The TT7 Summary

This is the last blog post that summarizes all high altitude balloon flights I did. It also provides a quick index to all the topics this blog addressed. Since seeing images from a high altitude balloon for the first time in spring 2013, I've launched three latex balloons with cameras and eleven superpressure balloons. With each successive launch, I tried to do something I hadn't done before. This blog documents the progress.

Up-Down Flights

callsign	date	altitude	balloon	info
TT7	16.9.2014	34396m	Hwoyee 800	recovered several hours later
TT7-40	22.7.2015	?	Hwoyee 1600	failed transmitter, recovered 2 months later
TT7F	26.8.2016	42337m	Hwoyee 1600	lost, disappeared during descent

Superpressure Flights

callsign	date	altitude	balloon	distance	days	info
TT7F1	25.8.2017	11242m	Sphere 1.33	9465km	8.6	last seen over Japan
TT7F2	29.8.2017	10524m	Sphere 1.33	3326km	2.1	last seen over Russia
TT7F3	31.8.2017	13403m	Sphere 1.84	275km	0.5	last seen over Hungary
TT7F4	8.9.2017	11864m	Sphere 1.84	210km	0.2	burst and landed at Polish-Slovak border
TT7F5	29.9.2017	12226m	Tube 3.33	1189km	1.4	last seen over Ionian Sea
TT7F6W	15.10.2017	12153m	Tube 2.33	3898km	2.9	last seen over Iran
TT7B1	13.9.2019	454m	Circle 1.35	360m	0.0	descended into treetops
TT7B2	15.9.2019	13500m	Obround 2.35	790km	0.9	descended in northern Croatia
TT7B1	21.9.2019	10800m	Circle 1.35	526km	0.5	relaunch, descended in Romania
TT7B2	1.10.2019	13400m	Obround 2.35	57355km	27.8	relaunch, 1 circumnavigation
TT7B3	13.10.2019	9898m	Circle 2.04	123km	0.1	last received ascending over Poland

TT7B

• The TT7B Tracker
• The TT7B Tracker Vol. 2
• The TT7B Summary

TT7F

• The TT7F Hardware
• The TT7F Software
• The TT7F Payload
• The TT7F v1.5 Revision
• The Low Power Setup

TT7-40

• The TT7-40 Hardware
• The TT7-40 Launch

TT7

• The Beginning
• The Box
• The Parachute
• The Camera
• The GPS (HTC HD2)
• The Thermometer
• The Payload Arrangement
• The Balloon
• The Intermission
• The New Tracking Solution
• The Transmitter
• The Batteries
• The Payload Assemblage
• The Planning
• The Launch

Individual Components

• The Solar Experiments
• APRS Automatic Position Reporting System
• SSDV Slow Scan Digital Video
• The Superpressure Balloons
• The Superpressure Balloons Vol. 2
• The Superpressure Balloons Vol. 3
• The μCurrent Custom
• The GPS Module Drift
• The LoRa SSDV
• The Reflow Oven
• The Vacuum Chamber
• The Pre-Stretching Rig
• The Custom Heat Sealer

Radio and Antennas

• The Radio
• The Antennas
• The New Antennas
• The Antenna Tuning
• The HF Setup
• The Low Noise Amplifier
• The APRS iGate

Studies

• The Air Traffic
• The Atmosphere

External Links

• Github
• Jupyter Notebooks
• Flickr
• Youtube

This is a combined map of all TT7 flights. The trajectory of TT7-40 is significantly affected by a transmitter failure. Because of that, it contains positional entries only from the beginning of ascent and then from where it was recovered. In case of the superpressure flights, the trajectories span to the last time the tracker's packet was received.

And that concludes TT7 high altitude ballooning.