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Altitude hold... (Read 382 times)
Oct 9th, 2017 at 8:18am

BlueCH750   Offline
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Low and Slow

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In Phase I flight testing and starting to inflight tune the AP servos.  Using the Dynon produced flow charts for  inflight tuning.  Two SV32 servos installed on STOL CH750 along with AP control panel.  In simplified mode TRK/ALT along with HSI/ALT seem to hold altitude OK (smooth air).  When switching to expert mode, airspeed hold seems to do quite well (smooth air).  Coming out of the IAS mode into ALT hold, the autopilot will start deviating and correcting either side of the altitude until it seems to give up and drift either way from the engaged altitude.  Could this be related to my ALT bug?  All thoughts appreciated....thanks!
« Last Edit: Oct 9th, 2017 at 8:19am by BlueCH750 »  

STOL CH750 - The mighty "Sky Turtle"
Dual Dynon 7" classic display and two axis A/P
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Reply #1 - Oct 9th, 2017 at 8:22am

RayInGA   Offline
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I'm not sure it is related to your problem but in Expert mode, when you change the ALT bug, you then have to tell the AP to go there via the  up or down button. Subsequent pushes will increase or decrease the rate of descent or climb.
 

Ray Eaker
RV-7A flying since 27 Jan 2017
Dual Skyview 1000T with all available Dynon VFR goodies
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Reply #2 - Oct 9th, 2017 at 8:28am

BlueCH750   Offline
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Thanks Ray, I did not glean that from the literature, will give it a try and see if it "helps" the autopilot find it's way!  Roll Eyes
 

STOL CH750 - The mighty "Sky Turtle"
Dual Dynon 7" classic display and two axis A/P
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Reply #3 - Oct 9th, 2017 at 4:06pm

Dynon Avionics   Offline
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Also, confirm that you're actually in altitude hold mode. Once you've transitioned to altitude hold mode in expert mode, that altitude being tracked is in the AP status area, but the bug itself is then freed up so that you can select another altitude to go to once you initiate a climb or descent via either the up, down, or VS/IAS mode buttons.
 

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Reply #4 - Oct 10th, 2017 at 2:13pm

BlueCH750   Offline
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OK, thanks Dynon, will have a chance to further flight test later this week.  Smiley
 

STOL CH750 - The mighty "Sky Turtle"
Dual Dynon 7" classic display and two axis A/P
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