Reply
 
Thread Tools Search this Thread
 
Old 23 October 2004, 11:35   #41
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,894
RIBase
No Progress?

Quote:
Originally Posted by codprawn
It is strange to think that RADAR hasn't really advanced that much since the magnetron was invented during the war - alright the displays are better and much smaller but power/range etc are still the same - also the skill required hasn't really changed that much!!! Electronics can only do so much.
Yeah, it's a shame about that. If only the earth were flat we would be able to see much further with our radars. There must be a way to see over the horizon?
__________________

__________________
Searider is offline   Reply With Quote
Old 23 October 2004, 13:34   #42
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by Searider
Yeah, it's a shame about that. If only the earth were flat we would be able to see much further with our radars. There must be a way to see over the horizon?

I take it that is a tongue in cheek comment about "over the horizon" radar? Funnily enough during the early Radar days the biggest problem WAS "over the horizon" - they had to work very hard to cut out confusing returns from objects too far away!

Nowadays all the research is back onto "over the horizon" stuff!
__________________

__________________
codprawn is offline   Reply With Quote
Old 24 October 2004, 05:48   #43
RIBnet supporter
 
Brian's Avatar
 
Country: UK - Isle of Man
Town: Peel, IOM
Length: no boat
Join Date: Nov 2000
Posts: 2,277
RIBase
OK then, with the few brain cells I have left, what about a comment from someone on "visibility".
We have had lots of postings in the past about the effectiveness of RADAR reflectors.
My own experience, with my RADAR, is that these reflectors are all pretty hopeless at picking up small boats like RIBs. I usually cant "see" the other boats in my little flotilla, either at all or at best, not very well.
My question is, are they really useless or is it my kit/ability to read the screen properly. I have always assumed that big ships, helicopters and SAR craft, the military etc. are fitted with much better kit/properly trained people and can indeed "see" us. Can any "Mike Uniform" type or SAR guy or Naval person comment on this? Conspicuous silence when this question has been asked before.
__________________
Brian is offline   Reply With Quote
Old 24 October 2004, 06:28   #44
Member
 
Country: UK - England
Town: Torquay
Make: Bayliner
Length: 5m +
Engine: I/B 3L
Join Date: May 2004
Posts: 395
I was advised to not to bother carrying a bought radar reflector
Quote "cause they are crap" I won't say who quoted it to me just in case
but to use a home made one from a black bin liner fill of scrunched up tin foil.

Sounds like a good idea but hope I never have to find out if it works
__________________
TQBoater is offline   Reply With Quote
Old 24 October 2004, 06:34   #45
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
I sat in on a Radar reflector test a few years ago - the findings were that it has a lot to do with the way the reflector is mounted - they DO help but not much - obviously the higher above the water the better - bit different on a yachts mast compared to a RIB.

One thing that was noticed in the test was that some boats without reflectors returned bigger returns than other boats with them - so many factors to take into account.

Remember a RIB is probably the worst thing you could have for being picked up on RADAR - low in the water - made of absorbant materials etc. Which is why drug runners love them!!!

The best bet for a RIB would be an active system - possibly something like the following

http://www.sea-me.co.uk/index.html

It re transmits the radar signal and also tells you when it has had a paint(signal)which is quite usefull.

Tests on radar reflectors can often be misleading - often the angle is very crucila - a reflector that gives a huge return on certain occasions can be all but invisible on others - bit like shining a laser pointer at someone.

This test looks ok but they all seem to favour yachts - a RIB is a bit different!!!

http://www.ussailing.org/safety/Stud...nd%20Emergency
__________________
codprawn is offline   Reply With Quote
Old 24 October 2004, 06:50   #46
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
http://www.powerandmotoryacht.com/el...cs/index1.html

Just spotted this - the Cyclops is also worth a mention - not so good in many tests because of it being mounted on a yacht - they don't like to be heeled but could well be ideal on a RIB - apparently Mr Priddy uses one!!!

They look really cool as well.

http://www.oceannavigator.com/site/c...ent.asp?id=671

This article explains things really well.
__________________

__________________
codprawn is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 13:39.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.