wedge40 said:
I was amazed at the reach of these things.
with a ballast box I wonder just how much you could lift, rafter wise that is.
Wedge
Double the length, half the capacity. As an example, if you have loader lift arms that are 8' from where they pivot to the bucket pivot pins(8' from pivot to load), and you have a 1500# capacity at the bucket pivots, an additional 8' boom(16' from pivot to load) would effectively half that 1500# to 750#, provided the boom structure(particularly where it meets the existing loader arms) could handle the stress, another 16'(32' from pivot to load) would half it again to 375#, again assuming the structure could support that much. This is not including the weight of a boom structure capable of supporting that much weight, so once you factor that in, 30' of reach(from the rear loader arm pivots) has very little margin for lifting a load.
That is for a static load. If you factor in potential "G" induced live or shock loads, A bump while trying to position something you picked up could easilly double or tripple the weight of the load out on such a long moment arm. This could stand you on your nose, but more likley would just collapse the structure or pretzel your loader lift cylinders. Or it would destroy the loader pivot structure and the whole thing would try and crawl into the drivers seat
If you are only lifting a 100# truss 15' in the air, I am sure it can be done with a carefully designed/supported boom with a reasonable margine for error. What you are paying for on that one pictured is their engineers carefull study and their workmanship that says this thing is not going to collapse when used within their published limits and kill someone...
If I was going to do this every day for a business, I might build something for this. If I was doing this one time to put up a new barn or shop, it would probably be more feasable to go rent one of those telescoping forklifts to put the trusses on my building.
my .02