3 inch is enough. Skyzone S140.

3 inch racing drone with mobius mini camera. Probably need to change the camera tilt angle... Equipment: Skyzone S140 FPV Racing Drone https://www.banggood.com/Skyzone-S140-140mm-RC-FPV-Racing-Drone-PNP-W-F3-OSD-4in1-20A-Dshot-5_8G-48CH-VTX-Foxeer-Micro-Cam-p-1238487.html?zf=771287 Taranis Q X7 Transmitter https://www.banggood.com/FrSky-ACCST-Taranis-Q-X7-Transmitter-2_4G-16CH-White-Black-International-Version-p-1196246.html?p=SB1510771287201409VO Mobius Mini camera Lens B 135 https://www.banggood.com/Mobius-Mini-Lens-B-135-Degree-Wide-Angle-Super-Light-FPV-1080P-HD-Camera-DashCam-60FPS-H_264-AVC-p-1121842.html?p=SB1510771287201409VO Aomway Commander Goggles V1 FPV https://www.banggood.com/Aomway-Commander-Goggles-V1-2D-3D-40CH-5_8G-FPV-Video-Headset-Support-HDMI-DVR-Headtracker-p-1107684.html?p=SB1510771287201409VO Realacc Triple Feed Patch-1 5.8GHz 9.4dBi FPV Pagoda Antenna https://www.banggood.com/Realacc-Triple-Feed-Patch-1-5_8GHz-9_4dBi-Directional-Circular-Polarized-FPV-Pagoda-Antenna-p-1195261.html?p=SB1510771287201409VO Music: Analog By Nature - Depart (cdk mix) http://dig.ccmixter.org/files/cdk/50347 YT: https://www.youtube.com/watch?v=TH6NmzE5rwA