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Old 12 May 2007, 17:12   #1
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Radar Deflectors

Although this does not come under electronics I thought that I should post it here.
Well what I discovered about these things.
IMHO they do nothing on a boat.

The experiment
I have put up a radar JRC radar on my boat. We scanned the RIB of a friend without a radar deflector and while on its side where it had no metal surfaces to deflect the radar beam the radar showed nothing. As soon as the rib showed the back and the metal of the engine deflected to the radar the RIB was shown clearly. We then mounted my radar deflector on my friends RIB. The deflector was mounted on the A frame. What we observed was the same as above.

Our conclusion if you do not have any type of metal on the side of the boat or if the radar deflector is mounted up high like on the yachts) it offerer no real assistance and ships or any other craft that have radar will not locate you unless on each of the sides of the boat there is a metal surface.

I'm not sure whether you agree or not, but I think that it will be helpful to hear some other views on this matter.
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Old 12 May 2007, 17:48   #2
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Quote:
Originally Posted by Manos View Post
Although this does not come under electronics I thought that I should post it here.
Well what I discovered about these things.
IMHO they do nothing on a boat.

The experiment
I have put up a radar JRC radar on my boat. We scanned the RIB of a friend without a radar deflector and while on its side where it had no metal surfaces to deflect the radar beam the radar showed nothing. As soon as the rib showed the back and the metal of the engine deflected to the radar the RIB was shown clearly. We then mounted my radar deflector on my friends RIB. The deflector was mounted on the A frame. What we observed was the same as above.

Our conclusion if you do not have any type of metal on the side of the boat or if the radar deflector is mounted up high like on the yachts) it offerer no real assistance and ships or any other craft that have radar will not locate you unless on each of the sides of the boat there is a metal surface.

I'm not sure whether you agree or not, but I think that it will be helpful to hear some other views on this matter.
Try here: http://rib.net/forum/showthread.php?t=19213&page=3 or search this site for radar reflector rather than deflector.
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Old 12 May 2007, 17:53   #3
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Thank you for pointing this out
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Old 12 May 2007, 17:58   #4
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Manos if you have a RADAR deflector you could make a fortune - STEALTH RIBs!!!
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Old 12 May 2007, 18:03   #5
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..... yes cod ..... why don't you take the mickey?
Deflector ... reflector ... I'm confused .... and I'm still sober
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Old 12 May 2007, 18:20   #6
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..... yes cod ..... why don't you take the mickey?
Deflector ... reflector ... I'm confused .... and I'm still sober
Who moi???

As if..........
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Old 12 May 2007, 19:28   #7
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Deflector ... reflector ... I'm confused .... and I'm still sober

Thats what Gloucestershire does to you... Go sit on a tump for a whoile and clear yer 'ead
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Old 13 May 2007, 05:31   #8
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Quote:
Originally Posted by Manos View Post
Although this does not come under electronics I thought that I should post it here.
Well what I discovered about these things.
IMHO they do nothing on a boat.

The experiment
I have put up a radar JRC radar on my boat. We scanned the RIB of a friend without a radar deflector and while on its side where it had no metal surfaces to deflect the radar beam the radar showed nothing. As soon as the rib showed the back and the metal of the engine deflected to the radar the RIB was shown clearly. We then mounted my radar deflector on my friends RIB. The deflector was mounted on the A frame. What we observed was the same as above.

Our conclusion if you do not have any type of metal on the side of the boat or if the radar deflector is mounted up high like on the yachts) it offerer no real assistance and ships or any other craft that have radar will not locate you unless on each of the sides of the boat there is a metal surface.

I'm not sure whether you agree or not, but I think that it will be helpful to hear some other views on this matter.
Perhaps you would like to inform the International Maritime Organisation, MCA, US Coastguard, Defence Evaluation & Research Agency, Nautical Institute, and the many others who have conducted benchmarked auditable trials and come to the opposite conclusion, before you start putting people off fitting important safety aids.

Simon
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Old 13 May 2007, 05:55   #9
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Perhaps you would like to inform the International Maritime Organisation, MCA, US Coastguard, Defence Evaluation & Research Agency, Nautical Institute, and the many others who have conducted benchmarked auditable trials and come to the opposite conclusion, before you start putting people off fitting important safety aids.

Simon
But they haven't come to different conclusions - read this: http://www.maib.gov.uk/cms_resources...s%20report.pdf

to paraphrase - "cheap radar reflectors are crap" or slightly more technically: low cost, entry level radar reflectors may not significantly increase radar cross section except at specific angles of approach...
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Old 13 May 2007, 07:31   #10
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And it's worse than may be apparent because the radar scanner is rotating and the reflector will need to be in its effective position just when the scanner is aligned with it. It will have to do this through a number of scans for the radar to show the reflector as a permanent target on the screen. Given the nature of the sea, it's not very likely. Having said all this, I find radar particularly useful because it frequently shows me targets before I see them visually so something must be reflecting effectively from these vessels.
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