INAV 7 Tailsitter progress - Theer twin

Tailsitter takeoff, transition and wing mode all work OK, but not stable in a hover for more than a few seconds. Struggling to hold vertical orientation and some oscillations when switching out of wing mode at speed.
Need help with the quad pids that include elevons.
Matek F765-WSE no GPS
Latest Diff file - drive.google.c...
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[@johnchandler4565]

Well done Andrew, I'm watching progress with interest. I have a few different BNF tail sitters (with proprietary flight controllers and firmware) that work superbly, however, I'm keen to see this working on INAV. Yep, it took me a few failed takeoffs with the BNFs to realise you have to punch it initially to get off the deck.

[@ronygarcia8079]

When you set everything up it would be a giant leap for man kind “VTOL Development” ,I hope you teach us how to set everything up, keep up the good work 💪🏼

[@3v1Bunny]

working on this atm with a penguin. I got it to a pretty ok hover now. Still working on the transition in higher winds.

[@AndrewNewton]

Yes penguin is tail sitter ready.

[@spencerboaz2385]

It goes from hover to wing good . I can only guess at how my landings would lol . Have a blessed day my friend .

[@GroundControlRC]

That's brilliant! When you have it fully tuned it's going to very cool indeed ;-) Hum.....looking through my parts bin for dual tractor motors.

[@theoztreecrasher2647]

Interesting to watch your experiments with this 1, Andrew. Our old XK X520 versions of the same set-up are difficult to fly in the bi-copter mode in any wind. Only really possible to get control by lining up the wing with the wind direction and using the diff thrust for direction control. Also coming back from horizontal to vertical requires just over 1/2 throttle or the flight controller can get its knickers in a twist. Great little toy though and (most importantly for us Old Farts) tough as Hades! 😉😊

[@tonytruelove3576]

..Great concept, not seen this "tail sitter" before, think I've been living under a bush! So much technology now, just got into fpv, with my Phoenix and elec Longshot, with a screen not goggles, glasses and short sight make for a hard to find model once the goggles are removed. Think I'm gonna buy a simple park flyer, like volantex Ranger, to check out stabilized flight in windier, not too much, when I can't fly my 1 MTR dlg on the cricket pitch. Any other suggestions Andrew at a low price?

[@bomberaustychunksbruv4119]

I'd like to tinker with something like this later. I have a T1 vTol running well so far . . .

[@toastrecon]

I wonder how this compares with dRehmFlight? Check out the video: Taming the Tail-Sitter: Hover to Forward Flight Explained and he shows that he can make a tail sitter that transitions from hover to level flight and back to hover again.

[@AndrewNewton]

Wouldn't mind his coding skills!

[@toastrecon]

@@AndrewNewton yeah, no kidding! Maybe this year, I'll find the time to see if I can follow his build and programming instructions.

[@Deoclecio01]

Beautifull 👍🇧🇷🇧🇷

[@wackyack3165]

Andrew - when in VTOL, could you possibly have a 'vertical' C of G issue? In other words, when vertical the wing balance just wants to 'lean forward' ?

[@AndrewNewton]

Yes possible. I should also try pushing the CG back a bit

[@AerialWaviator]

Very nice VTOL experiment(s). Think as you noted, larger control surfaces might be required. Of the tail-sitters I've seen, ones using servos to pitch motor up/down seem to have better hover control. Tail-sitters using only flight controls, tend to have issues descending. Have to descend slowly, or the downward motion seems to cancel out prop wash over wing/controls, diminishing their effectiveness.

[@AndrewNewton]

Proving to be quite difficult to tune but fun trying

[@AerialWaviator]

Glad are having fun. :)

[@rjung_ch]

Cheers 👍💪✌

[@jasonstation]

Having similar issues with the Eclipson e-VTOL-1.

[@AndrewNewton]

Interesting

[@messybench974]

Nice video as always!! Have a question... what kind of radio do you recommend for inav, planes like this? Thank you

[@AndrewNewton]

Here's my blog post on the subject newtonairlines.blogspot.com/2024/03/best-radios-for-inav-2024.html

[@carlosjimz]

Thanks for all the information, its very helpful. i don't know how I ended up with with a flight controller Inav and ardupilot which is a lot of work, trying to make a large vtol fixed wing like the one here, I know of several toy grade VTOL that perform superb like sg f22 with a single rx/fc . Im looking for something simple for my application currently setting up speedy bee wing. I will try kk2 to see what happens. Any minimal vertical fc that support vector and differential on two motors , without the bells and whistles? Thanks

[@AndrewNewton]

Looks like you need a very light airframe with enormous control surfaces. I never improved the Tailsitter performance of this wing unfortunately. It takes off and transitions nicely but can't descend in VTOL mode. There are no simpler FCs that would do the job as far as I know.

[@MrZeek101]

Always a pleasure Sis Andrew I totally agree with the control surfaces If you have the space, hang your wing with some string and experement to see how balanced your aircraft is to see if its left or right side heavey

[@EnglishTurbines]

Its a safe way to takeoff as long as its calm.... Whats the difference between takeoff mode and level flight...?...Is it just elevon trim?...🤔😳🇬🇧

[@AndrewNewton]

Takeoff is Quad profile with board vertical plus elevons, level flight is just normal flying wing

[@EnglishTurbines]

@@AndrewNewton Thanks Andrew, it would seem the Penguin is the weapon of choice for this...🤔😳🇬🇧

[@AndrewNewton]

@@EnglishTurbines Yes, I might try with the Penguin.

[@TheRiddleOfSteel007]

I’ve been wanting to try this. Could you post your diff file?

[@AndrewNewton]

Yes, added to the description now.

[@TheRiddleOfSteel007]

Awesome! Thanks