[Public-List] Radar - self levelling mast mount

[George White]

John:

Thanks.  I did a quick sketch, and at a 30 degree heel it looks like a unit 
10 feet above deck would still clear a foot or so above the head of standing 
crew on deck, assuming a 25 degree vertical beam.    Also, the distance 
between the crew member on the higher side and the antenna would be greater 
than what I understand is the minimal safe distance for short intervals.

This would probably be sufficient tolerance.

Other comments would be welcome.

George

----- Original Message ----- 
From: "John Birch" <Sunstone at cogeco.ca>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Sent: April 6, 2010 9:01 AM
Subject: Re: [Public-List] Radar - self levelling mast mount


> Hi George,
>
> All I know is what Raytheon told me. The duration of somebody on the 
> windward deck in those conditions is slim and the height of the unit above 
> the deck plane is still sufficient unless you plan to sail for extended 
> periods at 45-55 degrees heel it shouldn't be a problem.
>
> It will still be much higher than if mounted on a pole and the power draw 
> won't allow you to run the unit all the time anyway.
>
> Best
>
> John
>
>
> ----- Original Message ----- 
> From: "George White" <salty at ns.sympatico.ca>
> To: "Alberg 30 Public List -- open to all" 
> <public-list at lists.alberg30.org>
> Sent: Tuesday, April 06, 2010 7:51 AM
> Subject: Re: [Public-List] Radar - self levelling mast mount
>
>
>> Thanks.  My concern with putting it that low would be that the 
>> combination of a significant heel angle of the boat and the scanner being 
>> level the pulse would hit someone on the windward deck?
>>
>> George
>> ----- Original Message ----- 
>> From: "John Birch" <Sunstone at cogeco.ca>
>> To: "Alberg 30 Public List -- open to all" 
>> <public-list at lists.alberg30.org>
>> Sent: April 5, 2010 8:36 PM
>> Subject: Re: [Public-List] Radar - self levelling mast mount
>>
>>
>>> Hi George
>>>
>>> Suggest you put it about 1/3 distance below the spreaders. This will 
>>> give you a much better opening between the forestay and mast for tacking 
>>> the Genoa. And you are not really losing any meaningful range for the 
>>> radar, plus you are reducing the top-hamper of the weight aloft 
>>> considerably.
>>>
>>> It will be high enough so you don't bake your brains with the microwaves 
>>> either.
>>>
>>> That is where Raytheon suggested I mount mine on my A-37 before I canned 
>>> the whole idea for a while anyway. (Money & power draw were the 
>>> reasons.)
>>>
>>> Just a suggestion anyway
>>>
>>> Best
>>>
>>> John
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "George White" <salty at ns.sympatico.ca>
>>> To: "Alberg 30 Public List -- open to all" 
>>> <public-list at lists.alberg30.org>
>>> Sent: Monday, April 05, 2010 6:52 PM
>>> Subject: [Public-List] Radar - self levelling mast mount
>>>
>>>
>>>> Does anyone have experience with Scanstruct self levelling mast radar 
>>>> mount?
>>>>
>>>> Also, should additional ballast be added to compensate for the weight 
>>>> of a 21 pound radar mounted neaar the spreaders?  If so, how or where 
>>>> should ballast be added?
>>>>
>>>> George
>>>>
>>>> Close Harmony
>>>> ----- Original Message ----- 
>>>> From: "Derrick Serrer" <cptn_derrick at yahoo.ca>
>>>> To: "Alberg 30 Public List -- open to all" 
>>>> <public-list at lists.alberg30.org>
>>>> Sent: February 22, 2010 10:39 PM
>>>> Subject: [Public-List] (no subject)
>>>>
>>>>
>>>>> Hello everyone,
>>>>> Just wondering if anyone has ever given any thought to adding a radar 
>>>>> arch on their A30? I am contemplating the positioning of my radar unit 
>>>>> and eventually solar panels and an arch seems to be a logical choice. 
>>>>> If anyone out there has one, I would love to see pictures.
>>>>> Thanks
>>>>> Derrick
>>>>> #127
>>>>>
>>>>>
>>>>>
>>>>> 
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>>>>
>>>>
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>>
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>
>
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