Posted by vincentmoe on September 5, 2009 at 1:49am
Please help me how to make recover parachute for UAV. My UAV is total weight 30 lbs and Pusher type like Pioneer ,USA.Please me Suggestion (1) which kind of parachutes (2)how to apply electronics relay or how to open this box.(3)how to make ourself for all.Thanks you so much!hawk
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This is the only decent reference I've ever found on the subject. (You used to have to buy it from Para Press, but DTIC has finally scanned a copy.) This book covers all the critical issues, and most of the calculations to design a parachute recovery system. (Admittedly, most of the examples are a bit heavier than our UAVs...)
WOW! 30lbs! that's one big UAV! do you have any pics?
As for your questions, I've been trying to make a parachute safety system for my (MUCH MUCH smaller) super cub lp. The major issue will probably be the pusher prop. You need some sort of system to prevent the chute from just opening into the prop.
For the kind of parachute... I'm not a chute expert, but I would suggest an amateur rocket parachute. Here is a website that sells rocket chutes and has information on them. In order to deploy the chute, you will probably want a spring to propel it up and away from the pusher prop. The trick will probably be fitting the whole thing in the fuse, because you will want to be able to close a hatch over it.
You can then secure the hatch with a servo.Your servo should control a pushrod that goes through a small hole on the fuze and another on the hatch. When the servo pulls the pushrod back so it no longer is holding the hatch closed, the spring will propel the parachute out of the hatch which will hopefully open above the pusher prop.
I don't know what your plane looks like, so this system might not work for you. If you pusher prop is consistently a problem with the parachute, you will probably have to get very creative... you could MAYBE use a custom foam prop and use the servo to open the hatch and break the prop (just an idea!)
Replies
As for your questions, I've been trying to make a parachute safety system for my (MUCH MUCH smaller) super cub lp. The major issue will probably be the pusher prop. You need some sort of system to prevent the chute from just opening into the prop.
For the kind of parachute... I'm not a chute expert, but I would suggest an amateur rocket parachute. Here is a website that sells rocket chutes and has information on them. In order to deploy the chute, you will probably want a spring to propel it up and away from the pusher prop. The trick will probably be fitting the whole thing in the fuse, because you will want to be able to close a hatch over it.
You can then secure the hatch with a servo.Your servo should control a pushrod that goes through a small hole on the fuze and another on the hatch. When the servo pulls the pushrod back so it no longer is holding the hatch closed, the spring will propel the parachute out of the hatch which will hopefully open above the pusher prop.
I don't know what your plane looks like, so this system might not work for you. If you pusher prop is consistently a problem with the parachute, you will probably have to get very creative... you could MAYBE use a custom foam prop and use the servo to open the hatch and break the prop (just an idea!)
Hope this helped!