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post #11 of Old 09-03-2012 Thread Starter
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Re: Remove (trilens) radar reflector from mast?

Originally Posted by ParadiseParrot View Post

beth and evans discussion of above.

Practical boat owner magizine discussing FAIL.

Ouzo report: Radar reflectors fail test | News | Pbo

USSSAILING,,,,,,,Passive's FAIL....

only active reflector showed any use.

Given how and when large ships use radar Passive radar reflector have only psychological use.If it make you feel good then fly one but the OP's installation is causing more harm to his safety than a reflector could add to it.

Your own radar with AIS is the way to go....Active reflectors seem to work reasonably well but for there cost and power use i would just my own radar.

Several studies where undertaken by independent agencies because of rundown incidents with large shipping. The results are all more or less the same.
The first two sources are from the 1995 report that is also referred to by Practical Sailor. At that time, the Trilens reflector did not exist.

The other two are from the Ouzo accident investigation in 2007. The conclusion is that none of the passive reflectors can achieve the 10m^2 criterion. The large Trilens has the second best RCS of all passive reflectors, after the Polaref whose price-point (2000.- British pounds) gives some pause. Predictibly, RCS of the the smaller Trilens is considerably lower but it still outperforms all passive reflectors except the large Trilens and the Polarref for healing angles exceeding 15degrees (which of course is of great interest for sailling vessels). As a side note, the Davis is the worst of the octahedrals.

I agree with your conclusion that active radar plus AIS is best. If this is not in the cards, and neither is a $4000.- passive reflector, then these reports, in agreement with the Practical Sailor study that I cited, all agree that the Trilens is the best solution.
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