I have been trying to check how accurate my tacho is on my Avid speedwing Rotax 582 and I have reason to believe it maybe reading low! I have a GSC Tech 11 prop, pitch is 15.5 degrees to get the RPM correct which I think is a little coarse maybe as much as 1 degree! I do have an optical tacho from my model flying days which I will try but would like to install a digital one. I would appreciate any comments on the matter and any suggestions (polite) as to what I should do.
Regards John
on the market for a Tiny tach or equivalent!
How accurate is your Rotax 582 tacho?
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jangiolini
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How accurate is your Rotax 582 tacho?
John Angiolini
036444
036444
What about a car mechanics multi-meter with an HT lead probe on it?
Gunsons used do one with a ferrous clip on thingy that goes over an HT lead and it gives a digital RPM readout. Don't know if they still sell them.
Gunsons used do one with a ferrous clip on thingy that goes over an HT lead and it gives a digital RPM readout. Don't know if they still sell them.
Rob Swain
If the good Lord had intended man to fly, He would have given him more money.
If the good Lord had intended man to fly, He would have given him more money.
If you have a laptop, this is a superb piece of free software:
http://www.tunelab-world.com/rpmsound.html
It analyses the engine sound using the built-in mic, determines the fundamental frequency, and displays the corresponding engine RPM. Out of curiosity, I took my laptop for a walk while calibrating the tacho on my RV6 Lycoming and got bored after a couple of hundred yards (quiet country location apart from me)! I guess that means you could even use it on a nearby desktop PC if it has a mic.
The Rotax is presumably a lot higher revving but I don't think that would be an issue. It helps to set the approximate expected RPM as a "hint" to ensure it doesn't lock to a harmonic, as described in the instructions.
Absolutely brilliant, and the Price is Right, even for a Scotsman.
Alan
http://www.tunelab-world.com/rpmsound.html
It analyses the engine sound using the built-in mic, determines the fundamental frequency, and displays the corresponding engine RPM. Out of curiosity, I took my laptop for a walk while calibrating the tacho on my RV6 Lycoming and got bored after a couple of hundred yards (quiet country location apart from me)! I guess that means you could even use it on a nearby desktop PC if it has a mic.
The Rotax is presumably a lot higher revving but I don't think that would be an issue. It helps to set the approximate expected RPM as a "hint" to ensure it doesn't lock to a harmonic, as described in the instructions.
Absolutely brilliant, and the Price is Right, even for a Scotsman.
Alan