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HomeAircraftHelicopterHelicopter Main Discussion › Using a Tach to measure True RPMS
03-09-2010 01:39 AM  8 years agoPost 1

rrElite Veteran

Columbia, MD,USA

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Someone asked me how to do this so I made a video.

Although I typically may use my eagletre logger, I do this when I'm lazy. It gets me an idea of true RPM before doing any tweeking of throttle curves or to just confirm my motor calc entries were correct when running a new motor and/or pinion.

Watch at YouTube

03-09-2010 01:56 AM  8 years agoPost 2
Justin Stuart (RIP)


Plano, Texas

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Nice video. That's a lot safer than the way I've been doing it.

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03-09-2010 02:17 AM  8 years agoPost 3



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Couple of people I fly with have been using a tachometer program from their I-phone. It checks out accurate against a skytach optical tach and is pretty simple to use as well.

03-09-2010 09:29 AM  8 years agoPost 4



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You can also tach the tail rotor with a airplane tach, and then divide it by the gearing. The tail method is good for multiblade helis.

03-09-2010 04:32 PM  8 years agoPost 5


Fort Worth, Texas

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I am one who hates to barrow but over the years I have barrowed everyone elses Skytach. Personally I think the Skytach is a ripoff, it chops your eyelashes if you hold it too close to your eye, you have to take the batteries out of it after you use it otherwise it drains them and it just feels cheap. I finally broke down and got a Batam Helimaster II. Its $20 more then the skytach and well worth it, it feels solid and does alot more than just measure Heli blade RPM. Kick in that it comes with a built in rechargable battery makes it all the better.

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