Tach RPM check

[BoButt]

I am trying to open the archive of checking tachs with AC lights but get an error message
Suggestions
http://www.pilotsofamerica.com/forum/archive/index.php/t-42166.html
I

 

[BoButt]

I thought the link was unlinked. just sent to show what i was looking for

 

[GeorgeC]

Welcome to PoA, did you mean

https://www.pilotsofamerica.com/community/threads/fluorescent-tach-strobe.42166/

?

 

[Domenick]

Spring for $28 and just get one of these:
https://www.amazon.com/dp/B0006N72U2/

 

[Dana]

There's an app for that...

https://www.tunelab-world.com/tach

https://play.google.com/store/apps/details?id=com.realtimespecialties.enginerpm&hl=en_US&gl=US

 

[Stewartb]

Your mechanic probably has one of these or something similar. Borrow it and find out what your tach isn't telling you. https://www.aircraftspruce.com/catalog/topages/trutach.php

 

[Dan Thomas]

There's an app for that...
https://play.google.com/store/apps/details?id=com.realtimespecialties.enginerpm&hl=en_US&gl=US

Actuated by engine sound, not by strobing the prop. Pretty hard to calibrate that.

 

[Dana]

Actuated by engine sound, not by strobing the prop. Pretty hard to calibrate that.

It actually works pretty well. You have to know approximately what the rpm is and tell it, along with the number of cylinders, then it locks onto the appropriate part of the waveform it hears.

 

[Domenick]

It actually works pretty well. ...

In some planes, 50-100 rpm difference can be the difference between green zone and red zone. Get something you can check. The optical unit when pointed at a fluorescent light should read 3600. Mine reads exactly that.

 

[bkspero]

Or find a plane with a certified airplane with a primary digital tach and compare the result of the app with the panel tach reading. My experience with a similar Android app (Headspeed tachometer: https://play.google.com/store/apps/details?id=at.idsoftware.headspeedtach&hl=en_US&gl=US) is that it exactly matches the tach readout of my CGR-30P.