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Autopilot Behavior On Takeoff (Read 506 times)
Aug 31st, 2018 at 2:36am

Richard Fazio   Offline
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I think this is normal, but I can’t figure out why. I’ve done it a few times and it puzzles me. On an IFR departure I set everything up before takeoff. Set radios, alt bug and course bug. Then I set the autopilot to heading and 800 ft per min up but the autopilot not engaged. This way on takeoff I can climb out and engage the autopilot when I want. But as soon as I start the takeoff roll the autopilot turns off, no heading an climb rate. No big deal, I just hit heading and turn it on but, why should it do that?
 

Richard Fazio
RV-6, Skyview 10"
AP, ADS-B, Xponder
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Reply #1 - Aug 31st, 2018 at 6:45am

airguy   Offline
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SkyView Flight Tester
Gods Country - west Texas

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You are ENGAGING the autopilot prior to takeoff?
 
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Reply #2 - Aug 31st, 2018 at 7:02am

Richard Fazio   Offline
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No, I am arming it. ready to go so I can engage once safely in a climb.

But once I take off it is no longer armed it just goes away like it was off.
 

Richard Fazio
RV-6, Skyview 10"
AP, ADS-B, Xponder
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Reply #3 - Aug 31st, 2018 at 2:17pm

skyview_user   Offline
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I love TopMeteo

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Richard Fazio wrote on Aug 31st, 2018 at 7:02am:
No, I am arming it. ready to go so I can engage once safely in a climb.

But once I take off it is no longer armed it just goes away like it was off.


IIRC this annoying "feature" was introduced with Rel. 14 or 15. It contradicts my philosophy "what can be done on ground should be done on ground".
 
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Reply #4 - Sep 5th, 2018 at 8:41am

DHeal   Offline
Junior Member
I love flying!
Santa Rosa, CA

Posts: 87
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I too have tried to do what Richard suggests -- set up the desired AP flight parameters prior to departure and then activate these AP parameters after lift-off.  Sure would be convenient if my SV could be advance programmed in this way.
 

EAA #23982 -- EAA Technical Counselor and Flight Advisor -- CFI-A&I
RV-12 E-LSA (SV w/ AP & ADS-B)   N124DH   Based at STS (Santa Rosa, CA)
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Reply #5 - Sep 5th, 2018 at 3:12pm

David Brown   Offline
Senior Member

Posts: 477
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Just a word of caution, you should not (read as SHALL NOT) climb in VS mode. You should use IAS for climbs.

My Instrument departure is set the heading bug, fly off the runway, as I accelerate through 120-125 knots, hit the IAS button (this captures it) and then if I want HDG/TRK or NAV I hit them.

Once they are armed and I confirm the FD is doing what it should, fly the FD and or engage the AP. Although I will usually hand fly the climb just to keep my hand in.

Hope that helps.
 
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