paul mcintosh

This is a useful item. I have the Cermark and it has been flawless for
around 7 years. Uses a 9v alkaline and can read RPM from a foot away in
bright light.

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com

tom

I recently bought a Thunder Tiger jobby for about £25.00. In good sunlight
work from about 6 inches, seems to produce consistent numbers and does both
2 and 3 bladed props. Runs off a 9V PP3. Happy with it for the money. Only
thing I have noticed it it doesnt work well under lights that have dimmer
switches on, why i dunno, but claims 3100 despite my zagi doing closer to
17K! But in natural light it faultless. Got it from Als hobbies, but dunno
if they are they cheapest place...

paul mcintosh

It won't work under artificial lights because they aren't a constant source.
They are actually flickering to the beat of the electrical frequency!

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com

normen strobel

Don't get the hobbico one. It runs on 4 watch batteries, and if you forget
to turn it off overnight, in the morning you have to buy new batteries.
About $14 worth. I did this twice before I ripped it apart and made a
connector so it would run off a reciever pack which I could recharge.

--
Normen Strobel
nstrobel@zoominternet.nospam.net

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paul mcintosh

3000 un the UK and other places outside the US. 3600 in the US.

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com

john duxbury

Isnt a way to check an optical tacho for accuracy to point it at a
flourescent tube?? It should read 3000 i believe.

John.

tom

good point kinds works out rightish. 50Hz x 60seconds 3000RPM! OOOPS *feels
kinda dumb * So according to that the Thunder tiger is at worst 3% off, I
can live with that kind of inaccuracy

paul mcintosh

I was referring to the fact that he couldn't read the prop RPM under
artificial light.

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com

carrell

In the US, 60HZ flickers 3600 times per minute [60 * 60]


Isnt a way to check an optical tacho for accuracy to point it at a
flourescent tube?? It should read 3000 i believe. John.
"Paul McIntosh" <paul@mcintoshcentral.com> wrote in message news:bisfae$6o0$1@titan.btinternet.com...

jnkessler

TNC makes the best tach on the market.

opinions will vary,
jk