@huaji wrote:
I made this aircraft based on the toy helicopter WLtoys V922.I use F4V3 as the main control board with some circuit modification to work with 1S battery.I changed main motor to 1020 coreless motor and propeller to DJI mavic propeller(d=22cm)，lead to 11 mins flight time.
Below，there is the hardware and price list.
15＄ Fuselage and server: original parts of WLtoys v922
3＄ Battery: 3.8V 1s 450mah 85C
6＄ Main control: omnibusf4v3
2＄ Blade: DJI 8331f
0＄ Tail motor: 716 coreless motor
3＄ Electric adjustment: two-way brush esc
5＄ Laser ranging module: vl53l1x
9＄ Optical flow module: cx-of v3.0
2＄ External Compass: hmc5883NEXT,I would like to share some pictures and videos with you
The helicopter tail have been changed to 45mm propeller for high efficiency.
The weight of the battery（AHTECH INFINITY 1S 450mAh 85C) is 12.4g.
Next, I will introduce the RPM sensor.
I made a RPM sensor with the photoelectric pair and LM393 comparator.It weighs only 0.7g.
This picture shows it’s going to last about 11 minutes.
I would like to share the FLOWHOLD MODE video with you through this link.
https://www.bilibili.com/video/av97371855#reply2563009850
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