Redstone Rocketry Servo Chute Ejection System

thingiverse

Servo Chute Ejection System for BT-70 (55mm) rocket airframes.Mount the servo underneath the mount plate screwed in from the back.Piston head is attached to the piston via a single M2.5 screw.Once the piston is inserted into the mount, align the holes on the piston with the channels and insert an M2.5 screw in each hole. Add rubber bands between those screws and the hooks at the top of the piston.Depending on the size of rubber band, it may be necessary to double or quadruple loop the rubber bands for adequate force. Test multiple times before flight to ensure your setup can eject the parachute.In your flight software set your servo lock angle to be a 160 degrees. This is slightly more than the maximum lock angle so that some active pressure is applied during flight. To release simply command the servo to go to 90 degrees. You will likely need to calibrate your servo, 90 degrees should have the servo horn pointed along the long axis of the servo body.Arming the parachute ejection system can simply done by adding a delay at the start of your flight software, giving you time to press the piston down. After the delay, command the servo into the lock position, where it should hold until commanded to release.Recommended ServosSG90MG90S