| Author |
Message |
    
Applejack
Intermediate Member
Username: Applejack
Post Number: 153
Registered: 8-2003
| | Posted on Saturday, May 08, 2004 - 9:38 am: | 
|
how is wind load figured on beams, or what is the wind load on a 104c?,,,aj |
Allagator
Intermediate Member
Username: Allagator
Post Number: 271
Registered: 9-2002
| | Posted on Saturday, May 08, 2004 - 11:38 am: |
|
Hey AJ (without the milk ) HE HE HE !!!!
the M104C has a Surface Radius of (6.33 sq ft)
and weight of 25 pounds !!!
i use a tv style rotor but it dont take the wind very good so i would try a biger rotor for the M104C cause of the wind load !!!!! and how its figured is a good one cause i dont know !!!! LOL
just check the sq.ft of the antenna and check what the rotor will handle is how i always done it !!!!!! hope it helps !!! Allagator !!!! |
Ca346
Advanced Member
Username: Ca346
Post Number: 752
Registered: 8-2003
| | Posted on Saturday, May 08, 2004 - 9:31 pm: |
|
AppleJack:
I am taking this from the Force 12 site so I must credit the source: It ain't easy...
the Force-12 brochure has the following
explanation of their wind load calculation:
"WIND LOAD is the worst case wind resistance for the antenna. Using the
latest structural analysis, the wind load is either the total element wind
load OR the boom wind load, whichever is the larger resistance to the wind.
Most beams have more element than boom wind load. The figure specified is
the effective area, which is the projected area of the elements or boom,
multiplied by 2/3 for a cylindrical surface."
Does that help? Oh Yeah.... |
Applejack
Intermediate Member
Username: Applejack
Post Number: 154
Registered: 8-2003
| | Posted on Saturday, May 08, 2004 - 11:21 pm: |
|
ca346, i read that twice and still said "huh?" so my next question is probably already answered there too. "How does load measurement change for horizontal". allagator, i have a cd40 rotor but its crapping out, and i was wondering what was the minimum rotor i could get away with...aj (with no milk) |
Ca346
Advanced Member
Username: Ca346
Post Number: 754
Registered: 8-2003
| | Posted on Sunday, May 09, 2004 - 4:55 pm: |
|
Horizontal and Vertical wind load would be the same IF... the same number of elements are used. For example, my 4 element Quad has 4 vertical and 4 horizontal elements (actually wire on mine). Easiest to do is find out the wind load of the various antennas and then search for a rotor that will handle more than that.
Now if you really want a good discussion, ask someone about the "K" factor, and the "TORQUE"... I don't have a clue, but I can read the spec's on my rotor (Yaesu G-800DXA). Sounds impressive.... |
