20333
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I have seen manually triggered recovery events used effectively on some relatively high flights. A DTMF tone over a normal radio was used. It worked.
I prefer altimeter deployment personally.
You right but my rocket is build since many years and does not have any electronic systemThe sustainer should never be dependant on "motor deployment".
It is best to use altimeter based electronic deployment in the sustainer.
In addition to altimeter deployment... you could add "remote" deployment using a button in-your-hand for added safety.
The E-Match would have a "plug" soldered to it to fit the servo pins in the receiver.
Dave F.
You right Dave. I want just not crash my second stage IF the motor not start ( Sorry, i speak french ), this is not for start the second stage.The OP is asking about adding a backup ejection system to an already-built rocket. He wants it to be manually activated by radio control, in the event that his upper stage does not ignite, as a "fail-safe" to prevent the rocket from streamlining in. Obviously, his upper stage is using motor ejection and not electronics.
As I see it, the biggest problem would be ensuring that the transmitter has sufficient range to be reliable at a considerable distance. A "Spektrum" RC system should be able to handle that task.
I am no "RC guru", but the combination of these items might work (The E-Match would have a "plug" soldered to it to fit the servo pins in the receiver.
https://www.horizonhobby.com/produc...smitters/ttx410-4-channel-slt-system-tacj2410
https://www.horizonhobby.com/produc...ivers/ar410-4-channel-sport-receiver-spmar410
https://www.horizonhobby.com/radios...0mah-2s-66v-life-receiver-battery-spmb300lfrx
https://electricmatch.com/rocketry/see/6/6/mjg-firewire-initiator
Dave F.
That absolutely will not work.
If you choose to go the remote route, you would need an electronic switch or relay module going to the receiver to fire the initiator.
Good, it seem that it's the best solution, Altimeter with ejection charges beneath the piston20333,
If you’re thinking of adding a receiver and ejection charge beneath the piston, just do exactly the same thing except use an altimeter instead. The work will be almost exactly the same. I would build it into a coupler and split the airframe.
I would not build either into the piston. Pistons take a beating.
Good, it seem that it's the best solution, Altimeter with ejection charges beneath the piston
Thank's
Yep the retroKit 3000. I check also that : - )PML has instructions for adding their CPR 3k to their kits. After watching a rocket lawn dart due to what I considered a bonus delay, I converted all of my motor deployment rockets to dual deployment using the general method shown in their instructions. It worked well.
Good luck!
The OP is asking about adding a backup ejection system to an already-built rocket. He wants it to be manually activated by radio control, in the event that his upper stage does not ignite, as a "fail-safe" to prevent the rocket from streamlining in. Obviously, his upper stage is using motor ejection and not electronics.
As I see it, the biggest problem would be ensuring that the transmitter has sufficient range to be reliable at a considerable distance. A "Spektrum" RC system should be able to handle that task.
I am no "RC guru", but the combination of these items might work (The E-Match would have a "plug" soldered to it to fit the servo pins in the receiver.
https://www.horizonhobby.com/produc...smitters/ttx410-4-channel-slt-system-tacj2410
https://www.horizonhobby.com/produc...ivers/ar410-4-channel-sport-receiver-spmar410
https://www.horizonhobby.com/radios...0mah-2s-66v-life-receiver-battery-spmb300lfrx
https://electricmatch.com/rocketry/see/6/6/mjg-firewire-initiator
Dave F.
Yes, once upon a time when rocket electronics weren’t as commonplace as they are now people repurposed Radio Shack personal paging Systems to do that. After reading about that in HIgh Power Rocketry Magazine I stumbled across such a system marked down for clearance at a Radio Shaack and bought it. I never did use it.
I also remember seeing a friend futilely mashing the button on a non-responsive WRC while his rocket plummeted to earth.
I agree about preferring altimeters.
Mark, the system you are probably thinking of is the Radio Flyer system designed and sold by Tom Farrand. I bought one back then and used it extensively in my two stage rockets. Compared to modern electronics, is was bulky and heavy but it worked,Back in the 90's a remote firing system was sold for rockets. I can't recall the name right now.
A local flyer used it for lighting second stages.
M
Steve, Do you know if a post mortem was done on that particular flight and whether or not there was an installation issue. Stuff like broken antenna or battery wires due to G forces can be an issue.
Personally, I think a remote system should be for non-critical events ie. turning on a camera, something so if it failed, wouldn’t affect the safe recovery. Or... As an absolute last ditch attempt to save a rocket as a secondary or tertiary backup. Even then the system needs to be digitally encoded to avoid accidental actuation. I have a 72mhz R/C switch I bought over 10 years ago that I never used and would never use on a recovery circuit.
Why do you say? Well on a high flying rocket, if someone turned on a 72mhz R/C transmitter within 20 miles, could have a nasty event occur. At least it would occur in flight as soon as the receiver got a line of sight signal from the spurious transmitter. Granted, 72mhz R/C usage is not as common as it used to be but I wouldn’t want to risk it with a non-encoded event signal.
The other really big negative with R/C deployment is dependence on having a visual on the rocket. If it is going to extreme altitude, even if one is GPS tracking on a live map, one has to recognize they’re in a major failure situation and either try to get a visual on the rapidly descending rocket or blindly pushing the main chute deployment button and risk blowing the main many thousands of feet up. Mess up the timing and the main chute is going to shred if the button is pushed late. Again the big problem is getting a visual. I’ve had GPS high fliers end up recovering upwind from me due to winds aloft when the crowd is looking 180 degrees from where the rocket is actually coming down as they are assuming the ground level winds. Can’t see the rocket in distress and one might hear the “WHUMP” before it even occurs to them to push the button!
Live map tracking is great but it takes practice to get used to it. Everything said above about frequencies is valid.
Bottom line is it’s best to use onboard deployment circuits and considering R/C as a tertiary backup is dubious due to the narrow window for it to be successful. At best it would be a false sense of security. Kurt
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