After flying two (arduous) 20km FPV flights, I was thinking it would be fantastic to have a mode that would keep the plane heading, altitude and speed. FBW & Stabilize holds the plane level, but it drifts. Auto requires I pre-load waypoints.
This would be a fantastic feature for the FPV users. What do you guys think?
That would be perfect!
yes, that would be fairly easy to do. This is probably best done as a new HEADHOLD mode.
The heading to hold would be taken from whenever the aileron and rudder are released back to zero (within the deadzone). So if you don't touch aileron and rudder then it would hold heading. As soon as you start using aileron or rudder it would fly like FBWB until you let go of aileron and rudder again, at which point it would again lock heading. This would allow you to use aileron or rudder to adjust the heading you are holding, and be completely hands free for longer runs.
Altitude and speed would be like FBWB, with the same controls.
If you like the idea please create an issue for it in the issues list and I'll implement it when I get a chance.
Perfect, Andrew - issue #438 created.
That would be a game changer for me (and I'm sure many others) - it's also a feature no other hobby level system has.
Paul and I discussed this a bit tonight, and one question we're trying to work out is if it should be heading hold, ground course hold or ground track hold. Each would behave a bit differently.
Heading hold would hold compass heading. So if the wind changes you'll change ground course and ground track. Ground course hold would hold GPS ground course. That will drift less in wind, but it will drift to some extent. A ground track hold would draw a virtual line through your ground course at the time you let go of aileron and rudder, then would follow that track (ie. doing cross-track correction to stay on that line).
I'm inclined to go with ground course hold, as it's easy to do, and I think it would be good to fly. Point the nose at the nice mountain in the distance then take your hands off the sticks. You'll need to correct a bit occasionally, but not much, and if a wind comes up it will crab as needed to keep the ground course.
What do you think?
I'm still in the test & tune phase with my Skywalker, but this sounds like an excellent feature. It would free up the FPV'er to sightsee on the way to that mountain.
Thanks to Hein for requesting and thanks to Andrew for developing the solution.
Tridge, that's EXACTLY what I had in mind - point the aircraft in the direction of a landmark, and sit back and enjoy the flight for a bit in stead of worrying about flying. So ground track would be fantastic to have, crab and all.
It would really revolutionise my (our?) flying. Thanks for taking an interest.
Same page, Trung - so many times I'm surprised at what I missed after looking at a recording of my flight while I was just ensuring that I'm holding course.
What should we call this new mode? Some suggestions:
Any other ideas?
The reason I want it to be a separate mode, and not just change FBWB, is that for photography with a directly down-facing camera and no gimbal you don't want the plane rolling its wings. The current FBWB mode is ideal for that.
For people flying FPV I think they'll just use the new mode and not have FBWB setup on their mode switch at all.
I was going to say Cruise but iskess beat me to it! :) HeadHold is my second choice, because it's self explanatory.
Agreed - as an FPV pilot I would only have 4 modes - Manual, Cruise, RTH, Loiter. Cruise replaces Stabilize & FPB.