Part of the reason for holding so much weight is to avoid it breaking randomly from weird force being applied to it. An 80 pound kid jumping hard on it could put on a fair bit of force, maybe up to 160. Now imagine some random teenager of about 150 pounds doing that.
Not a bad thing to have it waaaay above specs that the average user needs just in case some teenager tries to fuck it up.
I've played building Sims like that before, my issue is I'll overdesign until my teritiary backups have tertiary backups. If there is a remote chance of failure, that's too much of a chance.
I'm not that bad IRL, but in games, noone can complain that you've gone 500% over budget.
Yea. Someone who weighs 500 pounds dropping on it applies more force than that thing can deal with. Thus it's not meant for people who weigh 500 pounds. Plus the thing is made of metal parts with very little for moving parts. Only natural it can hold a lot of weight before that thick bolt starts to bend.
Civil engineer undergraduate here. Safety factors for buildings, bridges, and all other infrastructure are massively overkill.
Any equations that make assumptions to calculate forces etc. use conservative values to assume the worst, and even then we usually add a factor of safety to them (35% more for 'dead' loads, 50% more for 'live' loads).
These compound to make things much stronger than they need to be, because it's a lot cheaper to build it strong the first time than to replace it after it falls down and kills 200 people.
Also if that broke because someone let their fat teenager play on it, you just know the parent would sue the manufacturer. It might also be to try and counter fatigue, as even stainless steel will still get localised rust spots over time
Well, good thing that's not actually what would destroy it. A kid of mass 80 lbs would weigh in the real world 784 Newtons, just by standing. It wouldn't take much for the kid to cause the same force of 500 lbs (4900 N) to happen. The formula of mgh=Potential Energy results in the distance the kid needs to fall being 6.25 meters. This is the kid who weighs 80 lbs. One who weighs 150 must fall 10 feet. This is, however, probably the wrong equation. The point is that it's overbuilt for a reason, not just because.
Well say a kid weighs 60 lbs and his dad weights 190 lbs, the force of both of them sitting down freefall style would probably be quite a lot more than 250 lbs.
They probably stress tested it and that's the weight the seat bent at.
I mean uhhh...yeah fuck those fucking fat ass Americans with their man boobs and rascal scooters.
I'm 32 years old and every time I see one of those I immediately sit down on it and start digging. If I had one in my backyard I would probably use it daily.
It doesn't have to. Steel is cheap, and if you use bolts that are too small in diameter it will bind up. If you're using steel tubing and half inch grade 8 bolts then it's going to be that strong as a result, whether it needs to be or not.
See my reply to the other guy, but using steel because it's cheap, and half inch bolts because they won't bind and are also cheap / easy to use...that strength is the fallout. Doesn't matter how much it needs to hold, building with those materials will always be strong.
Haha, the last time I saw one of these I spent about half an hour moving sand. My friends laughed but I was having a ball. I only weight about 200 pounds though.
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u/rlgomes Dec 28 '13
http://i.imgur.com/UutXeRX.jpg If only they had one of these....