Redundant prop alignment idea

ArduPlane VTOL Plane
1

It really bugs me that my rear prop always stops perpendicular to the airflow. I know you can get aligning motors but they are large and expensive so I thought id experiment.
This idea uses a oscillating small 9g servo to push a bit of silicone tube up against the motor side. Its not working great but its just the first go. The small bits of black tube are in angled slots and they are supposed to push the arm towards motor on the in-stroke and away on the back stroke - more work needed here.
I was thinking it could be done with LUA or separate arduino detecting a white strip on motor. Ideas welcome.
On my tilting tri I can live with one non aligned prop but Im now thinking about the next project, a 4+1 and I don’t want to drag 4 misaligned props around so this issue need solving first.

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I have played about with a similar idea, but I was looking at doing it in software with a VESC controller, basically it can track the motors position at all times, so you can run it in current mode for flying then switch to angle mode and set it to stop where you want.

Unfortunately the vesc mini escs aren’t cheap

https://vi.aliexpress.com/item/1005005528310875.html

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Would something like this work for what you’re trying to do? A little bit cheaper, it looks like.

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There are cheaper controllers but they are are heaver. they would be better suited to larger motors.

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https://vi.aliexpress.com/item/4000437383339.html

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