EL-39 drum brakes.

cults3d

Drum brake for this EL-39 EDF jet: https://cults3d.com/en/3d-model/various/el-39-semi-scale-rc-jet-for-120-mm-edf It works great and I use this system in all my big jets now. Required hardware: Two M4x35 mm bolts:https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5575353675&campid=5338226872&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2FM3-M4-M5-M6-M8-12-9Grade-Alloy-steel-Allen-Hex-Socket-Cap-Head-Screw-Bolt-DIN912%2F282932421277 Four 47mmx3,5mm O-rings:https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5575353675&campid=5338226872&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2FMetric-Nitrile-Rubber-O-Rings-3-5mm-Pack-of-10-50-100-Cross-Section-12mm-60mm-OD%2F253621698783 Four 4x11x4 mm ball bearings:https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5575353675&campid=5338226872&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F10pcs-694ZZ-4x11x4mm-Open-Miniature-Bearings-ball-Mini-Hand-Bearing-Spinner-A%2F222477957546 5,6g MG servos: HV version: https://www.banggood.com/JX-Servo-DHV56MG-5_6g-DS-Digital-Coreless-MG-Metal-Gear-HV-Servo-1_2kg-0_10sec-p-1028942.html LV version: https://www.banggood.com/JX-Servo-DHV56MG-5_6g-Coreless-LV-Low-Voltage-DSMG-Metal-Gear-Servo-0_89kg-0_10sec-p-1034036.html