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VAF Forums (https://vansairforce.net/community/index.php)
-   RV-12/RV-12iS (https://vansairforce.net/community/forumdisplay.php?f=73)
-   -   Prop RPM? (https://vansairforce.net/community/showthread.php?t=140747)

RFSchaller 08-10-2016 09:56 PM
I used to own a Yak-52 that haD a gear box on the prop (PSRU). The tach read in % of max RPM so there it was pretty intuitive.

dbhill916 08-10-2016 11:19 PM
Quote:
Originally Posted by rvbuilder2002 (Post 1102293)
I agree. I jump back and forth between Lyc powered RV's and the RV-12's all the time. You just get used to it.

But to answer your question, the tach sensor for the Rotax is on the engine crankshaft, so the only way to change the reading to prop RPM would be to add a sensor to the gear box/prop shaft or get the manufacturer of the EFIS/EMS to write some special software code to divide the engine speed value by 2.43.
It looks like there is not any code in Skyview to be able to perform the division and display it. That was really all I was looking for.

thanks all,
-dbh

Mitch757 08-11-2016 04:58 AM
The Diamond Katana as originally built only indicates prop rpm. I've flown one a few times but don't know just how this is accomplished.

Walt 08-11-2016 06:04 AM
Not sure if this would work and I've never used it but G3X offers a custom RPM selection:

Custom: This option allows the installer to enter up to 8 points of frequency-to-RPM calibration. The input accepts frequency values up to 1 kHz. This input supports any RPM sensor that has a known frequency output (up to 1 kHz). This input also supports RPM readouts that display in percent instead of RPM.

rvbuilder2002 08-11-2016 08:14 AM
Quote:
Originally Posted by Walt (Post 1102495)
Not sure if this would work and I've never used it but G3X offers a custom RPM selection:

Custom: This option allows the installer to enter up to 8 points of frequency-to-RPM calibration. The input accepts frequency values up to 1 kHz. This input supports any RPM sensor that has a known frequency output (up to 1 kHz). This input also supports RPM readouts that display in percent instead of RPM.
Thanks Walt
My comment was in the context of Skyview and AFS. I am not very familiar with G3X.


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