Something my primary flight instructor pointed out to me years...yea, decades ago. Haven't thought about it since then.
I expect you can do the same thing with an electric fan. Bill On Mon, Nov 29, 2010 at 1:53 PM, Mike Naruta AA8K <a...@comcast.net> wrote: > > Have you ever tried humming while watching a propeller? > The strobe effect is fascinating. > > My flight instructor thought that I was crazy until he tried it. > > > Mike - AA8K > > > > On 11/29/2010 09:51 AM, jimlux wrote: > >> >> if one has a voltmeter (or total power detector, like your ear), hearing >> low frequency beats at sub-1Hz is easy.. (anyone who has tuned an >> instrument by ear, or sat in a plane with poorly synchronized engines >> will know this) >> >> > _______________________________________________ > 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.