Love the idea of this simple VTOL setup. This is my first tail sitter build:
It's a variant of the Flite Test Mini Arrow. I flew it on the latest stable release of Plane yesterday which went well.
Today, I tried it with V3.8.0beta4 on Pix Racer and had some mixed results. Hovering with no control input was stable on about 50% throttle. Roll response was minimal, pitch was ok, yaw was mostly nonexistent but sometimes seemed to give random amounts of roll, pitch and yaw all at once! I could tell it wasn't going to end well on the first hover so tried a transition:
Cool! Tried to transition back but I have no instincts for how to correct this type of airframe. The controls seemed unresponsive except for throttle but after a certain amount of pitch over, the throttle also seemed to become unresponsive and down it went:
Looking at the logs, I don't think it was a radio problem. No damage. Tried again:
Similar results. Minor damage to the left engine nacelle. Retired to the bench.
I hope some kind person will give me advice on how to proceed. I've put the data flash log here:
My thoughts are that maybe the motor directions need to be reversed. Is that a critical factor for yaw control with this design? I made the elevons really big. In manual mode it's mega touchy yet in qstabilize there was almost no response despite the large deflections. Weird. Elevon mixing is set to 0.5 but behaves like 1.0 or 0.9.
If motor direction reverse doesn't help, I'll try moving the CG back a bit.
I hope this will be a good test platform as it's very quick to build. The wiring took much longer than the air frame which has a total cost of £5 in foam board plus a barbecue skewer and takes about 4 hours to build.