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10-04-2012, 02:21 AM | #1 |
I wanna be Dave Join Date: Dec 2009 Location: San Francisco
Posts: 2,236
| The Z Torque Bike Crank-Breaking Laws Of Physics
Man, either these guys are really dumb enough to think that it works or they are trying to capitalize on other peoples stupidity. Quite hilarious, even after a few good explanations written in the comments by actual engineers cant convince these guys that they are wrong. Z-Torque Bicycle Cranks - Ride Faster ! Longer ! Easier ! by Jason Coment — Kickstarter |
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10-04-2012, 02:27 AM | #2 |
Rock Stacker Join Date: Aug 2012 Location: Spokane Wa
Posts: 55
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
Looks like an interesting idea, would love to see the studies that they did as well as some strength tests compared to a straight crank
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10-04-2012, 03:07 AM | #3 |
Rock Crawler Join Date: Feb 2007 Location: CoMo...Kickin it with Holmes Hobbies
Posts: 805
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
all that he achieved was to actually shorten the crank.
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10-04-2012, 03:47 AM | #4 |
Quarry Creeper Join Date: Sep 2010 Location: Deus est mortuus, logica obtinet.
Posts: 451
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
haha this is hilarious. i'm not worried about it, there is simply no way they will hit their $50k goal and all money gets refunded if the goal isn't met. it's just funny how terribly flawed their list of advantages is. the only advantage would be aesthetics. it looks kinda cool, but there is no real benefit to it. kinda like studded belts, they look different but the studs don't hold your pants up.
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10-04-2012, 04:04 AM | #5 |
Pebble Pounder Join Date: Apr 2007 Location: va beach
Posts: 171
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
Looks like something you'd see all polished up on a lowrider bike!
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10-04-2012, 06:46 AM | #6 |
RCC Addict Join Date: Feb 2005 Location: Crawlifornia Uber Alles
Posts: 1,146
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
Garbage. Especially with the square taper holes for the bottom bracket.
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10-04-2012, 07:20 AM | #7 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
Sheesh...... 1-I can't believe people think this is, "The way to go in the future". 2-I can't believe people are backing this. Then again, people here are constantly told they will need to use an external BEC for high torque servos in crawlers but yet try to prove everyone wrong. If these "bends" made any difference, it should also affect the way suspension links worked. Hmmm...maybe THAT'S why the top guys have great handling rigs!!!!! Now I have to go get longer links and bend them like pretzels......sigh..... These cranks "look nice" but I see no advantage other than to employ some people and make your wallet lighter. This is like saying, "I have color coordinated hi "C" LiPO packs, you need to spend 4x the money to get my packs!" and people saddle up & buy them. Oh, wait.......we already get that..... Was it P. T. Barnum?, "There's a sucker born every day!" PS, I like the typos in the company page. Not. Last edited by Charlie-III; 10-04-2012 at 07:37 AM. Reason: Added suspension link reference....LOL |
10-04-2012, 07:34 AM | #8 |
Scale Detail Engineering Join Date: Apr 2010 Location: Turtle Island
Posts: 5,573
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
ummm, I believe that's two 7's... not a Z. Dumbass!
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10-04-2012, 07:50 AM | #9 |
I wanna be Dave Join Date: Jan 2004 Location: Detroit
Posts: 3,583
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
Do people realize physics of a crank works point to point? All this did was put a shape into the crank itself. The crank point is still mount to mount which is still a straight line. |
10-04-2012, 08:26 AM | #10 | |
I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics Quote:
Torque = Distance vector cross Force vector You'd think with the word "torque" in the name of their product, they'd at least try to figure out what that means. Last edited by JeremyH; 10-04-2012 at 08:28 AM. | |
10-04-2012, 08:34 AM | #11 |
I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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10-04-2012, 08:37 AM | #12 |
Quarry Creeper Join Date: Nov 2006 Location: DeSoto
Posts: 206
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
Position Vector cross Force vector. I also believe we would need more than that. Position cross force gives the moment about a point; however, we want the torque about an axis. We would need the unit vector of the axis dot into the cross product of the position and force. This would give us the magnitude of the moment. Take magnitude of moment and multiply it by the unit vector of the axis for the Torque vector. Or the answer could be waffles. |
10-04-2012, 08:39 AM | #13 | |
I wanna be Dave Join Date: Jan 2004 Location: Detroit
Posts: 3,583
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics Quote:
Shape doesn't equal physics. | |
10-04-2012, 08:42 AM | #14 | |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics Quote:
Oooopppsss.....wrong question. As stated, the "design" looks cool but is worthless at a minimum, dangerous at the extreme. | |
10-04-2012, 08:50 AM | #15 | |
I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics Quote:
To increase the MOI, they would need to concentrate more of the mass of this crank toward the pedals....and even then it would only about double the MOI. I really think they are just throwing out terms that they don't know and hoping people will buy it... I like waffles. Last edited by JeremyH; 10-04-2012 at 08:53 AM. | |
10-04-2012, 08:56 AM | #16 |
Rock Stacker Join Date: Aug 2012 Location: Moreno Valley Ca
Posts: 52
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The angle must help with wind resistance, instead of a straight rod it now has a point which helps break through the on coming air.....:what: For some reason I see a middle aged man trying to stand on his pedals coming down a hill only to have it break at the bend and well im sure we can all se where that goes.... Distance from a-b is just that doesn't matter what bends you put in between. This is some funny chit. Some people.... Fat fingered from the phone- Corey |
10-04-2012, 08:59 AM | #17 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics |
10-04-2012, 09:22 AM | #18 | |
Quarry Creeper Join Date: Nov 2006 Location: DeSoto
Posts: 206
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics Quote:
I am not talking about moments of inertia. I am saying a moment of force that produces a turning effect or moment about a point. When I say moment it is interchangeable with torque. Moment in scalar form is simply Force times distance the same as torque. The process above holds true for finding torque about a specified axis. | |
10-04-2012, 09:33 AM | #19 |
RCC Addict Join Date: Feb 2005 Location: Crawlifornia Uber Alles
Posts: 1,146
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
These garbage cranks are just like skateboards from the 80's that had weird shapes and cut outs. They called them 'money bumps' and 'money shapes'. It's just for morons that want to buy something that looks different, no matter how poorly they perform. And the square taper bottom bracket has gone the way of the dinosaur. So even if the cranks were normal, they are still fuct!
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10-04-2012, 09:44 AM | #20 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Re: The Z Torque Bike Crank-Breaking Laws Of Physics
I'm not into bicycles in any way, shape, or form, but I keep thinking I've seen these or something like them before...
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