Discussions

DroneChute

Posted by Ersin Acar on November 4, 2010 at 1:03pm

I bought drone parachute (it actually a supply parachute ) for my MQ9. I need advices about releasing it. I have 2 ideas about that issue;

for releasing;

i will cover the parachute with fiberglass box and servo for opening it.

for a good parachute opening;

- another little parachute at the top of main parachute.

- little explosived plywood under parachute.

If you have any idea or experience please share with me.

P.S. I'm going to my hometown today. When i come back to home, i will test parachute with a load and share the video here.

Ersin.

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Replies

Milind Pariwakam November 24, 2013 at 4:17am

Found this link to parachute systems being sold by microkopter.

http://mikrokopter.altigator.com/accessories-parachutes-rescue-syst...

A little expensive though

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Chris Woodry February 16, 2011 at 1:26pm

yep thats exactly what im talking about. the hole doesnt need to be that big. generally speaking the faster the object is falling the hole will need to be a little bit bigger... but start small and trim to your needs. rectangular will be just fine so long as its centered. otherwise you might end up with a slight thrust to it pushing you in one general direction (there are steerable chutes made like this.. but the holes are lower in the fabric and in a much more complex and measured out pattern.
Chris Woodry February 15, 2011 at 6:25pm

well since folks are doing a bit of r&d on a chute.. ever notice on a parabolic (round) parachute they typically have a hole up top? this is to allow a small bit of air to spill through. otherwise you have air trying to spill out of the sides and you get an oscillation. we referred to this in jump school as death wobble... i think the name is self explanatory. with some of my larger rockets int eh past (less than 5lbs) they would still get the death wobble. id imagine a plane will too. the death wobbles CAN get bad enough to fold a chute over on itself and thats it. big wad of nylon chasing your plane to the ground.
Ersin Acar February 14, 2011 at 11:22pm

I didn't work on my drone cuz of works for a while but i started again to assemble. Btw i tried it with a water melon (3 kg / 6.6lbs) its was perfect but melon cracked anyway cuz of a sharp stone ^^ I recorded it but cant find my SD card when i find it i will put here. or i can make another test :) for relasing system i will use servo opening gate and CO2
Chris Woodry February 6, 2011 at 8:20pm

i have a few rocket flare parachutes (less than 24" diameter) that are extremely lightweight and durable that i used in model rocketry a long time ago. i think they might help with the weight thing. dont have and pics on hand. but something along these lines would help keep your weight down... or maybe make one out of mylar and a waxed linen cord.
Developer

Jani Hirvinen February 5, 2011 at 9:44pm

Ersin, most applications what I have seen have servo holding parachute on top of quad. CO2 and other are good but as always KISS is the best method and it works. Sure there can be all type of cypress launchers that i used to use while doing skydiving.

Some really simple tube mount would be best but then the weight will be issue too.. Let's see what future brings for us.
Chris Woodry February 5, 2011 at 8:38pm

one additional thought. when working with BRS systems on some of the civil aircraft that i fly now, its a good idea to not that a lot of pilot chutes may become tangled in the aircraft if youre in a flat spin or a roll and you cant get it clear of the aircraft quick enough. use a good strong spring when you do your models brs. id try it out maybe on a tumbling brick or something that has a very violent and quick spin to over-simulate the worst possible scenario you would see with something like a complete wing failure.
Chris Woodry January 1, 2011 at 12:15pm

just a thought. i used to jump freefall for the army, and im tinkering with a few BRS (ballistic recorvery system) knock offs for a later generation of a uav. my pilot chute on my FF rig was spring loaded. why not created a small canister, pack it like a parachute, use a servo to "pull the pin" and the spring loaded pilot chute would either deploy the main chute or a spring loaded platform underneath the main chute would jsut shove ti ouw. itd be packed under pressure. no need for explosives or co2.
Ersin Acar November 6, 2010 at 12:02am

I found a company that making parachute for drone systems. and a test page at their website
http://www.butlerparachutes.com/pia99.htm

there are photo sequences like here. i will make a research on this photos. there is one chance for air test. if i fail, my all works and money gone :). Maybe i can make a launcher mechanism like UAV launcher. so i can test it with fake loads :) (or just find a high building and throw it xD )
Ravi Gaddipati November 5, 2010 at 1:45pm

I think a container with a cap would be best. The cap can come off with a small charge (perhaps something like the putty charges).

This is lighter, almost foolproof, not mechanically intensive, and is easy to implement redundancy.