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  #11  
Old 07-02-2021, 02:39 PM
Karl Kistler Karl Kistler is offline
 
Join Date: Oct 2017
Location: Fehraltorf, Switzerland
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Quote:
Originally Posted by NinerBikes View Post
Is that on display on both Dynon and Garmin glass EFIS's?
I have a Dynon HDX, Garmin??
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  #12  
Old 07-02-2021, 02:56 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by NinerBikes View Post
Is that on display on both Dynon and Garmin glass EFIS's?
Quote:
Originally Posted by Karl Kistler View Post
I have a Dynon HDX, Garmin??
Use of the % throttle position value is a standard operating parameter for the 912iS engine, so both the Garmin and Dynon avionics systems have it incorporated into the displayed info.
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  #13  
Old 07-02-2021, 03:40 PM
fehdxl fehdxl is offline
 
Join Date: Mar 2005
Location: Bellevue, NE
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Some addition good nuggets of information in the Rotax operating manual.

Fly safe!
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Last edited by fehdxl : 07-02-2021 at 03:45 PM.
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  #14  
Old 08-24-2021, 07:11 PM
edmondthx1138 edmondthx1138 is offline
 
Join Date: Jun 2021
Location: Tucson
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My RV-12iS has Dynon HDX and I am not able to determine how to if the generators switch over at 2,500 during engine start. I've seen it on the G3X.

Anyone figure this out?
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  #15  
Old 08-24-2021, 07:29 PM
Bob Y Bob Y is offline
 
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Location: Piedmont, SC
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If I understand your question correctly, when the ammeter goes from negative (discharging the battery) to positive, you’re on the generator. You should notice your HDX getting a bit brighter too.
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  #16  
Old 08-25-2021, 05:23 PM
Amadeus Amadeus is offline
 
Join Date: Nov 2020
Location: Basalt, CO/Lexington, KY
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Quote:
Originally Posted by rvbuilder2002 View Post
We have found that in warmer ambient temps, 35-40 percent works well to get a nice smooth start that doesn't jump to an excessively high RPM.
After reading this thread I decided today to attempt a start at 40% throttle. Before today I always turned the key with the throttle at 50% immediately reducing RPM to 2300 - 2500 which leaves the GEN A/GEN B still needing performed. When starting today I still had to reduce RPM immediately but not by nearly as much.

These hot summer days and for hot starts I will turn the key with throttle at 35%. I always learn something reading vansairforce forums!
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  #17  
Old 09-01-2021, 05:16 PM
JwWright57 JwWright57 is offline
 
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Location: Charlotte, NC
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Quote:
Originally Posted by Bob Y View Post
If I understand your question correctly, when the ammeter goes from negative (discharging the battery) to positive, you’re on the generator. You should notice your HDX getting a bit brighter too.
Thanks Bob. I had that question also. Maybe the POH should just say “if the amps are positive it’s switched over”
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  #18  
Old 09-01-2021, 08:03 PM
NinerBikes NinerBikes is offline
 
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Quote:
Originally Posted by edmondthx1138 View Post
My RV-12iS has Dynon HDX and I am not able to determine how to if the generators switch over at 2,500 during engine start. I've seen it on the G3X.

Anyone figure this out?
Let your oil pressure get up around 55-60 psi or more at 2000 to 2200 rpm first, for 5-10 seconds, then proceed to 2500+ RPMS... It's a 2 step procedure.

The A and B lane switches lighted, once over 2500 rpm for 5 seconds, CHANGES from Lane B lit to Lane A lit, on your switch panel, not on the glass EFIS. That tells you you're charging at a positive rate and on the alternator.
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Last edited by NinerBikes : 09-01-2021 at 08:06 PM.
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  #19  
Old 09-02-2021, 08:47 AM
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jrtens jrtens is offline
 
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Quote:
Originally Posted by NinerBikes View Post

The A and B lane switches lighted, once over 2500 rpm for 5 seconds, CHANGES from Lane B lit to Lane A lit, on your switch panel, not on the glass EFIS. That tells you you're charging at a positive rate and on the alternator.
NO! Your lane lights remain unlit. (They are fault lights) The only indication is a significant jump in amps as your battery begins to charge. For example, with the Earth X battery, my amps usually go up to around 16 to 18 amps. So while you are advancing the throttle, you should be looking at the ammeter for this jump.
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Last edited by jrtens : 09-02-2021 at 09:20 AM.
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  #20  
Old 09-02-2021, 09:25 AM
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greghughespdx greghughespdx is offline
 
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Location: Aurora, OR
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Quote:
Originally Posted by jrtens View Post
NO! Your lane lights remain unlit. (They are fault lights) The only indication is a significant jump in amps as your battery begins to charge. For example, with the Earth X battery, my amps usually go up to around 16 to 18 amps. So while you are advancing the throttle, you should be looking at the ammeter for this jump.
This is correct. The Lane A and Lane B lights are *fault* lights only, and neither should be lit in normal operations, including during the startup sequence and while the generators kick in. The ammeter is the thing you need to keep an eye on.

If one or both lights are ever lit or flashing, refer to the RV-12iS POH for a list of what the combination of lights means.

From RV-12iS POH 7-12:

7.7.2 ROTAX 912 iS GENERATOR TRANSITION
After engine start, the Rotax 912iS generators will supply
power to the engine computers but not the main bus.
After the engine speed exceeds approximately 2,500
RPM for a few seconds the K1/K2 relay shown in Figure
7-7 will switch, Generator B will begin supplying power to
the main bus and Generator A will supply power to the
engine computers. This transition will be noted on the
Gen Amp Meter (Shown on the EFIS screen)

A table explaining possible Lane Fault light indications and related actions to take are in the POH, in Section 3-4.

Please don't operate the aircraft without being familiar with the contents of the POH.
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Last edited by greghughespdx : 09-02-2021 at 10:32 AM.
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