Jerry, Thanks for the info!
I think I glommed rigid and semi-rigid together. Memory is turning to mush. http://www.airspacemag.com/flight-today/how-things-work-ground-resonance-94660854/ "The only rotors that can produce ground resonance are those with three or more blades." I googled a bit to try and find that video. I thought it was a MASH helicopter. maybe it was a brantly or a sikorsky 300. Couldn't find anything that looked like either one. Ah well. Won't be able to afford to fly anytime soon anyway. Greg > They used the Bell OH-13 (model 47) 2-bladed helicopter in M.A.S.H. The > "killer Hillers" were two-bladed (semirigid) with wooden blades. I used > to fly the Hiller OH-23 in flight school. Not only were they semirigid, > but they had paddles connected to the cyclic and no hydraulics. The Bell > had hydraulics. > Bell OH 23 > *http://tinyurl.com/n5bmz6n > > *Hiller OS-23 Model 360 > http://www.youtube.com/watch?v=TRDJ9oyjcMc > > On 02/03/2014 12:13 PM, Greg London wrote: >>> Most helicopters used by news organizations ... >>> Depending on whether they are semi-rigit or fully >>> articulated, each blade has its own independent angle of attack,. >> Most news helicopters are Bell Jet Rangers with 2 rotor blades. >> As far as I know, any helicopter with 2 rotor blades is rigid. >> >>> I have seen helicopters go into vibration on the >>> ground and destroy themselves. >> I've only seen video. It was an older Hiller "killer" model >> (a la "M.A.S.H.") with 3 rotor blades. >> >> I've got a chunk of time on a Robbie. >> Someday, I'll splurge and get an hour or two on something >> with a turbine. If I win the lottery, jetpack. >> >> As for the article, interesting way to pack data in to the audio. >> I wouldn't have been able to reverse engineer it the way the >> guy writing the article did. >> >> Greg >> >> >> >> > > -- > Jerry Feldman <[email protected]> > Boston Linux and Unix > PGP key id:3BC1EB90 > PGP Key fingerprint: 49E2 C52A FC5A A31F 8D66 C0AF 7CEA 30FC 3BC1 EB90 > > > _______________________________________________ > Hardwarehacking mailing list > [email protected] > http://lists.blu.org/mailman/listinfo/hardwarehacking > -- _______________________________________________ Hardwarehacking mailing list [email protected] http://lists.blu.org/mailman/listinfo/hardwarehacking
