[TowerTalk] RE: Rotor comparisons

R. Nezelek rnezele1@rochester.rr.com
Mon, 4 Sep 2000 13:45:33 -0400


FYI,
Regarding the +/- 14 degrees comment.
I just purchased this rotor and that comment really means you can go an
additional 14 degrees past the nominal 360 degrees of rotation both in the
counterclockwise (ccw) and clockwise (cw) rotations. Also, that value is
programmable. It's all described in their manual.
Bob, W2CNS

> -----Original Message-----
> From: owner-towertalk@contesting.com
> [mailto:owner-towertalk@contesting.com]On Behalf Of R. Otto
> Sent: Monday, September 04, 2000 11:12 AM
> To: towertalk@contesting.com
> Subject:
>
>
>
> Hello towertalk,
>
> We're back to one of those "how do ya tell" questions.  Based on the
> input here (which was pretty diverse) I went to the sites for several
> rotors to compare specs.  Rotors, just like antennas, have no standard
> of comparison.  Each company has it's own gobbledygook of marketing.
> For instance, how do you compare the following??
>
> Orion 2800  -
> Wind Area Capacity            35 sq. ft.
> Starting Torque               3500 in. lbs.
> Rotating Torque               2800 in. lbs.
> Braking Torque                17,000
> Vertical Load Capacity        1800 lbs
> Mast Size (OD)                1.75-3"
> Rotation Speeds / 360 degrees 55 TO 300 sec.
> Rotation Range                0-360 degrees -+ 14 degrees
> Weight (rotator unit)         42 lbs.
>
> Cost                          $1429 with controller
>
> Yaesu G2800SDX -
> Wind Load                     23.5 Sq. Ft.
> K-Factor                      2,020 Ft.-Lbs.
> Stationary Torque             433 Ft.-Lbs.
> Rotation Torque               43-79 Ft.-Lbs.
> Max. Vert. Load               440 Lbs.
> Max. Vert. Intermittent Load  1320 Lbs.
> Mast Size                     1-1/2 - 2-1/2 In.
> Backlash                       2
> 360 Rotation Time            35-74 Seconds
> Weight                        7.7 Lbs.
> Cable Conductors              5
>
> Cost                          $1069
>
> Couple of observations.  If I convert Yaesu's ft/lb to
> in/lb by multiplying by 12, the Yaesu still comes out quite a bit
> on the short end
> of the stick.  Interesting that the Orion has a 360 degree rotation,
> +/- 14 degrees.  Seems to me that's not very good.  Theoretically it
> could be 15 degrees short, when I'd really like to see over 360
> degrees so I can quickly hit that station that always seems to be just
> the other side of the mark requiring a 350 degree rotation <G>.
>
>
> I've tried to find the "Prop Pitch" rotor and had no success.  Same
> with Aztec RF.   Any ideas?
>
> 73's from....
>
> R. Otto
> N8NGA@one.net
> Cincinnati, Ohio
>
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