No question we agree that certain concrete damages copper. Grant KZ1W Actually, the problems with copper tubes in concrete aren't at all as well documented as you might imagine. Google "copper tube c
Consider what is used to connect the Ufer rebar system to a tower, or to the electrical panel, or to anything else being grounded. Except for the rare instances of rebar being hard welded directly to
My sailboat was at the wharf, plugged into shore power when a thunderstorm passed by about a 1/4 mile away. Each lightning flash was accompanied with an arc over SNAP in the 120v outlets. Scary how m
My thinking about locks - every item has a failure mode and locks are no exception. What if the lock won't disengage or worse snags with the tower up or partially down? How does one safely disengage
I can't follow your analysis, so here are some numbers for an HDX589 from my PE analysis: EIA-222-F 85 mph 3 second gust 71 mph fastest mile no ice leg compression 41538# base connection moment 80330
I'd let the sides float and isolate the cables. What is the barn roof? If galvanized steel, then let that float also so you can use it as an elevated ground plane. For safety you can connect it to DC
Rick, It was my wrong assumption that crank ups were in the question. Guys on the mast by the prior owner of your HDX5106 tower - very interesting! I have a Trylon T200-80 on the ground which is rate
or the "figure 8 flake", very useful when the "cable" is too heavy to hold, such as the bundle of cables when lowering a crank up, 200' of garden hose, or a 1" mooring line. There is no twist put in
Except if the rope is low stretch, e.g. Arimid, dacron/polyester and kevlar are alternatives. Some stretch less than steel. DO NOT use nylon or polypro. Since these ropes are temporary you don't need
Check out the finite element analysis that Kurt K7NV has on his web site re pier pin and solid guyed towers. it is quite instructive about the advantage of pier pins - they can handle higher loads th
My 589 UST supplied bolts were not galvanized. McMaster has suitable bolts. Grant KZ1W I will be installing a UST HDX-572MDPL in a month or so. The UST FAQ calls for 1"x27" anchor bolts; ATSM F1554 G
There are standards for when a wire rope should be replaced, one from OSHA https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=34 another at http://www.grainnet.com/articles
No experience with wire rope on nylon, but you might consider the UV degradation of nylon as a drawback, particularly since one segment of the sheave is exposed for long periods. (assuming you leave
The wind standards include a wind profile formula, i.e. the wind velocity at ground level is zero and increases with height. I doubt that Rohn or any other tower maker wouldn't take advantage of the
Dan, The Supremes recently ruled on a similar case, see http://www.pacificlegal.org/releases/PLF-statement-on-Koontz-property-rights-victory-at-the-Supreme-Court You might take a copy of the decision
Roger makes a good point about many rotator bearings needing some axial load and the high axial loads they are rated for. I would add a concern about the dead weight load imposed on the tower if a th
Portland Bolt has the specs on their web site for tightening A325s. However, the question will remain if the connections are "slip critical". If so then the torque is near to the web site value than
The DX Eng "V" saddle clamps are better than any muffler clamp since the casting will not splay out as the sides of a muffler clamp are prone to do under compression. The "V" clamps are needed for pi
It's not too difficult since you don't need to calculate the stress in the tower and assume it is strong enough to handle the lifting force. 1. Calculate the moment arms for the tower only. Either as
Roger, I have both 2800s Yasesu & Orion. Both are excellent rotators, but with large differences in capabilities and that shows in the price. However, if you ever need to dig into the yaesu controlle