Classic SeaCraft Community - 20' CC Radar Question

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- - 20' CC Radar Question (http://www.classicseacraft.com/community/showthread.php?t=25569)

Quote:

Originally Posted by BigLew (Post 217131)

What is the height of the intended mount above sea level? Figure that 1/2 the 3.9 degree angle of the beam is 1.9 (or 2, for simplicity). Look at it as a right anlge triangle and figure the
distance out ahead of you that the beam hits the surface of the water. That will be the nearest distance your radar will show on the water surface. Check your trigonomety equations. Sine = opposite divided by hypotenuse, cosine = adjacent divided by hyponteuse, and tangent = opposite divided by adjacent. The angle value you use 1.9 degrees. The right traingle is 90 degrees, 88 degrees and two degrees. You should know the height of the radar dome (mounting height). Any problem ask a high scool student who has had trig!

Isn't 48 miles a little overkill for a 20' boat?

Trigonometry? I hated trig... liked AP Calc even less. But then, I didn't very much apply myself none too much needer. The wife LOVED trig and she's going back to school, I'll get her on it right away!

Nah, man. The more range the better. Plus this Radome has "bird mode." I'm really looking forward to that.

Quote:

Originally Posted by strick (Post 217133)

Not for this boat ;)

strick

Pfft. How would you know?

Pssh.

Pfft. ;) :D

Quote:

Originally Posted by TooFly (Post 217139)

Pfft. How would you know?

Pssh.

Pfft. ;) :D

Paul,
Don't you need to fess up or have you already been to confession? ;)

Quote:

Originally Posted by ScottM (Post 217164)

Paul,
Don't you need to fess up or have you already been to confession? ;)

Fess up? Wh-wh-whatever do you mean? :confused:

:D

Quote:

Originally Posted by ScottM (Post 217164)

Paul,
Don't you need to fess up or have you already been to confession? ;)

I offer the sacrament of confession on Saturdays at 3 (by appointment), and I've not heard a thing....from ANYONE on this nutcase list :0

Quote:

Originally Posted by Fr. Frank (Post 217230)

I offer the sacrament of confession on Saturdays at 3 (by appointment), and I've not heard a thing....from ANYONE on this nutcase list :0

Gentlemen,

A lot of stressing over the wrong beam angle!

The horizontal beam angle may be 4degrees, but the vertical beam width is probably around 25 degrees.

What that means is the radar has a narrow beam with for separating channel markers or pilings on the water. The 25 degree beam angle will not separate a boat from a UFO if they're on the same relative bearing and ones on the surface and one is hovering at 100 feet.

The 1 degree down angle at rest is fine. It will give best performance compromise between cruising to the fishing grounds and keeping a watchful eye out while checking the sounder for structure.

Just my.02,

BuzzCutt