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seansimp925
User Rank
Iron
seansimp925
User Rank
Iron
Re: Could be a bumpy ride
seansimp925   2/29/2012 7:44:26 AM
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Myron Boyajian,

Fortunately for these guys, you are a member of the absolute tiniest porton of bicycle riders and your wants/needs are so wildly different than the average that ignoring you is the best thing they can do.

Cheers!

seansimp925
User Rank
Iron
Re: Great Mechatronics project
seansimp925   2/29/2012 7:36:30 AM
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"Catch on" is not quantitative enough for me.

These guys could easily build a better mousetrap than Landrider who currently sells over $50mm of these automatic shifting derailleur bikes every year despite having a terrible reputation online.

Customizing gear selection is easy once you have a microcontroller on board.

Keep up the good work fellows and don't let the "bicycle experts" get you down.  

roboto
User Rank
Iron
Re: Colorado's BBEs (Bright Buding Engineers)
roboto   2/27/2012 5:04:37 PM
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OK , Ozark. why did you post all of that? 

Most importantly we need to concentrate on the invention at hand created by three young men. They have more things to worry about than how to spell ohms or its meaning when in all caps.  Don't take away their thunder.  This is a brilliant idea and they have a working example.  Kudos.  Great job.

  

Rob Spiegel
User Rank
Blogger
Re: Great Mechatronics project
Rob Spiegel   2/21/2012 11:54:01 AM
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Interesting link, Curious. Seems it didn't catch on. Could be that cyclists don't mind shifting gears. That may be the rub with this gadget. It also could be that gear selection is very individual, each rider making somewhat different decisions. Manual shifting customizes gear selection.

curious_device
User Rank
Gold
Re: Great Mechatronics project
curious_device   2/18/2012 11:00:35 PM
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Then there's the all-mechanical version that was for sale in the late 1990's -

http://www.disraeligears.co.uk/Site/AutoBike_derailleurs.html

Rob Spiegel
User Rank
Blogger
Re: Great Mechatronics project
Rob Spiegel   2/16/2012 3:12:40 PM
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This is a great Gadget Freak in a number of ways. As well as the quality of the gadget, the presentation was great as well. The three guys turned in a terrific set of build instructions, photos, and code. This is one of the best I've seen.

Rob Spiegel
User Rank
Blogger
Re: Colorado's BBEs (Bright Buding Engineers)
Rob Spiegel   2/16/2012 3:01:10 PM
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I love that, Ozark Sage. OHMS! A nice peice of trivia when creating parts lists. 

Ozark Sage
User Rank
Silver
Re: Colorado's BBEs (Bright Buding Engineers)
Ozark Sage   2/15/2012 8:07:30 PM
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Ben, Bill and Matthew interesting. I am sure other readers have sufficently commented on your design so I should like to make a comment on your (or another's) parts list and the use of the word Ohm, [George Simon Ohm] derivation: unit of electric resistance equal to resistance of a circuit in which a potential difference of one volt produces a current of one ampere

A resistor listed in a parts take-off with the ####(number) or CCCC (Color) to call out in it's ohmic value; ohmically in ohmage as read from an Ohm meter readout is in ohms

The capitalized plural OHMS is normally reserved and NEVER used since it means On Her/His Majesty's Service,  I really don't care but, our friends the Brits' are proud of their English language and, they had Webster's first! So guys sack this trivel piece of information away in your head until you need to pass it on to another future engineerand.

Matthew Stout
User Rank
Iron
Re: Weight
Matthew Stout   2/15/2012 2:48:54 PM
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As Bill said, the added weight is very small. The servo motors are actually mounted where the water bottle holder was, so if anything it is lighter than having a water bottle there. And the weight on the handle bars is small, and it is not noticable for none racing situations. I was just reading an article about how (with some basic/simple approximations) every pound was about 6 seconds more on a 25 (or so) minute hill climb. The dynamics and drag will technically be effected by adding these components also, but it is very minor (not noticable) to anyone not racing.

Essentially, my point is that no the weight doesn't have an effect on this product for its application.

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