GEPRC Mark 4 - 7.5 Inch DeatCat-Geometry arms and stringer

thingiverse

These are custom parts for the GEPRC Mark 4 fpv frame. The arms and stringers should be cut-out from carbon fibber. recommended arm thickness: 6mm recommended stringer thickness: 4mm The reason why I designed these parts is that I had a lot of vibrations with the original arms and 2806.5 motors. I assume that these motors are too powerful for the 5mm original 7 inch arms. That's why I increased the thickness by 1mm and switched to a death-cat geometry in order to fit also 7.5-inch props. If you want even more rigidity, choose the linked front and rear arms. Second Image: Measurements of the new DC-geometry with 7- and 7.5-Inch prop circles. Third image: Comperation of the original and the new geometry. Original 7-inch prop circles. New with 7.5-inch prop circles. Deep vibration analysis of the GEPRC Mark 4 frame: https://www.youtube.com/watch?v=oc2BNNXInew&t=789s&ab_channel=ChrisRosser https://www.youtube.com/watch?v=jKT4hk0L2Tc&t=24s&ab_channel=ChrisRosser Recommended props: HQ Durable Prop 7.5×3.7×3 https://www.hqprop.com/https-hqprop-75x37x3-light-grey-2cw2ccw-poly-carbonate-p0353.html