I tripped over this on my suggested links and thought it might be of interest to the DIYD crowd. Fascinating to see an original Macintosh being used as a ground station!
Beautiful !!..... I wonder what those guys are doing now?
Hmm! APM mark .0001 Alpha
Literally just read a paper from Ilan Kroo the other day (tailless aircraft paper). Fantastic resource for people working on flying wings.
Makes you wonder how unstable our UAVs could be and still fly. Relaxed stability gives more efficient flight sometimes and a greater maneuver envelope potentially.
I have a couple of times been guilty of launching a plane in stabilise or FBWA mode that has been completely out of trim and flown around easily and then switched to manual and have it nearly crash before I can cut the autopilot in again. It is amazing (when you are dumb enough to do it :-)) what the APM will compensate for.
It would be fun to explore this Stephen, but I think there are two issues that might arise. Firstly the extra servo work might cost you flight time in mAh rather than L/D and secondly, (I think) you'd need a pretty reliable airspeed sensor to add in your stabilizing function which needs to operate all the time, not just in FBW and Auto modes.
Actually, I wonder if just by having an open-loop airspeed-vs-pitch trim function whether this would be enough to add synthetic stability without needing any high-speed feedback loops running. After all, this is all static margin is going you, isn't it?
Yep - they had an angle of attack sensor as well as this would be pretty critical. An accelerometer or magnetometer can only give you a pitch angle not one referenced to the on-coming airstream.
And if this is the same Steve Morris then he at least has done a fair bit since
You might need two and use the speed difference between them to estimate it. Mind you I could just take the Penquin out this week and move the battery back a bit and see how it goes. I also have a wing that is eventually getting an APM so it could be a good test.
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