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Hey Chris, Dave KI6YMZ here :) We did a SOTA peak many years ago in CO together!

You should check out HIRF-6 as well. Similar payload, and has been airborne since September of 2016!

https://www.qrp-labs.com/circumnavigators.html

Hey Dave! That was a fun trip. For those that are wondering what we're talking about, Dave and I once carried a bunch of amateur radio equipment up a Colorado peak in the middle of a brutally cold snowstorm. Video: https://youtu.be/g850RIQp6rA

Thanks for the HIRF-6 link. That's unbelievable! Hope you are doing well.

EDIT: woah. M0XER did 8 circumnavigations. That's unbelievable. I wonder if that is a record for a man-made, atmospheric object.

I always wondered... This thing is in Class A airspace? I'm sure an accident would be rare, but do airports issue NOTAMs for these?

Yes a NOTAM is required for launch

Not required, but FAA requests that you file one. NOTAM is required for payloads exceeding a weight limit.

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