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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


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  #31  
Old 02-20-2014
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Re: Radar signature

Maybe you should concider your installation.. Mine is mounted at the spreaders and it picks up everything..My girlfreinds son is a Marine Helicopter Electronics engineer, and he was impressed! after he got done playing with it: I had to have him put it back, to my setting so I could use it! ..Dale
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  #32  
Old 02-20-2014
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Re: Radar signature

Quote:
Originally Posted by Lake Superior Sailor View Post
Maybe you should concider your installation.. Mine is mounted at the spreaders and it picks up everything..My girlfreinds son is a Marine Helicopter Electronics engineer, and he was impressed! after he got done playing with it: I had to have him put it back, to my setting so I could use it! ..Dale
Mine is slightly above the spreaders, as seen here: MarineTraffic

I pick up everything in flat water, but small things are confused with waves in any significant sea state.
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  #33  
Old 02-20-2014
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Re: Radar signature

Last two boats have put on gimbals just above storm jib set up. Found on prior boats with the relatively narrow beam width of enclosed dome radars heel does make a difference. With small boats to windward if beam doesn't hit them you don't see them. Also regardless of that the higher the dome the bigger the circle around your boat where you don't gets hits but the farther out you can see. I'm mostly worried about ships and use the thing to help navigate so want to see shore contours. Like it reasonably high up. Also like to see weather before it comes to me. Others may want it lower if concern is nearby 18' center consoles which have a poor return.
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Old 02-20-2014
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Re: Radar signature

The type of reflector with the planes intersecting at right angles (Davis) are best if used in the "catch rain" position but most seem too small to be useful as they are barely bigger than the wavelength being used. A bigger one would be hard to assemble and too heavy but should give much better performance.
So, there is at least one company selling one that is inflatable that seems to be large enough to be useful. Inflate and hoist when needed.
The size issue is why I devised my version made from silver coated ripstop nylon. At 16" diameter, it is considerably bigger than the 12" ones and is actually lighter. It is designed to sort of "pop" open out of its sack and is weighted to always be in optimal orientation. I put all this effort into developing the darn thing making at least 12 versions sewing them on my wife's machine, finally got one I really like and now find that I don't know anybody with a radar to test it.
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