magnetic apogee detector + timer

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drew
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magnetic apogee detector + timer

Postby drew » Wed May 10, 2017 10:48 am

I routinely fly with Wooshtronics uMAD magnetic apogee detectors for lowish altitude flights. Sadly Wooshtronics is no longer in business so getting another uMAD isn't possible. That said I came across this product yesterday.

https://zeptobit.com/zeptomag-with-screw-terminals.html

Whilst not exactly cheap it does provide redundancy for apogee deployment as it does have a backup programmable pyro channel.

If I didn't have uMADs I'd consider picking one of these up.
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OverTheTop
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Re: magnetic apogee detector + timer

Postby OverTheTop » Wed May 10, 2017 11:23 am

If you are buying one to fly down here check that they are compatible with being in the Southern hemisphere. If not explicitly mentioned in the instructions you might just need to mount the board up the other way.
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Re: magnetic apogee detector + timer

Postby kopius » Wed May 10, 2017 12:31 pm

OverTheTop wrote:If you are buying one to fly down here check that they are compatible with being in the Southern hemisphere. If not explicitly mentioned in the instructions you might just need to mount the board up the other way.

Looks like they have gone a little further than the uMads:
Easy calibration function. Hold the board at the angle you wish to deploy and press the button. Allows adjusting for different magnetic fields worldwide and choosing the angle you wish to deply at.
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drew
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Re: magnetic apogee detector + timer

Postby drew » Wed May 10, 2017 2:40 pm

Yep, what Blake said. Also, here's a further expanded snippet from the manual which indicates they're fully user adjustable and testable without the need for a grain of wheat bulb, which is what I currently use to ensure my uMADs are still functioning nominally.

• On-board LED will turn on when the ZeptoMag is pointing below the horizon. Makes it
easy to verify correct operation.
• Easy calibration function. Hold the board at the angle you wish to deploy and press the
button. Allows adjusting for different magnetic fields worldwide and to deploy at the
angle you choose.
• Magnetic sensor resets several times per second to avoid errors from temporary exposure
to magnetic fields.
• Small size: 39.4 x 12.7mm. Fits inside a 13mm ID tube (BT-5).


Full manual can be found here.
http://www.zeptobit.com/download/ZeptoMag-User-Manual1.pdf
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 23,908ft - K300 - Balls 22
Max V - 2,488 ft/s, ~Mach 2.2 - M2250 - THUNDA 2015

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OverTheTop
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Re: magnetic apogee detector + timer

Postby OverTheTop » Wed May 10, 2017 2:49 pm

Looks like they have gone a little further than the uMads:

Looks like they have put some effort into the mathematics. Nice. Good to see devices evolve. :)
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Re: magnetic apogee detector + timer

Postby KyleCooper » Wed Sep 06, 2017 6:23 pm

I will definitely check the product you shared, just actually looking for a quality timer ( tend to something from https://www.icrfq.com/family/261 ). My electronics knowledge is rather poor, usually looking for recommendations at forums.


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