[Public-List] Radar - self levelling mast mount

Tue Apr 6 09:01:44 PDT 2010

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

---- John Birch <Sunstone at cogeco.ca> wrote: 
> 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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> 
> 
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