HJ-Y3 Tricopter battery holder

The HJ-Y3 tricopter frame is quite nice. The two aspects I do not like is the placement of the landing gear and that there is no flat surface to attach a somewhat larger battery.
The landing gear is positioned to far to the front, which makes the tricopter tail heavy on landings. I moved the landing gear backwards 30 mm, which fixed the problem. This also made it possible to install a battery mounting plate that both provides a flat surface for the battery and room for two battery straps.

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