down ? check manual and make a visual inspection. It might get fouled on its end near water, or entered some clogging dirt. Otherwise prepare for a dive, and soon before water gets cooler ... having someone looking to the display, dive under boat and try it by hand. Also a good mask will help you determine what's going on and a fix.
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Was it working before ? Seems not in a good place. Underwater, did you feel the placement is correct, I mean, is it showing a good blade face to the laminar flux ? Turbulence ? Very difficult without visual inspection. I hate those paddles transducer so I use 99% of time SOG from GPS. I do install mine only when doing a long trip. OK, next life, move to southamerica .... :)
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