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Glass & Spins
I just completed a phenomenal spin course. It was great!!
However, during the ground work, I was shown a video from the back-seat of an RV-8 with a glass display ...which CLEARLY lagged big-time behind the recovery. The aircraft was back level, blue sky up and the display still showed it to be upside down! I'm curious for those of you that have glass and spin your aircraft ..is this a "normal" situation .. I haven't tried my GRT AHARS yet ... for such a lag for the display to catch up. I told the instructor I'd research with the experts. Thanks... DWS RV6-A N142DS "Nerdgasm" |
Hi there, yes, it's pretty normal for this to happen in my airplane. I have dual Dynon Skyview D700 displays. The PFD takes a few seconds to come back to reality after a spin or other aerobatic maneuvers.
To me it's a non-event because my attention is 99.9% outside the window anyway. I'm not the least bit concerned because the ADAHRS always catches up later, and you can't damage it by flying aerobatics. I would MUCH rather have glass than gyros when doing aerobatics. I hope this helps. |
Garmin does not show precession
I have the Garmin G3X. I spun my -8 quite a bit. I've never seen any precession at all. In this video you can barely make out the screen and it is indicating the correct attitude. The motor quit but the attitude was still good
https://m.youtube.com/watch?v=W4BH2tp_e2Q |
My experience is the same as Gash's. The Dynon ADAHRS looses it's marbles pretty quickly. I think the Garmin equipment is probably a notch or two above Dynon in this respect.
Even a roll or two will throw the Skyview out of whack. Not entirely confidence building. |
Glass IFR
So if you're flying IFR with glass and you get into an upset condition what do you do?
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That's what I'm thinking. Night or IFR and the autopilot or something else creates an upset. Turbulence, any number of scenarios. Spatial disorientation.
Mistakes happen and one should have a fighting chance to correct the situation. I think this is a big deal. Very interesting. A thread of its own in the Safety section. All should be advise. |
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1. Cross-check, 2. Interpretation, 3. Aircraft control. If there's a problem with the glass, you'll find it during step one. If the glass has gone wonky, revert to standby instruments (you do have those, right?) until glass regains its marbles. |
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One possibility (I might be blowing smoke here) is that if the vibrating gyros in the glass cockpit get confused, the trusty old turn coordinator will be too stupid to get tumbled and will still be usable -- if you can do a partial panel extremely unusual attitude recovery. It would be fun to go try that all out, but my G3X airplane is not good for spins, and my surgically repaired spine would probably complain a lot on the Gs you could pull in a spin recovery. On the other hand, if you want to see what your gyros will do, get a qualified person in the other seat (if you're not) and do some frisky maneuvers and see what the instruments do, and look for the chevrons and other symbols when bank and roll angles get big. Just be careful not to overspeed the RV when you're doing those things. Ed |
Pilots of yesteryear didn't worry much about spinning gyros. They employed another method said to have a favorable outcome. It's called the "whiskey bottle and duck" method. When caught short of fuel and above a solid overcast... drink the bottle down to half full and use that for attitude and throw out the duck while following him down in a full on spin. We don't need no stinkeen gyros.:)
Cheers, Hans |
My wife's grandfather was a B-25 pilot in WWII. He told me a story about the whiskey and duck method! Funny that you should bring this up!
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