Release mechanism

Im not sure if this is in the right section as its to with mechanical things but is used in aerial photography and atmospheric circles.

You have your platform attached to its balloon and you release them into the heavens but you have no predetermined release mechanism so it thing will go up and up and up and then more than likely plummit, tumble, breakup and splat. Poor platform it was only young.

Ive gone through some high altitude balloon setups only to find the release mechanism is non existant or unexplained. Here people are recommending servo driven systems but no one gives any details, pictures or diagrams. Rocketry us explosive bolts or CO2 which is a little OTT (apart from being really cool). I have found a blokes website that give some arduino based triggers using nichrome wire and some watch batteries which seems to be a pretty pimping idea given mass restrictions but I cannot be the only one thinking about this sort of thing.

 

What is your release mechanism?

 

If you do not have one, what would yours be if you did?

 

I'm looking for any idea really. A repository of ideas for this so myslef and others can expand upon this for future schemes

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Developer
    A lot of people just put a piano wire through a pair of loops connected to a servo.
  • We're (czanso.com, I promise to put up a decent homepage before the launch :D) using a resistive wire (Manganine alloy, probably like Nichrome) as a hotwire cutter to slice through the nylon load line and release the payload. Its advantages are simplicity (it's really just a wire), weight (zilch), and reliability over a wide temperature range. Its major disadvantage is that it needs some juice to operate - for example our czANSO Cutdown Device needs 750 mA at 9 V for a successful cutdown. Not that much, but it might pose a problem especially when the cutdown might be needed - at the end of flight, when batteries are running dry.

    A pyro cutter mitigates this issue by storing the heat energy in a small chemical charge instead of the battery - then only a very small impulse is needed to initiate it - 1 A at 9 V for about 5 ms, which can be easily provided by a capacitor. It's fatal flaw is that the compound we used (the only one I know how to cook :) is not exactly willing to burn at -60 °C, so instead of dealing with plasticized thermites we went all electric.

    We have a bunch of pictures and videos from our cutdown device research session over here (in czech though, if you feel up for some google translatese, then here). The last picture shows a "CAD" drawing of the cutter, if you're interested.
    Home - czANSO! We are going to near-space...
    czanso
  • Hobbyking sells a servo driven system with everything you need.
This reply was deleted.

Activity

DIY Robocars via Twitter
Apr 27
DIY Robocars via Twitter
Apr 27
DIY Robocars via Twitter
RT @f1tenth: Sliding (autonomously) into the weekend like ... 🤖😎 #f1tenth #robots #AutonomousVehicles @OpenRoboticsOrg @NVIDIAEmbedded @Aut…
Apr 25
DIY Robocars via Twitter
RT @chr1sa: One of the problems with autonomous car racing is that watching software drive is not a very exciting spectator sport. To help…
Apr 25
DIY Robocars via Twitter
RT @SmallpixelCar: Replaced AGX Xavier with @NVIDIAEmbedded Jetson Xavier NX. Now both cars look fast and clean https://t.co/jlcoY2EjZf
Apr 25
DIY Robocars via Twitter
RT @chr1sa: Yesterday we had a record number of competitors (36) in our monthly @DIYRobocars virtual autonomous car race. We kept it going…
Apr 25
DIY Robocars via Twitter
Apr 16
DIY Drones via Twitter
RT @chr1sa: After more than a year of only virtual races, @DIYRobocars returns to the newly renovated @circuitlaunch on May 22 for the resu…
Apr 11
DIY Robocars via Twitter
RT @DAVGtech: And now available with LiDAR 🔥 https://twitter.com/Heavy02011/status/1381137016381964293
Apr 11
DIY Robocars via Twitter
RT @Heavy02011: #VirtualRaceLeague: @DIYRobocars Race #9 - #ParkingLotNerds #thunderhillracetrack, CA Join us for the next race April 24th,…
Apr 11
DIY Robocars via Twitter
RT @DWalmroth: Weather's finally cooperating, looking forward to racing 1:10 scale autonomous cars outdoors again! @diyrobocars, @NVIDIAEm…
Apr 7
DIY Robocars via Twitter
RT @AIDRI_: I finally succeeded in optimizing the trajectory and speed of a car on a #racetrack. Next step: implement a 2d controller and…
Apr 7
DIY Robocars via Twitter
@jetdillo @circuitlaunch Actually the second *in person* event in a year. We do virtual races every month
Apr 2
DIY Robocars via Twitter
Update: we're moving it back one day to Sunday (the 4th) at 11:00am instead
Apr 2
DIY Robocars via Twitter
@GrantEMoe @circuitlaunch Update: we're doing it on Sunday (4th) at 11:00am instead
Apr 2
DIY Robocars via Twitter
RT @chr1sa: Maybe we should have a mini @DIYRobocars race in our lower school's playground https://t.co/xLFeua1R6X
Mar 29
More…