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> I bought from tower tech the MARC ( Mast, Antenna and Rotor Calculator) software and > the calcultion result are this: > > Wind Speed: 70MPH. > Mast OD: 2 ", > Ant 1 (C-31XR): 10.7 sq.ft , 1 ft height , 82 Lb, 23.8 ft turn radius. > Ant 2( Mag 240N): 6.8 sq.ft , 9 ft Height, 85 Lb, 30.4 ft turn radius. > Total bending moment is : 18360 inch.Lb. > Recommended Yield Strength :42000 PSI . > Mast thickness: 0.188" > Recommended rotor for >4536 FT.LB torque are : HY-Gain HDR 300A, Yaesu > G-2800SDX. > > Material for the mast : Carbon Steel CD 1026 or 1022 0r 1018 or 1016 > > I bought a Tailtwister rotor because is was rated for Antennas until 20 > sq.ft in my case the Area is 17.5sq.ft > but taken this calculation it is not recommended!! > The Question is in the practice what are you using in similar conditions? > ( I live in Buenos Aires we never have ice on the antennas and winds are > never more than 50 mph.) > > thanks for your comments , Francisco LU3EEC. > > > -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact n4zr@qth.com |
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