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The Cone of Silence raised

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Where To Mount A Radome For Best Performance

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No matter how big, how powerful, or how expensive your radar is, its performance may be limited by the way you mount the antenna.

Bayliss powerboat

Most fast powerboats run with a slight bow-up angle, which can be compensated for by placing a wedge under the dome or array during installation. In the case of some custom or semi-custom boats, this angle may already be built into the radar-mounting platform.

The radome or open-array antenna sitting atop your boat is your radar's eyes and ears, and like the eyes and ears upon your own head, the way it's situated can make a world of difference in what it sees and hears. When it comes to radar, of course, the way it sees is the way it hears. Think of your radar antenna as a loudspeaker and microphone, all in one. The loudspeaker shouts — with a microwave pulse — and the antenna listens for an echo. Then the processor crunches a few numbers and, voila, a blip appears on your screen.

Simrad radome

Broadband radar uses a lower-powered continuous wave transmission instead of a magnetron pulse, producing exceptional target resolution close to the boat.

The radar antennas on most boats today transmit microwave pulses with a magnetron, then listen for those reflections that bounce back from solid targets. A mathematical calculation using the amount of time the pulse takes to be reflected determines the exact distance to the target. The latest technology, Broadband radar, broadcasts a continuous transmission wave that increases in frequency as it moves away from the radome, hits a target, and is reflected back. The unit's brain then uses the difference between frequencies of the transmitted and returned waves to determine target distance.

Walking Tall

When it comes to mounting a radar antenna, higher is better, to a point (see sidebar). First off, getting the dome above head level is a must because you don't want to bake yourself and your crew with microwave pulses every time you use the radar. (This is less of an issue with Broadband, which emits a much lower burst of power.) Beyond the safety concerns, height is important because the biggest limiting factor relating to radar's performance is the Earth's curvature. Those microwave beams can't be bent to follow that curvature, so the height of your radar antennas and the height of the target you're looking for will always limit the distance your radar can see. Ready for some basic math?

(1.22NM x square root of the Height of Target) + (1.22NM x square root of the Height of Radar Antenna) = range

For example, a radome mounted 12 feet off the water might first spot a small powerboat, with a maximum height of 9 feet, at a distance of just under 8 nautical miles. No matter how big and powerful your radar may be, no matter how much it cost, you can never expect it to see beyond that. Nor will it commonly see all the way out to this range; this is merely the maximum you can hope for. Target shape and density, atmospheric conditions, and other variables usually will have an effect on range as well.

Sailboaters have a natural advantage regarding height because they have a tall mast to work with. But in some cases, back-stay or post-mounting options make more sense. This is a judgment call: Is it more important to you to gain range, or to have easy access to the radar antenna? Do you need to use the radar often when heeling? If so, you need a mount that matches your needs, and this may affect whether you use the mast or go a different route (see below).

Higher Is Not Always Better

On a sailboat, the greater range of a radar mounted on the mast must be weighed against these advantages of mounting it lower:

  • The scanner is less vulnerable to damage from an errant halyard or sail.
  • The "cone of silence" is reduced so that targets close to the boat can still be "seen" by the radar.
  • The motion in a seaway is reduced, enhancing radar accuracy.
  • The radar is easier to service.

Powerboaters, on the other hand, may need to add a mast or pedestal to gain elevation if they want to maximize range. How much is necessary? The above equation holds the answer, but for those of us who aren't math whizzes, let's use the example of a 35-foot cruiser with a hardtop that's elevated 10 feet over the water.

Never cut the plug off a radar cable during installation. Damaging the cable's shielding will reduce the radar's performance.

If you mount the radome right on that hardtop, you'll be able to see a 300-foot-tall building or water tower on shore from just over 25 miles off. You'd see a 100-foot-tall freighter at around 16 miles. And you'd see other boats of the same size as yours at around 8 miles. Raising the dome 10 feet above the hardtop on a mast does add range; however, not as much as you'd think. That tall building might now be visible at just over 26 miles. The freighter could appear onscreen at 18 miles. And a boat like yours would come into radar range at around 9 miles. So is an extra nautical mile of collision warning worth it?

Radome mounted

The first consideration in mounting a radome is to get it above the heads of the crew to avoid blasting them with microwave energy.

Given that a boat traveling at, say, 30 nautical miles per hour takes two minutes to traverse that mile or, worst case, two boats of similar size and speed headed directly at each other take one minute to close that gap, you may decide the answer is no. You'll have to decide exactly how much range is enough, and how much height is therefore enough. Remember, radar is most often needed for collision avoidance, when visibility is restricted. For radar to operate well in close, how you mount your radome matters.

Visual Acuity

Remember the "cone of silence" from the TV show, "Get Smart" ? Radar suffers from its own cone of silence, which is affected by the angle at which your antenna is mounted. Once you know how high you'll mount your antenna, you need to determine the angle at which you'll mount it. There's another big difference here between sailboats and powerboats. Most modern planing powerboats run with a bow-up attitude while sailboats cruise at a more or less flat angle. Sailors (and owners of displacement powerboats) can skip this part and simply mount the dome at zero degrees.

The rest of us will want to pick up a clinometer (an inclination meter), which will tell you the angle at which your boat runs. These cost less than $20, can be found at any West Marine, and are used by sailors to determine angle of heel. You can also get an app for Android and iPhone smartphones for a couple of dollars that will do this accurately. Even though you should travel slowly in poor visibility, and therefore off plane, this angle may still have a noticeable effect on radar performance and it's worth figuring out what it is.

Radar antennas come in both small, closed-arrays (radome) or larger open-arrays. Larger open-arrays give better target discrimination.

Powerboaters will orient the clinometers fore and aft in the boat, making sure it reads zero while the boat is at rest, then run the boat at a moderate cruising speed, on calm water. The clinometer will tell you the running angle of your boat, which is usually somewhere between three and six degrees. Now you know what angle wedge you'll need to keep that radar antenna at the ideal angle when you're running. Note, in the case of some large boats and custom-built boats, the manufacturer may predetermine the mounting angle and build it right into the hardtop or mounting area.

These few degrees may not seem like a big deal, but radar beams are functionally narrow, vertically, offering around 25 degrees (12.5 degrees above and below the centerline) of effectiveness. Not correcting for your boat's running angle can leave a large area around your boat uncovered, the cone of silence. At the same time, the narrow angle of the beam means mounting your radome way up the mast of a sailboat can have a similar effect, putting targets close to the boat "under" the radar and rendering them "invisible."

Sailboaters have another issue to address, as their boats tend to heel for long periods of time. When a sailboat's heeling, the leeward side sees a reduction in range and on the windward side, close-in targets may be missed in some of the unit's sweeps. The best solution is putting the antenna on a gimballed mount, which stays level as the boat heels. The downside to this solution is expense — a good gimballed mount can cost as much as some inexpensive radar units. Another option is to mount the dome in such a way that it can be adjusted for heel on the fly. Some mounts have a manual clamp, but these don't do you any good if your antenna is mounted out of reach. If it's too high up on the mast for manual adjustment, you can also mount an electric-leveling device (essentially a trim tab) athwartship under the radar antenna and use it to level out the heel when necessary.

When post-mounting, if possible mount the radome on the boat's starboard side. Masts, rigging, and gear are bound to cause some shadowing (blockage of the radar's signals). Boats to starboard are most often the stand-on vessel; therefore maximizing the radar's view in this direction makes sense.

Wired For Success

Let's say you've decided on the best mounting option for you and your boat. The next question is, who will mount that antenna? This is a fairly easy project that most competent DIY mariners can handle. But a few cautions are in order because the most common radar installation problem is cable failure. And often, that failure results from the installation job.

Don't try to cut the plug end off a radar antenna cable and think you'll be able to splice it back together properly, and don't stress a wire while pulling it through pipe work or a chase. If the shielding of a radar antenna cable takes even minor damage, saltwater may intrude and eat the cable from the inside out. In fact, protecting the radar antenna's cable should be considered a top priority. Treat it gently during installation, and make sure it's supported with cushioned clamps.

If you have any doubts about your ability to install the antenna and cable, don't attempt it. You can always go to an NMEA-certified electronics installer and have confidence that the job will be done right. Remember, that radar is an important tool in your arsenal of safety gear, and you need its eyes and ears to be as sharp as possible.

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Hyde Sails SIBS 2024

The Cone breaks Silence

cone of silence sailboat

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cone of silence sailboat

THE CONE OF SILENCE

Boat Type:

Sail

Hailing Port:

BOSTON, MA

Official Number:

1187234

Hull Number:

WWA117665DZ2

Hull Length:

31.4 feet ( 9.6 meters )

Hull Breadth:

11.1 feet ( 3.4 meters )

Hull Depth:

8.2 feet ( 2.5 meters )

Gross Tonnage:

10

Net Tonnage:

9

builder:

Hull Material:

Other

Hull Shape:

Sail (Faired Keel)

Sailing Category:

cruiser/racer

Displacement To LWL:

243

Hull Speed:

7 Knots ( 8.1 miles/hour, 13 km/hour )

LWL To Beam:

2.5

Motion Comfort:

17.6

Capsize Ratio:

2.2

Pounds per Inch Immersion:

1083

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Yachting Journal

Noakes Sydney Gold Coast Yacht Race 2024

The cone of silence.

The Cone of Silence

Competitor Details

Yacht Name The Cone of Silence
Sail Number 8699
Owner James & Jenny Neill
Skipper James Neill
Crew M Blaxell, E Cox, C Malcolm, M Mathews, J Van Roon, R Miller, I Miller.
State NSW
Club RPAYC
Type Super 30
Designer Reichel Pugh
Builder Brenmark Industry
Construction Carbon
LOA 9.6
Beam 3.45
Draft 3.45
  • Line Honours

Full Standings available approximately three hours after the start.

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cone of silence sailboat

Cone of Silence

Country: USA
Builder: Brenmark Industries
Length: 30'
Type: Racer

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  • Data Updated on 11/9/2017

THE CONE OF SILENCE Vessel Information


Download all available information for THE CONE OF SILENCE to a formatted spreadsheet or other file type
(Managing owner of the vessel) (available with or
)
(Address the US Coast Guard has on file for this vessel) (available with or
)
(A unique 12 digit alpha-numeric identification number that all boats manufactured after 1972 are equipped with on their transom (the flat rear end of the boat) and reflects the manufacturer, serial number, and month and year of build) (available with or
)
(Displayed on the vessel's stern and may be used to best determine the vessel's geographical area of operation) (available with or
)
(This is a unique number that is assigned by Lloyd's Registry for the life of the vessel. Most vessels with this number are self propelled, over 100 gross tons, and operate on ocean and/or coastwise waters.) n/r
(Unique code designated for the vessel's radio transmissions) n/r
(Unique ID awarded by the U.S. Coast Guard to a documented vessel and is permanently marked on some structural part of the hull interior but not to be confused with the manufacturer's hull identification number.) 1187234
 (United States)
(General use of the vessel) Recreational
31.3999 ft
10
9
n/r
n/r
(e.g. Monohull, Trimaran, Catamaran, Unknown) Sail (Faired Keel)
UNSPECIFIED

Download all available information for this vessel to a formatted spreadsheet or other file type

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  • Humminbird Side Imaging Forums »
  • General »
  • General Discussion »
  • Topic: SI imaging cone of silence
]    Topic: SI imaging cone of silence  (Read 16091 times)

0 Members and 1 Guest are viewing this topic.

February 06, 2010, 02:39:04 PM » --> February 06, 2010, 02:45:27 PM »
(18.14 kB, 800x541 - viewed 958 times.)
February 06, 2010, 02:48:00 PM »
(38.95 kB, 800x541 - viewed 930 times.)
February 06, 2010, 02:50:28 PM »
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February 06, 2010, 03:09:34 PM »

hendrik (who quickly took his 1197 out of the boat  and put it into his bed to get warm again)

February 06, 2010, 03:19:07 PM » February 06, 2010, 05:07:45 PM » February 06, 2010, 05:51:18 PM »

This is a link to a discussion on another board about the coverage of downimaging but it discusses the use of the SI information used in creating the DI.  According to this theory there is no gap in coverage below the boat and the lost four degrees are near the surface.  From my observations of objects appearing on both sides of the SI this seems to be correct.  But then I have been wrong many times in the past February 06, 2010, 06:37:21 PM » February 06, 2010, 09:49:46 PM » February 07, 2010, 10:54:04 AM » February 07, 2010, 01:13:05 PM » May 21, 2010, 11:12:05 AM »
(15.45 kB, 640x400 - viewed 848 times.)

(26.22 kB, 640x400 - viewed 594 times.)
» May 21, 2010, 03:28:00 PM »
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» May 21, 2010, 08:30:20 PM » March 14, 2011, 07:03:11 AM »
That is to say if the cover is 90 degrees there is no dead zone anymore...true? March 19, 2011, 07:17:24 PM » » March 20, 2011, 04:00:16 AM »

We are 26 m of depth, the road on the bridge is 20 m and  boat passed straight in vertical of the bridge. This bridge get three arches we do not see as the vertical is perfect and the depth moderate (therefore not enough echo).

On this picture of same bridge, where the boat thoroughly flat to the left, we can slightly see three arches as a slight echo:



Note we don't see shade of the arches as the beam does not have angle enough with the bridge.

On this bridge:



The boat thoroughly dish past to the right. We can overthink in the shade of the apron to the left. But in this depth, echo valuation more and is displayed of both sides.

In conclusion we can see when we sound deep, we should move away from the target ( aminimum of 3x beam ) , this to have one reflects more just and get true waypoints... » March 20, 2011, 10:17:40 AM » ]   
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  • SMF 2.0.7 | SMF © 2013 , Simple Machines SMFAds for Free Forums

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ITB 24-01
28-FOOT BOAT AND TRAILER FOR LAW ENFORCEMENT DEPARTMENT
Open Bids
Closed
Description:

A “Cone of Silence” is hereby imposed prohibiting communications in connection with this bid or the Project. The Cone of Silence shall be in effect from the time of issuance of this bid through the time the services or Project procured through this bid are formally awarded through the approval of the Village Council.

Any communications regarding this bid or the Project between: a potential Proposer or Firm, including any person acting on a Proposer’s behalf, and the Village Council members, Village staff, including the Village Manager and his staff, Village employees and consultants, and any member of the Village’s Evaluation Committee are prohibited.

Duration of Cone of Silence. The Cone of Silence shall terminate upon approval of the contract by the Village Council.

See RFP document for exceptions that apply to the Cone of Silence.



Publication Date/Time:
1/11/2024 12:00 PM
Closing Date/Time:
2/14/2024 3:00 PM

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COMMENTS

  1. The Cone of Silence raised

    The Cone of Silence raised. by Rob Kothe / www.sail-world.com 21 Mar 2005 10:35 GMT. The Cone of Silence, the super lightweight, super fast Reichel Pugh 30 has an amazing third in the 468 mile Sydney to Mooloolaba race. With her giant asymmetric kite hiding her hull, The Cone was third out of Sydney Harbour behind Steven David's 60 footer Wild ...

  2. The Cone of Silence

    The MC38 is changing the way people think about accessible and affordable high performance inshore sailing says mcConaghy International. Now, it is time to take this concept to a new level - and light up the offshore fleet. Sydney owner Jamie Neill on board Cone of Silence will take on the offshore fleet in Sydney to Southport race.

  3. The Cone of Silence registered for the Chi Mac

    The Cone is currently on a trailer at Sail Newport, preparing for the Bermuda Race. I was chatting with one of her crew and one of her owners this weekend. Owner said he and a couple of buddies "wanted a Melges that can go offshore". Nice guys. The boat is wild and crazy looking, sitting WAY up on its trailer!

  4. Cone of Silence questions?

    Have seen the boat and owners in Newport, Bermuda and Chicago, and are class act guys. Thanks for showing me the boat and hope you do great in with the future of the boat. Oh and just wondering about top speeds, we hit 14 on a 44 at about 0400 Monday morning, after a few knockdowns, how did you guys fare?

  5. Taking a ride on The Cone of Silence in November

    Sailing The Cone of Silence, a Reichel/Pugh Super 30, to Plymouth, Massachusetts in November 2013. Great offshore sailing in less-than-ideal conditions.

  6. Cone of Silence

    I was just wondering what happened to Cone of Silence? It was for sale at wizard yachts just after transpac. Did it sell? What new boats are being developed for the 2004 super 30 races? Any other one-offs like cone?

  7. The Cone of Silence raised

    The Cone of Silence raised. by James Neill & Sail-World on 21 Mar 2005. The Cone exits the Harbour Carey Clausen. Skipper James Neill explains just how his Reichel Pugh 30 out ran all the 50 footers and a Volvo 60 to take third place in the 2005 Sydney to Mooloolaba Race. 'We were lucky and I don't think a 30 footer is going to repeat the ...

  8. Where To Mount A Radome For Best Performance

    On a sailboat, the greater range of a radar mounted on the mast must be weighed against these advantages of mounting it lower: The scanner is less vulnerable to damage from an errant halyard or sail. The "cone of silence" is reduced so that targets close to the boat can still be "seen" by the radar.

  9. The Cone breaks Silence

    The Cone of Silence, arguably Australia's fastest 30 footer, is making history in the Centennial Transpac fleet. ... However, the smallest boat in the fleet, Australia's The Cone of Silence, is breaking the silence. With official permission of Transpac race organisers, the little Aussie battler is transmitting her position from its Argos ...

  10. THE CONE OF SILENCE

    THE CONE OF SILENCE Other Sail boat built by WHITEWATER MANUFACTURING INC, hailing port BOSTON, owner DOUGLAS MITCHELL 4 COLONIAL DRIVE, ARLINGTON, MA 02474 UNITED STATES. Identification information: Official Number 1187234, Hull Number WWA117665DZ2.

  11. Downwind on The Cone of Silence, the Reichel/Pugh Super 30

    While shifting Cone of Silence up to the start of the Beringer Bowl we got a spectacular downwind ride. I tried to capture all the seductive speed and pulse ...

  12. The Cone Of Silence

    The Cone Of Silence - USA 38699 updated their cover photo. nice pic. The Cone Of Silence - USA 38699, Boston, MA. 61 likes. Life is short. Sail Fast.

  13. Noakes Sydney Gold Coast Yacht Race 2024

    The Cone of Silence . James Neill's super fast Super 30 has achieved good offshore results including third in PHS division of last year's Sydney Mooloolaba Race. James is a former trailerable and sports boat National Champion and on board for this race will be Mark Mathews, the boat's builder, and maritime barrister Edward Coe who has ...

  14. Cone of Silence

    Cone of Silence. Country: USA: Builder: Brenmark Industries: Length: 30' Type: Racer

  15. Cone of Silence

    Cone of Silence Thread starter sshow bob; Start date May 9, 2016; ... They're taking offers but the boat and sails are in rough shape after kicking around Boston for a few years. Trickypig Super Anarchist. 4,399 125 Australia. May 9, 2016 #18 GTC . Teaky Super Anarchist. 3,078 126

  16. Cone Of Silence

    Epic adventure. Did we mention 811 miles in 80 hours.. nasty business..

  17. THE CONE OF SILENCE Boat & Vessel Information

    Boat's Length: 31.3999 ft: Boat's Gross Tons: 10: Boat's Net Tons: 9: Vessel Build Year: n/r: Ship Builder: n/r: Hull Shape (e.g. Monohull, Trimaran, Catamaran, Unknown) Sail (Faired Keel) Propulsion Type: UNSPECIFIED: Download Data Download all available information for this vessel to a formatted spreadsheet or other file type

  18. Cone of Silence

    Photos of the Cone of Silence

  19. Cone Of Silence

    My hat's off to the boy's on "Cone". Bringing the boat to Transpac, twice. But looking at the trac's & weather charts. Could there race be a dud? still in "non planing " conditions. It looks lie they are getting " Waterlined" to death. If & when the "Trades" fill, can they make up the...

  20. SI imaging cone of silence

    OK here goes. the questinn of will side image see directly under the boat Side imaging not the 2d down. (we know that will) From the 1197 technical it is shown that the sonar cone is 86 degrees wide. ... From the 3 pictures we will see that ther could exist a cone of silence (for lack of a better description). Remember this is math and not ...

  21. The Cone of Silence..... On fire!!!

    This little Reichel Pugh 30 is making quite a few larger yachts look very silly. So far they have had light to moderate breezes from most points of the compass. When the forcast Southerlies kick in the boat is sure to open a can of whoop arse on the rest of the fleet.

  22. Bid Postings • 28-FOOT BOAT AND TRAILER FOR LAW ENFORCEMENT

    28-FOOT BOAT AND TRAILER FOR LAW ENFORCEMENT DEPARTMENT. Category: Open Bids. Status: Closed. Description: Invitation to Bid 24-01 28-FOOT BOAT AND TRAILER FOR LAW ENFORCEMENT DEPARTMENT. A "Cone of Silence" is hereby imposed prohibiting communications in connection with this bid or the Project. The Cone of Silence shall be in effect from ...

  23. cone of silence RP 30

    cone of silence RP 30 Thread starter tendegreealex; Start date Apr 21, 2017; ... More options Who Replied? tendegreealex Member. 321 2 Seattle, Wa. Apr 21, 2017 #2 Anyone seen this boat lately? What is it up to? F. full circle Super Anarchist. 1,835 85 Ventura, CA. Apr 21, 2017 #3 go the cone! Kevlar Edge Super Anarchist. 2,441 29 On the road ...