When I built my house, I, too, had the builder do the tower base, guys
anchors, conduit, etc., and it was written into the contract.
WATCH THE BUILDER VERY CLOSELY. At first, he basically ignored all the
Rohn diagrams I gave him, and he tried to dig holes about 2 ft deep,
etc. These guys will try to get away with anything they can!
GL,
Barry W2UP
W4LDE-Ron wrote:
> I have recently written a contract on a new home, 2.5-acre lot with lots
> of trees, and as part of the contract the builder gets to install the
> tower base plus the pour and conduits back to the house plus clear an
> area for a new tower/beam.
>
> My plans are for a SteppIR 3 element with a wind load rating of 6.5 sq
> ft plus a small 4 - element two-meter beam. The home area is rated at
> 70MPH wind speed.
>
> My dilemma is what tower to use? Due to age and other conditions I will
> need a tilt over crank up. I also want a neighborhood friendly tower if
> that’s possible. All CCR issues have been resolved.
>
> My first thought has been the U.S. Tower model MA-550 with the
> freestanding self-supporting base model MARB-550 that allows for the
> rotor at the base and the tilt over unit MAF-550.
>
> Second tower to be considered is the Tashijan TM-358 tower with the
> rotor cage at the top since I do not think they make a base rotor mount
> option. The WEB site is lacking in information and I am not sure what
> tilt over device is available if any.
>
> Third and last is the Heights Tower crank up aluminum 42 ft at a wind
> load of 12 sq' at 80 MPH.
>
> My only experience is with a guyed Rohn 25G 40' tower and what I will
> greatly appreciate any feed back on is!
>
> 1. With the rotor at the base, as in the U.S. tower MARB; will the
> rotation torque be amplified? I assume there's a thrush bearing at or
> near the base?
>
> 2. Will the sway be reduced since the rotor is not at the top? With tile
> over I can still service the rotor and not need the base rotor assembly
>
> 3. How bad is the sway with the tubular type towers in general?
>
> 4. With a rotor gage at the top of either the U.S. Tower or the Tashijan
> doesn't this add to the wind load ratings and how do I calculate that load?
>
> 5. It appears that the U.S. tower has a thrust bearing for the base
> mounted rotor? The others will require added cost? Guess the thrust
> bearing gets mounted in the rotor gage for the Tashijan or shelf on the
> Heights model
>
> 6. Can I expect noise form any of the three above in the cranked up
> position. What has been your experience with noise?
>
> 7. What have you experienced with delivery time and support from the
> manufacturer? I will need the base assembly on site near the end of this
> year.
>
> Last and final question, if you were to buy a new tower with a desired
> height of around 45 feet and be neighbor friendly what would you buy?
> You thoughts and recommendations are greatly appreciated.
>
> 73 de
>
> Ron W4LDE
> _______________________________________________
>
>
>
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>
>
>
--
Barry Kutner, W2UP Newtown, PA
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