Yeah, but that's for the specific npm. It's got to be base on something. I gotta build a custom npm in a limited pie slice footprint to hold a 4 foot, and 2 3 foot antenna about 7 feet up, and preferably a pmp cluster around 20 feet. I ordered 4k lb. ballast today. The site guy says 4k isnt a problem, still makes me nervous putting that much ballast and sled weight in 100 sq feet to hold a structure I dont have any way to calculate.
I'm thinking that with 2 ton of ballast, my issue will only be holding the structure to the base. Considering a square with 10 foot 25g on each corner and 20 foot 25g in the center. If it will fit in the pie shape. Steel I think will add around 1k more lbs if I'm bracing with 2 inch angle iron. But how does a guy even start to calculate windload on that. Add in 3 inch water pipe it gets heavy but kite like. 4k on 10x10 is only 40 lb per square foot. Being the helmet that I am because retard isnt PC, is making this complicated. I have found zero designs or existing product that do what I need to do without drilling into the concrete, which I'm not allowed to do. I do have 2 attached angle iron I may be able to strut to. Grain elevators are a bitch, you'll find a 3 year old pop bottle up there that hasn't moved but a piece of steel flies off in a breeze On Mon, Aug 17, 2020, 10:02 PM Adam Moffett <dmmoff...@gmail.com> wrote: > There's often a formula on the assembly drawings. > > On 8/17/2020 10:36 PM, Chuck McCown wrote: > > Probably depends on the actual wind load vs the design wind load. If > both were lightly loaded then you will probably be fine. > > > > Sent from my iPhone > > > >> On Aug 17, 2020, at 7:45 PM, Steve Jones <thatoneguyst...@gmail.com> > wrote: > >> > >> > >> so if I have 2 npms that call for say 1000lbs ballast with mast and > antenna and decide to move both masts to a single npm, does that equate to > 2000lbs ballast, or is there a base weight, then aperture windload is > calculated? > >> > >> -- > >> AF mailing list > >> AF@af.afmug.com > >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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