Here i'm going to be showing you guys the making of my quad-copter parachute recovery system. I try and explain it all in the video so give that a watch.
You should be able to tailor this to suit your multirotor. The main features you really need is enough room between the props to fit a suitable sized container for the size of parachute and a flat surface in the center of your multirotor.
Equipment you will need:
1 Cheap Tupperware container
1 9-gram servo
1 rubber band
1 piece of depron (large enough to cover the top of the Tupperware.)
1 parachute of suitable size. (60" is best for 450 sized quads.)
Glue (hot glue works best.)
For the parachute I roughly followed ExperimentalAirlines tutorial for making parachutes for cargo drops. I created a parachute with a diameter of 60". However instead of using a mesh fabric like he uses, I used 8 pieces of strong chord and glued them equally spaced around the edge. This is a simple parachute to make and yet it works reliably and effectively.
For the container I used a Chinese takeaway container. I glued this onto a flat surface on the top of my quadcopter and punched 2 holes through the container. I then threaded a bit of string through each hole, slid them through the quadcopter frame and tied them together. where the two loose ends come together inside the Tupperware container i tied them together creating a secure place to attach the parachute chords too. This will ensure that when the parachute opens it will be pulling on the whole quadcopter frame and not just the Tupperware container. On one side of the container I used Duct tape to create a hinge for the depron sheet so that it acts as a lid on the Tupperware container. This will be what holds the parachute inside the container.
The release is simply a 9 gram servo glued to the side of the Tupperware container. This glue must be strong as it will have to hold the weight of the rubber band pulling on it. The rubber band is then tied onto the opposite side of the quadcopter than the servo is attached. Once this is done you can attach the parachute to the chords in the Tupperware container, fold the parachute into thirds, Lay the parachute lines down neatly inside the container, place the parachute inside the container, Fold the lid down and then stretch the rubber band over the lid and hook it over the arm of the servo. This will hold down the lid and when released should allow the lid to be sprung open by the folded parachute and therefore ejecting the parachute and lines above the props meaning they can't get tangled in the line.
Here it is in action on my VC-450 quad frame.