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- Newsgroups: rec.models.rc
- From: bob@harrier.demon.co.uk (Bob day)
- Path: sparky!uunet!pipex!demon!harrier.demon.co.uk!bob
- Subject: Re: Tachometers
- Distribution: world
- References: <sfM8dMa00YUoAp54U6@andrew.cmu.edu>
- Organization: Harrier Softnet Ltd
- Reply-To: bob@harrier.demon.co.uk
- X-Mailer: Simple NEWS 1.90 (ka9q DIS 1.19)
- Lines: 31
- Date: Sat, 23 Jan 1993 16:10:56 +0000
- Message-ID: <727805456snz@harrier.demon.co.uk>
- Sender: usenet@demon.co.uk
-
-
- >Actually, regarding calibrating to an electric light wouldn't that be
- >1800 rpm for a two blade prop or 1200 for a three blader?
- >
- >Also, you would need a fluorescent light or some other light that
- >flickers more than an incandescent light.
- >
- >Just a thought...
-
- >Wrrooonnngggggggg... An incandescant lamp running on 50 Hz mains actually
- flashes 100 times/sec. The sine-wave goes both posative and negative peaks
- in ecah cycle, ie 100 flashes/sec. Multilpy by 60, gives 6000 flashes per
- minute.. So on the two blade setting it should read 300 ( 3000rpm ) and on
- three blade 200...
-
- I guess your side of the pond where you run at 60Hz it would read 360 and 240.
-
- I'm not an expert on flourescant lights, (or much else really) :-) but they
- run via some really high voltage gizmo which makes the gas in the tube
- flouresce constantly....
- >
-
- cheers
-
- bob
-
- Harrier Softnet Ltd tel +44-734-731181 I'd rather be playing
- Ivanhoe Rd fax +44-734-734546 with my chopper
- Finchampstead email bob@harrier.demon.co.uk O / __________
- Berkshire -|-<> /\======O
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