 | | Sonar questions (technical ones!) —Skye Legon
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| | | Hello everyone, A few sonar questions (other than where to buy them): 1: The speed of sound has been widely quoted to be 0.9 ft/ms (274m/s), but my Physics text lists it as 343 m/s (at 20C/70F), which is about 1.13 ft/ms, or 25% faster. So why the (...) (27 years ago, 25-Feb-98, to lugnet.robotics.handyboard)
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| | | | | Re: Sonar questions (technical ones!) —MAR ERICSON
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| | | | | My sonar seems to be pretty accurate. I would notice a 25% difference. ??? Check your calculations. Maybe you missed something. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of (...) (27 years ago, 26-Feb-98, to lugnet.robotics.handyboard)
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| | | | | | | Gear Motors —Mike Downey
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| | | | | | I was wondering if anyone has a good source for fairly high quality, low cost gear motors that inteface well with the handy board. Right now i am using a cheap little, current hungry 3v toy bulldozer as a platform. I would love to find some nice (...) (27 years ago, 15-Mar-98, to lugnet.robotics.handyboard)
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| | | | | | | | Re: Gear Motors —John Vaughn
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| | | | | | (...) Check out Herbach and Rademan at www.herbach.com for surplus DC gearhead motors. They often have 6-24 volt, optically encoded motors for $20-$25 each. J.V. -- ***...*** * John Vaughn Phone: 315-781-3906 * * Dept. of Math & Computer Science (...) (27 years ago, 16-Mar-98, to lugnet.robotics.handyboard)
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| | | | | Re: Sonar questions (technical ones!) —Fred G. Martin
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| | | | Good questions!! (...) The polaroid number/widely quoted number is 0.9 MILLISECONDS PER FOOT -- or 1.11 ft/ms. hence the conversion matches! I think also I have this wrong on my HB sonar page! This confused me for a while too. (...) Yes, this is (...) (27 years ago, 26-Feb-98, to lugnet.robotics.handyboard)
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| | | | | | Re: Sonar questions (technical ones!) —Skye Legon
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| | | | (...) Yes! I have been working from your sonar page, but as a sanity check I checked the Polaroid sheet again. Whoops! At least we were both tripped up by it. I'm used to seeing the "speed of sound" (ft/ms) quoted, not the "slowness of sound" (...) (27 years ago, 26-Feb-98, to lugnet.robotics.handyboard)
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