[C320-list] Math problem

[Bryan Campbell]

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
>