[C320-list] Math problem

[Stan]

I believe the blanked section would be 169 to 191 degrees based on an
included angle of 21.865 (22) degrees.  I'm curious why you would bother
with this.  Does the manual recommend it?  If so, why?

Stan
"Our Little Amusement" #744

On Thu, Jan 20, 2011 at 9:14 AM, Bryan Campbell <bcampbell at valp.net> wrote:

> Based on Irv's calculations (23 degrees) your blanking are would be 157 to
> 203 degrees assuming that dead ahead/the bow is 0/360 degrees.
> Cheers, Bryan
> #627
>
> -----Original Message-----
> From: c320-list-bounces at lists.catalina320.com
>  [mailto:c320-list-bounces at lists.catalina320.com]On Behalf Of Irving
> Grunes
> Sent: Wednesday, January 19, 2011 5:08 PM
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Math problem
>
>
> John.
> Its calculates to a little more than 22 Degrees.
> I dropped a perpendicular from the angle between the 14.5 degree legs to
> the
> 5.5 leg making a right triangle of Hypotenuse 14.5 and the 2.75 adjacent
> side. Using cosine that angle is is a little less than 79 degrees
> subtracted
> from 90 degrees is a little more than 11 degrees.
> Times two because we bisected the angle, then the blanking area is a little
> more than 22 degrees.
> i was too lazy to do the interpolations, so use 23 degrees.
> Irv Grunes
> #851
>
> On Wed, Jan 19, 2011 at 3:16 PM, <LOCALJG at aol.com> wrote:
>
> > I am about to hang a Furuno Radar dish on my mast.  There is a  way to
> turn
> > off the radar where the radar signal sweeps past the  mast. This small
> part
> > of the radar's sweeping arch is called the "blanking  area."    So in
> order
> > to find the amount of blanking area, I need  to do a math problem.
> > Regrettably I am mathematically challenged and  wish to gain assistance
> > from
> > someone more inclined toward numerical  dexterity.
> >
> > Here is the challenge:  Think of this as a simple triangular  equation.
> > Two legs of the triangle are 14.5 inches long.  The  base of the triangle
> > is
> > 5.5 inches long.  I need to know the angle  in degrees of the apex of the
> > triangle.
> >
> > The 14.5 inch legs are being measured from the center of the  Radar dish
> to
> > the sides of the main mast.  The distance of 5.5 inches  is the distance
> > between the two 14.5 inch legs of the triangle at the  mast.  The
> blanking
> > area of the radar will be around 6 degrees. I will set  this in the radar
> > when
> > I program it following installation.
> >
> > Thanks for the help.
> >
> > John G.
> > 1996 #329
> >
>
>


-- 
Stan
"Our Little Amusement"
C320  #744
N 36 01' 33"
W 114 46' 08"
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