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Radar Intallation - Pole Mount

Have a Catalina 36 and bought a Raymarine radar package. I would rather mount the radar on a stern pole such as a Garhauer rather than the mast since I can also use it as a outboard motor davit. Garhauer has a 6ft and and 8ft pole. Any recomendations? Will the 8ft "wip" too much? I do not need an extended range (6 miles at best).
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post #2 of 19 Old 06-13-2008
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Nunzio-

I would recommend the eight foot pole over the six, since you want to have the radome far enough up that it isn't "irradiating" the crew in the cockpit when in operation.

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Thanks,

I have heard that an 8ft may "wip" too much causing damage.
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Such poles are frequently braced with two short extensions running from the stern rail to a collar around the pole at the three foot mark. If this isn't enough, turnbuckled 1/4" stays from a collar higher up to toerail-mounted "chainplates" should do the trick.

A hint. If the pole isn't extendable like a vertical whisker pole, have the mounting end hinged so you can lower it into a dinghy to work on it. Also, the radome turns, and in turning, vibrates. Put a rubber ring to absorb the vibration at the bottom of the pole. See pole-mounted windvanes for ideas...basically the same set-up, only radomes are easier.
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A properly setup and installed radar post, even up to about 12' long is generally not going to cause too much "whip" if the pole is the right diameter, material and properly supported.

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post #6 of 19 Old 06-13-2008
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My dome..

Mine is an 8' pole starting about 3.5 feet above the water and I have no whip to speak of. The higher the better!

If I could easily switch to a mast mount instead of a stern pole I'd do it in a heart beat but then again I sail in pea soup often!!!

A dome 10' off the water will see a 10' tall target at about 7.6 miles.

A dome 20' off the water will see a 10' tall target at roughly 9.2 miles.

Most mast mounts are roughly 25 feet high or more!!

Never under estimate the distance you'll need. We have a ferry up here called the "Cat" that runs at over 50 knots. A 6nm dome visibility is NOT enough in pea soup for a vessel traveling 50+ knots trust me.... If you sail in shipping lanes you want distance if you don't it's not a big deal...


The higher the better!!!

P.S. Nunzio,

Please fill out your profile with your boat model and sailing waters. With a radar question it will greatly help others answer your question to know your sailing location. Radar questions dealing with Maine or the Canadian Maritime's will get decidedly different answers than someone on Albermarle sound or the Chess....

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Last edited by Maine Sail; 06-13-2008 at 02:15 PM.
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post #7 of 19 Old 06-13-2008
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I had an 8' SS pole fabricated and mounted on the transom for the radar and other assorted goodies. It is braced to the stern rail and there is absolutely no whip. Go with the 8, not the 6.
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One issue with having the radome too high is that you'll start to loose close range definition...which is a bit more necessary IMHO than something 30 miles away.

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Quote:
Originally Posted by sailingdog View Post
One issue with having the radome too high is that you'll start to loose close range definition...which is a bit more necessary IMHO than something 30 miles away.
Dawg,

I've heard you say this before and it's just not true in reality. I have owned three boats with mast mount and three with pole or low mounts and on every boat I can clearly make out all of my mooring neighbors who are less than 40 yards away. Even in a tight anchorage I can make out low to the water power boats at 30 yards. I have found NO USEFUL loss with a dome on the spar.. IF you need to see targets at less than 25 yards you're going to be in trouble either way...

Even with my spar mount on my Catalina 310 I could make out this neighbor, the C&C just behind my boat, clear as day and he has no reflector...

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Quote:
Originally Posted by sailingdog View Post
One issue with having the radome too high is that you'll start to loose close range definition...which is a bit more necessary IMHO than something 30 miles away.
SD,
I assume you're talking about mounting it on the mast vs 6 or 8 feet. 2 feet won't make any difference.
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