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Engine and rotor tach display problem. (Read 1113 times)
Feb 10th, 2014 at 1:11pm

ckurz7000   Offline
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I love flying!
Austria

Posts: 43
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I have a gyrocopter with a Rotax 914 engine. I get the engine tach off the TCU pin 13 and feed it to pin C37_34 on the EMS module, and all is happy. In addition, I also need rotor rpm displayed on the EMS page.

I connected the pulses generated by the rotor tach sensor to pin C37_35. In the .DFG file I added this:

     c37_p33/35_v2={
           valid=1
           name=ROTOR
           id=RPM
           alarm_type=SELF-CLEAR
           range={...}
}

Then I loaded the modified .DFG file via USB stick and went to the EMS screen editor, expecting to be able to place a new widget called ROTOR there. In fact, I found the new Rotor RPM widget but now the Engine RPM widget is gone.

On the Sensor Input Mapping page I see both RPM sensors on pins 32/34 and 33/35, respectively.

There must be someting fairly obvious I am missing. Can someone point me in the right direction, please?

Thanks, -- Chris.
« Last Edit: Feb 10th, 2014 at 1:14pm by ckurz7000 »  
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Reply #1 - Feb 10th, 2014 at 2:32pm

Dynon Support   Offline
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Chris,
As SkyView ships, it assumes the RPM inputs are the left and right mags from a single engine. It takes the higher of these and shows it as your engine RPM.

If you want to have two RPMs, we can handle that, but you need to take advantage of an undocumented feature (just because it is so rarley used).

In the same DFG file you were editing, find the line "RPM_POLICY" and change this from "MAX" to "SINGLE".

Now you should have two RPM widgets in the EMS layout.
 

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Reply #2 - Feb 12th, 2014 at 3:47am

ckurz7000   Offline
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I love flying!
Austria

Posts: 43
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Thanks, this indeed fixed the problem. As this is a useful feature for anyone wishing to monitor 2 independent tachs (i.e., a light twin, helicopter or, as in the case at hand, gyroplane) I suggest you elevate this to "documented" status.

Are there other such useful cheats worth mentioning?

Thanks again, -- Chris.
« Last Edit: Feb 12th, 2014 at 3:48am by ckurz7000 »  
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Reply #3 - Mar 14th, 2017 at 9:30am

SilverLight Aviation   Offline
New Member
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Still not documented. Whats the delay. We are using HDx in a gyroplane. Need the same, Rotax 912ULS engine RPM and Rotor RPM
 
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Reply #4 - Mar 14th, 2017 at 4:40pm

Dynon Avionics   Offline
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Posts: 12766
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As more of a "power user" feature, this doesn't fall into our normal setup menu system. If you want to monitor two RPMs, load the file attached to this post. Then, you'll be able to select the RPM inputs separately from within your pin mapping setup.
 

Please do not use Private Messaging on form to contact. For private support:
Email: support at dynonavionics dot com
Phone: 425-402-0433 (7am-5pm Pacific weekdays)
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