jamal posted:I thought the problem with those wheels was that they decided to put the spokes in compression Its even worse than that: they designed the wheels to use both compression and tension. As the wheel spins, the spokes on the bottom were in compression and the spokes on the top were in tension. Oh and they also only did tension quality checks on the spokes, with no testing of their ability to hold a compressive load.
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# ? Nov 18, 2011 14:09 |
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# ? Mar 29, 2024 16:14 |
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And I thought the big bubble in the middle of the tread I got in the China junk tire on my Grand Prix was bad. I treated it like it was an active bomb and it was nothing like the one on that Honda.
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# ? Nov 18, 2011 14:23 |
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CaptBubba posted:Its even worse than that: they designed the wheels to use both compression and tension. As the wheel spins, the spokes on the bottom were in compression and the spokes on the top were in tension. Oh and they also only did tension quality checks on the spokes, with no testing of their ability to hold a compressive load. Just looking at that makes me wonder what they could possibly be thinking. Sure, they reduce the number of spokes, but they are demonstrably bigger - seems like aerodynamically and weight wise it would be a wash. On a similar note, how do they "tune" those solid wheels? With spokes, you tighten or loosen them to get it perfectly flat - and my guess is that any anomaly in the tire or tube that might pull it out of true gets fixed when you tune it. How do those solid wheels work? Edit: Please don't say "magnets"
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# ? Nov 18, 2011 16:02 |
Truing involves adjustment to the spoke tension at the hub, followed soon afterwards by a letter from Mavic denying any responsibility for the resulting failure.
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# ? Nov 18, 2011 16:26 |
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CaptBubba posted:Truing involves adjustment to the spoke tension at the hub, followed soon afterwards by the last spoke you attempt to tighten snapping off just as you think you're done. The nice thing about metal spokes is you can actually tune them by ear like you would a guitar. Tap spoke wrench against the spoke and try to match the tones all the way around. THEN you get out the runout gauge. I've attempted to true rims using just the runout gauge and it takes at least twice as long and never comes out quite right.
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# ? Nov 18, 2011 17:11 |
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When I worked on the Wilson bridge project I heard some guy there was severely injured by an exploding tire on the 100 ton travelift. I heard it flipped him over and blew out an eardrum. This was before I started but the tires were about 6 feet tall and routinely had leaks from the jobsite.
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# ? Nov 18, 2011 18:26 |
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JD Brickmeister posted:Just looking at that makes me wonder what they could possibly be thinking. Sure, they reduce the number of spokes, but they are demonstrably bigger - seems like aerodynamically and weight wise it would be a wash. I don't think you can true most (all?) solid carbon fiber wheels. They'll probably snap before they lose their shape anyway.
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# ? Nov 18, 2011 20:15 |
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Mercury Ballistic posted:When I worked on the Wilson bridge project I heard some guy there was severely injured by an exploding tire on the 100 ton travelift. I heard it flipped him over and blew out an eardrum. This was before I started but the tires were about 6 feet tall and routinely had leaks from the jobsite. So yeah - tires.
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# ? Nov 18, 2011 22:14 |
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Longinus00 posted:I don't think you can true most (all?) solid carbon fiber wheels. They'll probably snap before they lose their shape anyway. You couldn't true the Spin wheels I had briefly.
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# ? Nov 19, 2011 02:47 |
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JD Brickmeister posted:
Yeah, tires. https://www.youtube.com/watch?v=uQbKCd3ezrA
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# ? Nov 19, 2011 14:23 |
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I really want to punch the engineer that okayed those wheels. They were either increbily stupid or just didn't care at all.
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# ? Nov 19, 2011 17:02 |
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Heard a motorcycle tire explode once from overinflation, I couldn't believe how loud it was. Sounded like a 12 gauge.
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# ? Nov 19, 2011 17:35 |
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Rev. Dr. Moses P. Lester posted:Heard a motorcycle tire explode once from overinflation, I couldn't believe how loud it was. Sounded like a 12 gauge. I was driving back home one night on I-95, about 2 in the morning, and was passing an 18-wheeler just as it had a blowout. It sounded like someone put a 12-gauge next to my ear and fired it. Scared the poo poo out of me until I looked over at the truck and saw the trail of sparks from the shredded tire, and even then it took probably about 10 minutes for the adrenaline to metabolize. Tires exploding following a rejected takeoff test of the A340 (basically a worst-case test: maximum TOGW, worn-out brakes, speed at V1): https://www.youtube.com/watch?v=hRzWp67PIMw Edit: Here's a 747-8 version of the same test: http://www.boeing.com/Features/2011/05/bca_747-8_RTO_05_04_11.html Phanatic fucked around with this message at 18:17 on Nov 19, 2011 |
# ? Nov 19, 2011 18:01 |
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Phanatic posted:Tires exploding following a rejected takeoff test of the A340 (basically a worst-case test: maximum TOGW, worn-out brakes, speed at V1): So the Boeing handled that a lot better than the Airbus. Hopefully the Airbus folks learned a few things about tires from their expensive looking test failure (presumably they did since the airplane was certified).
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# ? Nov 19, 2011 19:31 |
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The Locator posted:Hopefully the Airbus folks learned a few things about tires from their expensive looking test failure (presumably they did since the airplane was certified). The worst thing about that Airbus test was the bad communication with the fire crew. It's okay for the test aircraft to be damaged, that's why you're doing the test, to see what goes wrong if anything and then correct the design. But that poo poo could have gotten someone killed.
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# ? Nov 19, 2011 20:41 |
The Locator posted:So the Boeing handled that a lot better than the Airbus. Hopefully the Airbus folks learned a few things about tires from their expensive looking test failure (presumably they did since the airplane was certified). I read that in that test some thermal relief plugs failed to work right. They are supposed to deflate the tires in a controlled manner if the temperature gets near where the tires could burst. Obviously they didn't in that video.
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# ? Nov 19, 2011 21:00 |
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Phanatic posted:I was driving back home one night on I-95, about 2 in the morning, and was passing an 18-wheeler just as it had a blowout. It sounded like someone put a 12-gauge next to my ear and fired it. Scared the poo poo out of me until I looked over at the truck and saw the trail of sparks from the shredded tire, and even then it took probably about 10 minutes for the adrenaline to metabolize. That's pretty awesome how the 747-8 automatically deflates the tires to prevent a blowout.
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# ? Nov 19, 2011 22:09 |
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CaptBubba posted:I read that in that test some thermal relief plugs failed to work right. They are supposed to deflate the tires in a controlled manner if the temperature gets near where the tires could burst. Obviously they didn't in that video. They didn't, but the tires actually performed to spec. The Goodrich-Messier *wheels* were the failure point. It's the Michelin NZG (Near-Zero-Growth) tire that was designed for the Concorde. It's pretty impressive when the tire can withstand greater pressures than the wheel its mounted on can. Bonus 777 test: https://www.youtube.com/watch?v=wXpjBxD0Rhg
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# ? Nov 19, 2011 22:10 |
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Just got replacing the motor mounts on my wife's 2002 Mazda Protege... Let me just say that this one was the worst offender..
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# ? Nov 19, 2011 23:22 |
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Both from the same truck:
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# ? Nov 19, 2011 23:23 |
Shroomie posted:Both from the same truck: What is this and why is there hair in it?
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# ? Nov 19, 2011 23:28 |
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Muffler, fiberglass.
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# ? Nov 19, 2011 23:36 |
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Paul Boz_ posted:Just got replacing the motor mounts on my wife's 2002 Mazda Protege... Let me just say that this one was the worst offender.. I did the mounts on my 99 Altima about this time last year; one looked just like that. And now it's vibrating again. Same mount that looked like that last time is in bad shape again. Can Duralast make ANYTHING right? Though at least that mount is the easiest one to replace..
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# ? Nov 20, 2011 10:32 |
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A cool way to fix your tire is by using duct tape [img-I_forgot_to_take_a_picture_with_the_tape_still_on.jpg] to cover up the wood glue thats holding the wadded up duct tape sticking through the hole in the sidewall. After going through all these steps you will still need to buy a new tire and let everybody at the shop laugh at you behind your back.
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# ? Nov 21, 2011 01:38 |
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Paul Boz_ posted:Just got replacing the motor mounts on my wife's 2002 Mazda Protege... Let me just say that this one was the worst offender.. Ouch, I've got an 03 Mazdaspeed, I've been in that boat. Did you have fun with the rear mount?
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# ? Nov 21, 2011 07:08 |
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Fucknag posted:Ouch, I've got an 03 Mazdaspeed, I've been in that boat. Did you have fun with the rear mount? gently caress you. About as much fun as punching myself in the dick.
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# ? Nov 21, 2011 07:36 |
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Bang Me Please posted:A cool way to fix your tire is by using duct tape It held for a long time, not just to the tire shop. Pretty sure he drove it like that for a couple weeks.
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# ? Nov 21, 2011 23:13 |
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Paul Boz_ posted:gently caress you. About as much fun as punching myself in the dick. what did you end up using to raise the engine?
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# ? Nov 21, 2011 23:16 |
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Since we seem to be on the subject of tires. Here's a spectacular tire blow out at 180 mph. http://www.youtube.com/watch?feature=player_embedded&v=TxR7VaukwIU From another angle with bonus 911 lift off oversteer. http://www.youtube.com/watch?feature=player_embedded&v=7KtblpNXE1w
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# ? Nov 22, 2011 08:10 |
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Its amazing he didnt put that in to the wall...
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# ? Nov 22, 2011 08:25 |
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Left Ventricle posted:A neighbor did this on his '89 Grand Marquis a couple years back: Hey that's that fiberglass stranded adhesion tape. I may or may not have used that stuff to replace rotted out sections of the windscreen frame lip on my beetle.
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# ? Nov 22, 2011 08:44 |
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Aurune posted:From another angle with bonus 911 lift off oversteer. Am I seeing the change in air pressure suck the windscreen out in this one?
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# ? Nov 22, 2011 23:11 |
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Heres something that just happened. Helicopter crashes on a live camera feed. http://tvnz.co.nz/national-news/raw-video-helicopter-crashes-in-viaduct-4561143 It was lucky there was a newscrew recording it, no one was injured thankfully.
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# ? Nov 22, 2011 23:32 |
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jammyozzy posted:Am I seeing the change in air pressure suck the windscreen out in this one? Yep.
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# ? Nov 22, 2011 23:33 |
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Wibbleman posted:Heres something that just happened. HOLY poo poo. why is there a loose cable just flopping around near the rotors? why is the pilot not wearing a harness or helmet?
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# ? Nov 22, 2011 23:41 |
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Wibbleman posted:Heres something that just happened.
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# ? Nov 23, 2011 04:49 |
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Wibbleman posted:Heres something that just happened. Anyone have any insight into what cause the large bang and the tail/rotor to fall off?
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# ? Nov 23, 2011 04:58 |
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I'm not sure if he caught a cable or just tried to lift something too heavy. The entire airframe seems to have failed though, so my bet is on too heavy.
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# ? Nov 23, 2011 05:09 |
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Its hard to say from just the video, it was actually zoomed in a little too much. I can vaguely see what looks like a steel cable somehow get wound up in the main rotor, which promptly rips the engine free of its mounts, which the broke the shaft that runs the tail rotor. The uncontrolled shaft probably broke the tail off. My guess is that one of the securing lines from the tower piece he just lifted came loose from the wash of the heli, and whipped into the main rotor. Edit: One further review, you can see the unsecured cable waving around the tower before the rotor grabs it, just in the first play though, not the slow motion one. mutt2jeff fucked around with this message at 05:16 on Nov 23, 2011 |
# ? Nov 23, 2011 05:13 |
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# ? Mar 29, 2024 16:14 |
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The pilot seemed to be looking at it (or at least aware of hazards in that direction).
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# ? Nov 23, 2011 05:20 |