While this may be true, the realization that hollow concrete block is being misused here, should take precedence.
A light tractor, a small car, or what have you... if you are going to support the weight of same, CMU is a very poor choice of material and you put yourself at risk by doing so, every time, whether it crumbles and falls or whether you get away with it. And sure we have all done this, there is no doubt, however the practice is highly unsafe for the reasons mentioned. Now, say I had some certified 5000 psi CMU, 75% filled cells orientated vertically, a small tractor like this A-C or similar, probably won't crumble them, as it would take more than 5000 psi in compression to do so, the tractor itself does not weigh that much. However, you could crumble one of these with a heavier load, or if it has been compromised unknown to the user. Compare that to what you see in the video, Lanse is using an unknown CMU material, cells are horizontal, and the weight, is at least 1000 lbs + or - is placed onto the CMU, this is definitely unsafe.
Now here is another thing to toss in, realize that 3-4 courses high, just loosely stacked, if those top CMU's fall on you by themselves, it can and will break your legs, I have seen that first hand, both legs broke, compound fracture on one, 3 courses high stood on ends with boards for shelving, person grabbed onto the top one after stumbling, it fell across both legs, fractured same. It started by the improper use of this material, hard to believe that one of these, from 3'-0" to 4'-0" high can cause an injury like that. A different situation, but something many would not even consider.
Typical scenario with CMU:
People find new, used or old concrete block, then make use of a material they know nothing of or are certain about, like the strengths, physical properties, and or the safe use of same, as designed, as well as whether it has been compromised or not to support a substantial and often times unknown load, one that is also a work area, while it is supported.
You are at serious risk when working near an improperly supported tractor, car or piece of equipment, it's that simple, whether you get away with it or not, hollow concrete block is a very unsafe choice of materials to use for this purpose, principal or not, even with a light load, it's a practice to condemn, why take chances ? But..... like I said each to their own.....people will do what they want no matter what you tell em anyway...
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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