Hi.I consider to make a magnetic recovery system for nose cone.I use two neodymium magnet .Is it okey
We do need more information, but is this what you are talking about?Hi.I consider to make a magnetic recovery system for nose cone.I use two neodymium magnet .Is it okey
Can you explain more detail?Just make sure you have a mechanical switch disconnect.
Sorry, it was a joke referring to another very active thread on this forum.Can you explain more detail?
I think you need to give us more detail of what you are wanting to do.Can you explain more detail?
We do need more information, but is this what you are talking about?
https://rebelrockets.wordpress.com/chutes/magnetic-deployment-device/
two ring magnet,one is in nose cone,other one is in body.They attract each other so nose cone doesn't fall.when the rocket is in apogee,reverse polarization was made that magnet is in tube.Then nose cone fall.You think is it okey?and Can you share documents about that?I think you need to give us more detail of what you are wanting to do.
Probably looking for a non-pyro deployment method.sounds interesting, but one question: why? Seems like a very complex solution for ejection when all you need is some bp
two ring magnet,one is in nose cone,other one is in body.They attract each other so nose cone doesn't fall.when the rocket is in apogee,reverse polarization was made that magnet is in tube.Then nose cone fall.You think is it okey?and Can you share documents about that?
what is the aim of servo?why is it there? Can you explain more detailed.I think that swich on current to magnetThis will be hard to write about without specialized vocabulary.
There are reasons that it would be better to do it the other way.
View attachment 406080
Use an altimeter or an accelerometer to control the servo motor.
Use the magnets like a compressed spring to push the nose cone off.
The parachute will need to be packed so that it will fall out of the rocket. You must build it so that the parachute will not need to be pushed or pulled to get it into the air.
There is not much information about how to do this kind of deployment, because almost nobody does anything like this.
Most of the people who post on this forum will use a pyrotechnic to separate the parts of the rocket and push out the parachute. It is simpler and there are systems that you can buy.
If you want to pursue this search on line for "non-pyrotechnic deployment" or "non-pyro deployment".
The people who fly water rockets have worked out a couple of different solutions for this. You could start here.
https://www.uswaterrockets.com/construction_&_tutorials/ServoChron_2/tutorial.htm
https://www.instructables.com/id/Water_Rocket_Parachute_Deployment_Mechanism/
what is the aim of servo?why is it there? Can you explain more detailed.
I think that swich on current to magnet
I think that when rocket is apogee,system switch on current to magnet.Thus nose cone fallThe servo opens a latch to release the nosecone.
Yes. I think I understood what you want to do. You want to use an electromagnet to hold the nosecone on while it is going up, and to push the nosecone off to release the parachute.
View attachment 406097
It will be hard to explain all of the reasons that this will be difficult. I worry about using phrases like "magnetic flux density" and "power dissipation" Not all of the native english speakers on the forum would be able to follow this discussion.
I will try to explain:
If the electromagnet holds the nosecone on, you will have to push current through the coil all of the time (from launch pad to apogee) to keep the rocket closed. This means a high current power-supply. This means a big battery. This will be heavy. If you use lithium batteries it will also be more dangerous. Lithium batteries burn and release poison gas when they rupture, It is a bad idea to put big lithium batteries into a rocket that might crash out of the air, or burn on the launch pad.
Your system also means that the nosecone can come off if the current through the coil stops for any reason. If a wire comes loose while the rocket is accelerating upwards, it will separate the nosecone.
Even if you only want to push the nosecone off, you will still need to a large current through the coil to move the mass of the nosecone fast enough, far enough, to be sure that the parachute gets out.
A mechanical latch that has to be OPENED only requires current while the servo is running. It will require less current, for less time, and will not open the rocket if the current fails.
I think that when rocket is apogee,system switch on current to magnet.Thus nose cone fall
1)Magnets attract each other because one is N other is S.When switch on current to magnet,both of them is N or S so nose cone will fall.Is it okey.Is that sturdy?1) What holds the nose cone on until apogee?
2) Do you know what the words "inductive reactance" mean?
1)Magnets attract each other because one is N other is S.When switch on current to magnet,both of them is N or S so nose cone will fall.Is it okey.Is that sturdy?
2)I dont know what is that mean
Some of us have been discussing a chute release for DD and magnets ran across my attic once or twice but how to make them let go is the issue.... I use them in all kinds of projects but in those cases I an standing there to make them release...
Honestly, I think the the best application is to use the repulsion of magnets as a source of potential energy to do the work of opening a shroud, or to use the attraction to do the work of pulling a pin to release a mechanical connection.
Using magnets to hold the rocket together is tricky. The force of attraction (or repulsion) is strong along one axis, but falls off pretty rapidly as you rotate away from that axis. Think about how you "peel" magnets apart. A magnetically secured structure will not be very rigid against shear stress.
But used as a magnetic "spring", neodymium magnets provide a higher energy density than would an elastic solid (like a spring or a rubber band).
I agree on all counts and thanks for the ideas. I would very much like to help come up with a non-pyro DD system.
At the end of the day, you’ve got to rapidly deliver X joules of energy to separate the rocket and shove the recovery system out. Energy is energy, and being electrical doesn’t make it any less dangerous.
Every electronic / engineering instructor I ever had took glee in exploding electronics behind blast shields — partly to show that “electrical” is by no means safe. (But mostly because everyone loves explosions...)
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