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writes: > From: "fev" <fev@ciudad.com.ar> > To: "Force 12 talk" <Force12talk@qth.com> > Subject: [Force 12 Talk] Is posible to use a Tailwister Rotor for a C-31XR > and Mag 240N array? > Date: Sun, 5 Nov 2000 09:34:30 -0300 > > I bought from tower tech the MARC ( Mast, Antenna and Rotor Calculator) 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.) > Interesting problem. The Effective Moment capacity figures are factory ESTIMATES but based on real-world situations. You're over-capacity (the factory EM factory figure is 3400 ft/lbs.) so using the T2X would probably reduce its service life. You've got an aggressive system that's about 30% over the rotator capacity so the safest and most reliable things to do are either reduce the antenna load or get a bigger rotator. Cheers, Steve K7LXC Tower Tech Champion Radio Products -------------------------------------------- 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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