This video shows you how recovery works, various arrangements from motor ejection through electronic dual deployment, and my favorite products and techniques. See jcrocket.com/el... for more info.
Пікірлер: 45
@simontanguay36195 жыл бұрын
Thanks a lot for your videos. I have been exploring your channel for a while and you have great content to help beginners in high-power rocketry. Even more seasoned rocketeers may find valuable pieces of advice from you.
@TheNikhilmishras5 жыл бұрын
so what r you building...?
@chris33836 жыл бұрын
I've lost a couple cheap rockets as a kid ...now as an adult wanting to go mid/high power the rockets are no longer cheap so every rocket I've built has dual-deployment ...very informative video and your method is how I was taught ...not to mention with dual-deployment unless the wind is really high speed you generally don't have to walk as far for recovery
@copperstaterocketguy16403 жыл бұрын
Hey John, thanks for the video. Your content always helps when I'm building and stuck. My biggest problem is finding a safe place to launch in Arizona! Clear skies and happy Landing brother
@paulromsky95272 жыл бұрын
Great video! For my Ejection Charges, I am going to take a 1 inch by 1/2 inch diameter copper pipe, sweat on an end cap, and screw it to the bulkhead via a small hole and screw in the end cap. I will have thumb screw connectors on the bulkhead that the electric match attaches, I stick the match inside the copper pipe (pot), tamp in the black powder, a little wadding, and a few drops of hot wax to seal it. I am going to have two switches, one for Main Power, and another for Launch/Eject Safety. I prep the rocket on the stand. Place my electromagnetic Launch Transducer on the proper spot of the hull on the Avionics Pod (no mechanical connection), the Launch Panel is over 100 feet away, I have the key so it is safe. I use wire not radio to launch - less chance of jaming/false triggering. I turn on the Main Power on the rocket, the Trinket M0 does its self test and if all is OK and it confirms no current to the Launch/Eject transistors, a greed LED comes on (safe to apply power via the Launch/Eject Safety switch). If the green LED is not on, something is wrong and you simply turn off the main power and leave the safety switch in the safe position. I walk back to the Launch Panel, put in the key and turn it to Power On, I can see the green LED on the rocket. If still green, I press the launch button, this causes a strong magnetic field in the Launch Transducer. The circuitry inside senses the field and begins its "mission" sequence to launch and control ejection at apogee.
@JohnLCoker2 жыл бұрын
Interesting idea for a launch controller. Good luck with your project!
@garyroberts4111 Жыл бұрын
Great knowledge. easy to follow
@MrSpikebender6 жыл бұрын
Great video!!! you answered a few things that come with going bigger that I was having issues with.
@tamasmaksza64506 жыл бұрын
John, the Rabbi is in several episodes....gotta check em out. And, yes it was a compliment. Your video was great, and informative as I ponder the next steps in my rocket recovery systems.
@paulpopp1999 Жыл бұрын
Very informative video. You've answered many questions. 👍🏼
@adonikam13 жыл бұрын
Excellent! Thank you again!
@paulromsky95272 жыл бұрын
I am going to use an Adafruit Trinket M0 microcontroller. It costs only $9 USD and is the size of a postage stamp. Adafruit makes a wide assortment of low cost sensors: Altimeter, 3 Axis Accelerometer, Temperature/Humidity, Cameras, and much more. Coding the Trinket M0 is easy, it uses Circuit Python built in. You simply write your code in a text file using any text editor (like Notepad), connect the Trinket M0 to your PC via a USB cable, the Trinket M0 shows up as a mini Thumb Drive and you simply drag and drop your file onto the Trinket M0 and you are good to go. It has a built in green power LED, a programmable Multi-Color LED, and a programmable on/off Red LED - all built in. It has 5 I/O pins that can be programmed as inputs or outputs, one can be used as an Analog input or output. You can daisy chain all of your sensors using just two pins programmed as an I2C bus. I am going to add model rocketry to the Summer STEM class I teach. Young minds love to program! Adafruit even makes the Feather M0 which has much more I/O and capabilities for only $22 USD and is only about double the size.
@JohnLCoker2 жыл бұрын
Yeah, there's an amazing variety of things available. I'm sure you'll have fun developing your own system.
@paulromsky95272 жыл бұрын
@@JohnLCokerThanks. I just finished the hardware design yesterday. Now I have to write the code. I had to switch to the Adafruit Feather M0 because I needed more I/O. Part of the power on self test is to measure battery voltage, then apply a small amount of current to each electric match as a continuity test to insure they are connected properly.
@greenlex51811 ай бұрын
That's a damn good video! Thank you!
@mrphysics2625 Жыл бұрын
14:50 just use adhesive in the battery mount like they do with smart phone batteries.
@orcasea595 жыл бұрын
John, just wondering why you choose to use the plastic vials instead of ubiquitous cups that you tend to see for deployment charges. It seems obvious that they are lighter, less expensive and simpler. Are there any other reasons? Any other advantages or disadvantages to your method? Also, regarding retaining the vials, have you considered a lightweight electrical clamp to hold them down, or would that affect the deployment charge in a negative way? I only ask because I know things like heat can affect the adhesive on tape and I'm a little leery of the affect of a vial-style deployment charge coming unstuck after sitting on a hot pad and swinging free.
@JohnLCoker5 жыл бұрын
The charge wells are fine; I just find it easier to use disposable containers. They're easier to prepare outside the rocket and there's no need to clean the wells. They charges are light, so I don't think there's any need to tie them down at all; I like to tape them in place just to keep things neat when prepping the rocket.
@Rudeabaga6 жыл бұрын
Very interesting, can you give more detail on how reverse ejection works, the arrangement of the parachute and such ? I never thought of that as possible method before.
@JohnLCoker6 жыл бұрын
"Reverse" just means which part of the airframe the coupler is fixed to (aft vs forward section). Expanding gasses press evenly on all surfaces of the container so it doesn't really make any difference which end the coupler slides out of. The parachutes are still arranged the same way.
@robertreynolds92285 жыл бұрын
Very cool thank you.
@melplishka59783 жыл бұрын
Great vid ty.
@davidshareefChTPhD3 жыл бұрын
I'm learning some new techniques on model rocketry from Jermaine from flight of the concords lol
@pestypig7 жыл бұрын
Excellent video
@tcbetka8 жыл бұрын
Helpful video... Thanks!!
@dusternal4 ай бұрын
hi Jon...try using an external microphone..💪😎💯
@NoName-qv4zm3 жыл бұрын
Hi John. I am looking for a cheap GPS tracker for my Level 2 rocket. I am planning to incorporate dual deployment, since I lost my rocket during previous L2 attempt. What would you recommend? Thanks.
@JohnLCoker3 жыл бұрын
I wrote an article on GPS trackers: jcrocket.com/gps-tracking.shtml Not sure any of them count as "cheap," though. If you can solder SMT parts, you can try this kit: eggtimerrocketry.com/home/eggfinder-gps-tracking-system/
@jamesreichardt75733 жыл бұрын
Instead of using black powder would a firecracker do as well ?
@JohnLCoker3 жыл бұрын
I believe firecrackers are made with a different formulation, more like flash paper, but you could give it a try I suppose.
@todd7182 жыл бұрын
Since Hogden, the last US producer of black powder (Goex) will not be producing Goex after this year (2021), how does Pyrodex work for the ejection charges? I would think that the electric match would set it off ok. Pryrodex requires a hotter ignition source than real black powder.
@MF-og1ct7 жыл бұрын
How reliable is electronic deployment and is the software generally pretty easy to work with? I'm in the process of building a Madcow Super DX3 for my level 1 certification, and I want to put dual recovery in it, so that I can use it for my level 2 cert as well. Also, what is your opinion of the Perfectflite Stratologger altimeter CF? What kind of transmitter can I add to it so that I can get the location of my rocket transmitted to me? What will receive that transmision? Thanks you for your help -Matthew
@JohnLCoker7 жыл бұрын
If you do everything properly, very reliable. IMO the source of unreliability is not the hardware itself, but setup and wiring. For example, improperly stripping insulation on solid core wires will nick them, which creates a weak spot that can break. Note that electronics are also more accurate than motor ejection, which becomes a significant source of failure for heavier rockets. Most software used to configure electronics is poor, so I suggest starting out with a unit that needs little or no configuration.
@JohnLCoker7 жыл бұрын
I have not tried them, but they seem to be popular and well-supported.
@JohnLCoker7 жыл бұрын
Lightweight cloth is used in R/C aircraft, so a local hobby shop would have it (if there is one near you). Otherwise online; search for Hobbico 3/4oz cloth (www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXL491&P=ML).
@Mairalife03 жыл бұрын
Nice.vedeo
@amirhoseinmoosavi49284 жыл бұрын
I like & love you.
@dalemedin6424 жыл бұрын
Could you provide a link to your source for the plastic vials?
@JohnLCoker4 жыл бұрын
I think I bought them long ago from Edmund Scientific, but now I would buy them from Amazon.com.
@tamasmaksza64506 жыл бұрын
He's the Rabbi from Seinfeld....
@JohnLCoker6 жыл бұрын
Haven't seen that episode, but I'll take it as a compliment.
@vikasberad5 жыл бұрын
sir , i need your help.. can i get your email so that I can get in contact with you..