An appropriate (but small) Group already exists: http://tech.groups.yahoo.com/group/Aerospace_Hardware_Collectors_Group/
-John ======================= > Yeah I'd join a gyro-nuts group. I have a shelf full of weird gyros, a > stable > platform, other gyro stuff. I made a little power supply to make 28 volts > 3 > phase 400 Hz, found it in an app note, for running a set of three tiny > rate > gyros I picked up. I'll go dig it out and let you know. > > Peter > > On 3/27/2013 4:40 PM, Bill Ezell wrote: >> Well, I can come up with something topical, read on. :) >> >> I saw a 'Bendix yaw-rate gyro' on FleaBay recently for $14.50. Of >> course, I >> had to buy it. >> >> What I got was the yaw-rate gyro package from a Northwest Airlines DC-10 >> that >> was stripped for parts around 2000. The gyro included the pull tag with >> tail >> number, the license number of the A&P mechanic that pulled it, and some >> other >> cool stuff. >> >> What it turned out to really be is two gyros with two sets of >> electronics in >> one box about 6" x 2" x 5" box, all vintage '80s or so. Even better, >> it's a >> strapdown system. The actual gyro wheel is about the size of your >> thumbnail. >> I've just started tracing things out, and I've gotten the gyros to spin >> up. I >> really love mechanical gyros for some reason, too bad there's not a >> gyro-nuts >> group. I'm going to have great fun getting the package traced out and >> running. >> >> So, to be a bit more topical, the package of course needs 28V 400Hz for >> the >> gyros, 28VDC for something, and +/-15V for most of the electronics. >> >> Question - anyone figured out some clever solution for the 400Hz power? >> I >> faked it with a signal generator and power amp, but that's a bit bulky. >> I'm >> thinking I'll use one of the class-D amp ICs and a simple op-amp >> phase-shift >> sine generator. >> >> Topical in a more abstract way, strapdown systems really are very >> interesting. >> They require precise integration of the rate output over time to derive >> velocity and position, and really weren't practical until the 70's when >> small >> enough computers existed to do the requisite calculations. (I worked on >> the >> nav system for the Trident missile back in my Draper Labs days). >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.