Tuesday, July 10, 2012

Radar Reflector for ‘Sandpiper’


‘Sandpiper’ at 14’ LOA is only a tiny boat. The likelihood of her being visible on a radar screen is minimal; nor will she be easily seen from the bridge of a ship by the duty watch officer. Her hull is blue and the top of her mainsail is blue; her cabin top is white. Therefore, she should be well camouflaged, which would be an advantage if she were on a ‘stealth’ mission, but a distinct disadvantage if she’s anywhere near a shipping lane. To make her more visible on radar I shall hoist a small tubular reflector that I occasionally used on ‘Ladybird’.

There are several types of radar reflectors, but I believe there are none more suitable for a small boat than the one I have. It has minmal windage, is light, and according to the manufacturer (Plastimo) it is effective. The dimensions are 58 centimetres by 5 centimetres, offering 2 square metres of reflective area! Probably the best place for deploying the reflector will be high up, attached to one of the shrouds.

On a couple of my previous yachts I have used the old-fashioned, aluminium octahedral reflector. This type when folded flat, takes up very little space, but when assembled it is too large for a small yacht. Windage for this type is high, and chafe on the sails is another problem.
Ecomax cylindrical reflectors are more efficient, because they have a large reflective area for their size; however, they are heavy - even the smallest weighs 1.4 kilograms, and I certainly do not want a 47.8 centimetre by 19.7 centimetre object near the top of the mast. At £116.94 from my local chandlery, the smallest Ecomax, inclusive of mounting brackets, is way too expensive.



Links

The Radar Reflector Site


My Old Mistress, ‘Ladybird’



4 comments:

Merlin said...

. . . . The Plastimo Compact cylindrical radar reflector is available on eBay for just under £24 in postage!

http://www.ebay.co.uk/itm/PLASTIMO-SAILBOAT-RADAR-REFLECTOR-YACHT-/140774666076

Full spec: http://www.plastimo.com/catalogue/productdetail.php?listnom=Man%20recognition|Visual%20recognition|Radar%20reflectors&ref=39099&LangID=1

Merlin said...

I've just purchased one for Molly!

Phil said...

Hi Bill, I was considering buying one like this for Ciao Bella for all the reasons that you have mentioned. While searching for a good deal I came across the QinetiQ report on radar reflectors following the Ouzo sinking. None of the passive type reflectors worked well however the cylindrical ones were singled out as inefficient. I now have an octahedral type which I can quickly hoist when in shipping areas or in poor visibility.
Worth looking up the report before deciding. Cheers Phil.

William Serjeant said...

Phil,

Thank you. I already have the one shown in the photo. Other types are not as handy for my small boat. If I find myself near a shipping lane, I'll deploy it anyway.

Cheers,
Bill.