Date   
Re: KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Jerry
 

I did some measurements on balloons that were discussed on the list but never presented anything at gpsl.  I flew a flight with a differential pressure sensor on the balloon and measured the pressure curve.

I'm still on the road after GPSL but will dig up what I did when I get home next week.

Jerry Gable
Balloon Flight Prediction tools
http://www.s3research.com


On Tuesday, June 25, 2019, 5:13:04 AM MST, BASE_DePauw <hlbrooks@...> wrote:


I don't have a copy of the paper, but recall James Flaten of U Minnesota talking about internal and external pressure of a latex balloon back in 2011. Shortly before burst the internal pressure exceeds the external. James thought that it could be possible to use this difference to cut away from the balloon just before burst to avoid post burst chaos.

My students and I talked about floating large payloads at 20 km at GPSL2017 in Hutch.

Howard

On Tue, Jun 25, 2019, 12:27 AM Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Hi Gur,

  Empirically, I have planned quite a few latex floater flights using lightweight payloads and low free lift. My best success has been with payloads under 2.5 pounds and just a few ounces of positive lift. Less than 250 ft/min ascent rate can often achieve float with lightweight payloads. However, the best balloons to use for this are 1200 gram or larger. NG0X managed to float a payload on a 1000 gram balloon. However, this balloon (KD0VJI-11) was just a small 600 gram balloon. But the total flight train weight was just over 2 ounces with about 3 ounces of free lift and it worked great, which is quite an accomplishment for such a small balloon and an amazing peak altitude for a 600 gram balloon as well (101,430 feet).

  But apparently the amount of lifting gas was below the breaking force of the latex until the UV radiation eventually degraded the latex after a day or two.

  There was a paper presented at GPSL a few years ago describing this effect to predict the success conditions for floating a latex balloon measuring the internal pressure of the balloon during flight. Does anyone remember who gave that talk or have a copy of it?

- Bill WB8ELK




-----Original Message-----
From: BASE_DePauw <hlbrooks@...>
To: GPSL <GPSL@groups.io>
Sent: Mon, Jun 24, 2019 9:19 am
Subject: Re: [GPSL] KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Gur,

My students investigated this phenomena a few years ago, inspired by Ron K6RPT (https://www.popsci.com/technology/article/2011-12/amateur-radio-balloon-makes-record-transcontinental-transatlantic-flight/) and his transoceanic flights plus a near floater of our own that carried a load of 3 kg (BASE 67 in 2011).

The latex in the balloon stretches like a spring obeying Hooke's law.  The more that the balloon is stretched the more force that is needed to stretch it further.  Additionally, the spring constant for latex is not constant, but actually increases dramatically in the last few centimeters of stretch before the latex breaks (and the balloon bursts).

When small amounts of lifting gas, either hydrogen or helium, are in a large balloon, there are not enough gas molecules to exert the required force to stretch the balloon to the breaking point.

Howard, KC9QBN
BASE, DePauw

On Mon, Jun 24, 2019 at 12:04 AM Gur Lavie <gurlavie@...> wrote:
Hei Bill,

Whats the physics behind a Latex becoming a floater ? 

Does it mean it was completely “under” filled ?
Can this be intentionally planned and launched ?

Thanks

Gur

On Sun, 23 Jun 2019 at 22:10 Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Fascinating flight. I believe this is the smallest balloon (600 gram) to achieve a stratospheric float. They are flying a Skytracker board without the solar panels but with a 4 AAA lithium battery pack. It worked through the entire night at -50 deg C or below and is still doing great after 27 hours aloft. After the foamcore, tape and bubble wrap the payload came in at 65 grams (about 2.3 ounces). They put 140 grams (about 5 ounces) neck lift into the 600 gram latex balloon. The ascent rate was below 250 ft/min most of the flight and it floated around 101,000 feet. It is still flying over North Dakota and has made it through mid-day so far.

Callsign: KD0VJI-11

We also launched a Skytracker from the Athens AL Field Day site this morning and it is floating nicely heading over central TN at the moment (Callsign: N4SEV-11).

Also, PB0AHX-1 is flying over Germany at the moment with a Skytracker that I modified to output 50 baud RTTY after the second APRS transmission. You can hear it on 145.300 MHz via one of the many websdr.org receivers in Europe.  I could hear it well from a couple of websdr radios in western Germany this morning.

The RTTY telemetry is displayed on tracker.habhub.org under the callsign PB0AHX.

- Bill WB8ELK





-----Original Message-----
From: Jim Reed <jim.reed@...>
To: GPSL <GPSL@groups.io>
Sent: Sun, Jun 23, 2019 9:15 am
Subject: [GPSL] Floater - was not the plan

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.



--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
602 S. College Street
Greencastle, IN 46135
hlbrooks@...
Office: (765) 658-4653
FAX: (765) 658-4732

Re: KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

BASE_DePauw
 

Just for a quick check, I ran LiftWin from Hank N1LTV for a 600 gram Totex with hydrogen gas and 2 ounce payload and the predicted burst altitude is about 120,000 feet.  This supports the idea that the gas could not stretch the latex enough to reach the burst condition.

Howard, KC9QBN


On Tue, Jun 25, 2019 at 12:27 AM Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Hi Gur,

  Empirically, I have planned quite a few latex floater flights using lightweight payloads and low free lift. My best success has been with payloads under 2.5 pounds and just a few ounces of positive lift. Less than 250 ft/min ascent rate can often achieve float with lightweight payloads. However, the best balloons to use for this are 1200 gram or larger. NG0X managed to float a payload on a 1000 gram balloon. However, this balloon (KD0VJI-11) was just a small 600 gram balloon. But the total flight train weight was just over 2 ounces with about 3 ounces of free lift and it worked great, which is quite an accomplishment for such a small balloon and an amazing peak altitude for a 600 gram balloon as well (101,430 feet).

  But apparently the amount of lifting gas was below the breaking force of the latex until the UV radiation eventually degraded the latex after a day or two.

  There was a paper presented at GPSL a few years ago describing this effect to predict the success conditions for floating a latex balloon measuring the internal pressure of the balloon during flight. Does anyone remember who gave that talk or have a copy of it?

- Bill WB8ELK




-----Original Message-----
From: BASE_DePauw <hlbrooks@...>
To: GPSL <GPSL@groups.io>
Sent: Mon, Jun 24, 2019 9:19 am
Subject: Re: [GPSL] KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Gur,

My students investigated this phenomena a few years ago, inspired by Ron K6RPT (https://www.popsci.com/technology/article/2011-12/amateur-radio-balloon-makes-record-transcontinental-transatlantic-flight/) and his transoceanic flights plus a near floater of our own that carried a load of 3 kg (BASE 67 in 2011).

The latex in the balloon stretches like a spring obeying Hooke's law.  The more that the balloon is stretched the more force that is needed to stretch it further.  Additionally, the spring constant for latex is not constant, but actually increases dramatically in the last few centimeters of stretch before the latex breaks (and the balloon bursts).

When small amounts of lifting gas, either hydrogen or helium, are in a large balloon, there are not enough gas molecules to exert the required force to stretch the balloon to the breaking point.

Howard, KC9QBN
BASE, DePauw

On Mon, Jun 24, 2019 at 12:04 AM Gur Lavie <gurlavie@...> wrote:
Hei Bill,

Whats the physics behind a Latex becoming a floater ? 

Does it mean it was completely “under” filled ?
Can this be intentionally planned and launched ?

Thanks

Gur

On Sun, 23 Jun 2019 at 22:10 Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Fascinating flight. I believe this is the smallest balloon (600 gram) to achieve a stratospheric float. They are flying a Skytracker board without the solar panels but with a 4 AAA lithium battery pack. It worked through the entire night at -50 deg C or below and is still doing great after 27 hours aloft. After the foamcore, tape and bubble wrap the payload came in at 65 grams (about 2.3 ounces). They put 140 grams (about 5 ounces) neck lift into the 600 gram latex balloon. The ascent rate was below 250 ft/min most of the flight and it floated around 101,000 feet. It is still flying over North Dakota and has made it through mid-day so far.

Callsign: KD0VJI-11

We also launched a Skytracker from the Athens AL Field Day site this morning and it is floating nicely heading over central TN at the moment (Callsign: N4SEV-11).

Also, PB0AHX-1 is flying over Germany at the moment with a Skytracker that I modified to output 50 baud RTTY after the second APRS transmission. You can hear it on 145.300 MHz via one of the many websdr.org receivers in Europe.  I could hear it well from a couple of websdr radios in western Germany this morning.

The RTTY telemetry is displayed on tracker.habhub.org under the callsign PB0AHX.

- Bill WB8ELK





-----Original Message-----
From: Jim Reed <jim.reed@...>
To: GPSL <GPSL@groups.io>
Sent: Sun, Jun 23, 2019 9:15 am
Subject: [GPSL] Floater - was not the plan

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.



--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
602 S. College Street
Greencastle, IN 46135
hlbrooks@...
Office: (765) 658-4653
FAX: (765) 658-4732



--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
602 S. College Street
Greencastle, IN 46135
hlbrooks@...
Office: (765) 658-4653
FAX: (765) 658-4732

Re: KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

BASE_DePauw
 

I don't have a copy of the paper, but recall James Flaten of U Minnesota talking about internal and external pressure of a latex balloon back in 2011. Shortly before burst the internal pressure exceeds the external. James thought that it could be possible to use this difference to cut away from the balloon just before burst to avoid post burst chaos.

My students and I talked about floating large payloads at 20 km at GPSL2017 in Hutch.

Howard

On Tue, Jun 25, 2019, 12:27 AM Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Hi Gur,

  Empirically, I have planned quite a few latex floater flights using lightweight payloads and low free lift. My best success has been with payloads under 2.5 pounds and just a few ounces of positive lift. Less than 250 ft/min ascent rate can often achieve float with lightweight payloads. However, the best balloons to use for this are 1200 gram or larger. NG0X managed to float a payload on a 1000 gram balloon. However, this balloon (KD0VJI-11) was just a small 600 gram balloon. But the total flight train weight was just over 2 ounces with about 3 ounces of free lift and it worked great, which is quite an accomplishment for such a small balloon and an amazing peak altitude for a 600 gram balloon as well (101,430 feet).

  But apparently the amount of lifting gas was below the breaking force of the latex until the UV radiation eventually degraded the latex after a day or two.

  There was a paper presented at GPSL a few years ago describing this effect to predict the success conditions for floating a latex balloon measuring the internal pressure of the balloon during flight. Does anyone remember who gave that talk or have a copy of it?

- Bill WB8ELK




-----Original Message-----
From: BASE_DePauw <hlbrooks@...>
To: GPSL <GPSL@groups.io>
Sent: Mon, Jun 24, 2019 9:19 am
Subject: Re: [GPSL] KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Gur,

My students investigated this phenomena a few years ago, inspired by Ron K6RPT (https://www.popsci.com/technology/article/2011-12/amateur-radio-balloon-makes-record-transcontinental-transatlantic-flight/) and his transoceanic flights plus a near floater of our own that carried a load of 3 kg (BASE 67 in 2011).

The latex in the balloon stretches like a spring obeying Hooke's law.  The more that the balloon is stretched the more force that is needed to stretch it further.  Additionally, the spring constant for latex is not constant, but actually increases dramatically in the last few centimeters of stretch before the latex breaks (and the balloon bursts).

When small amounts of lifting gas, either hydrogen or helium, are in a large balloon, there are not enough gas molecules to exert the required force to stretch the balloon to the breaking point.

Howard, KC9QBN
BASE, DePauw

On Mon, Jun 24, 2019 at 12:04 AM Gur Lavie <gurlavie@...> wrote:
Hei Bill,

Whats the physics behind a Latex becoming a floater ? 

Does it mean it was completely “under” filled ?
Can this be intentionally planned and launched ?

Thanks

Gur

On Sun, 23 Jun 2019 at 22:10 Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Fascinating flight. I believe this is the smallest balloon (600 gram) to achieve a stratospheric float. They are flying a Skytracker board without the solar panels but with a 4 AAA lithium battery pack. It worked through the entire night at -50 deg C or below and is still doing great after 27 hours aloft. After the foamcore, tape and bubble wrap the payload came in at 65 grams (about 2.3 ounces). They put 140 grams (about 5 ounces) neck lift into the 600 gram latex balloon. The ascent rate was below 250 ft/min most of the flight and it floated around 101,000 feet. It is still flying over North Dakota and has made it through mid-day so far.

Callsign: KD0VJI-11

We also launched a Skytracker from the Athens AL Field Day site this morning and it is floating nicely heading over central TN at the moment (Callsign: N4SEV-11).

Also, PB0AHX-1 is flying over Germany at the moment with a Skytracker that I modified to output 50 baud RTTY after the second APRS transmission. You can hear it on 145.300 MHz via one of the many websdr.org receivers in Europe.  I could hear it well from a couple of websdr radios in western Germany this morning.

The RTTY telemetry is displayed on tracker.habhub.org under the callsign PB0AHX.

- Bill WB8ELK





-----Original Message-----
From: Jim Reed <jim.reed@...>
To: GPSL <GPSL@groups.io>
Sent: Sun, Jun 23, 2019 9:15 am
Subject: [GPSL] Floater - was not the plan

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.



--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
602 S. College Street
Greencastle, IN 46135
hlbrooks@...
Office: (765) 658-4653
FAX: (765) 658-4732

Re: KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Bill Brown
 

Hi Gur,

  Empirically, I have planned quite a few latex floater flights using lightweight payloads and low free lift. My best success has been with payloads under 2.5 pounds and just a few ounces of positive lift. Less than 250 ft/min ascent rate can often achieve float with lightweight payloads. However, the best balloons to use for this are 1200 gram or larger. NG0X managed to float a payload on a 1000 gram balloon. However, this balloon (KD0VJI-11) was just a small 600 gram balloon. But the total flight train weight was just over 2 ounces with about 3 ounces of free lift and it worked great, which is quite an accomplishment for such a small balloon and an amazing peak altitude for a 600 gram balloon as well (101,430 feet).

  But apparently the amount of lifting gas was below the breaking force of the latex until the UV radiation eventually degraded the latex after a day or two.

  There was a paper presented at GPSL a few years ago describing this effect to predict the success conditions for floating a latex balloon measuring the internal pressure of the balloon during flight. Does anyone remember who gave that talk or have a copy of it?

- Bill WB8ELK




-----Original Message-----
From: BASE_DePauw <hlbrooks@...>
To: GPSL <GPSL@groups.io>
Sent: Mon, Jun 24, 2019 9:19 am
Subject: Re: [GPSL] KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Gur,

My students investigated this phenomena a few years ago, inspired by Ron K6RPT (https://www.popsci.com/technology/article/2011-12/amateur-radio-balloon-makes-record-transcontinental-transatlantic-flight/) and his transoceanic flights plus a near floater of our own that carried a load of 3 kg (BASE 67 in 2011).

The latex in the balloon stretches like a spring obeying Hooke's law.  The more that the balloon is stretched the more force that is needed to stretch it further.  Additionally, the spring constant for latex is not constant, but actually increases dramatically in the last few centimeters of stretch before the latex breaks (and the balloon bursts).

When small amounts of lifting gas, either hydrogen or helium, are in a large balloon, there are not enough gas molecules to exert the required force to stretch the balloon to the breaking point.

Howard, KC9QBN
BASE, DePauw

On Mon, Jun 24, 2019 at 12:04 AM Gur Lavie <gurlavie@...> wrote:
Hei Bill,

Whats the physics behind a Latex becoming a floater ? 

Does it mean it was completely “under” filled ?
Can this be intentionally planned and launched ?

Thanks

Gur

On Sun, 23 Jun 2019 at 22:10 Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Fascinating flight. I believe this is the smallest balloon (600 gram) to achieve a stratospheric float. They are flying a Skytracker board without the solar panels but with a 4 AAA lithium battery pack. It worked through the entire night at -50 deg C or below and is still doing great after 27 hours aloft. After the foamcore, tape and bubble wrap the payload came in at 65 grams (about 2.3 ounces). They put 140 grams (about 5 ounces) neck lift into the 600 gram latex balloon. The ascent rate was below 250 ft/min most of the flight and it floated around 101,000 feet. It is still flying over North Dakota and has made it through mid-day so far.

Callsign: KD0VJI-11

We also launched a Skytracker from the Athens AL Field Day site this morning and it is floating nicely heading over central TN at the moment (Callsign: N4SEV-11).

Also, PB0AHX-1 is flying over Germany at the moment with a Skytracker that I modified to output 50 baud RTTY after the second APRS transmission. You can hear it on 145.300 MHz via one of the many websdr.org receivers in Europe.  I could hear it well from a couple of websdr radios in western Germany this morning.

The RTTY telemetry is displayed on tracker.habhub.org under the callsign PB0AHX.

- Bill WB8ELK





-----Original Message-----
From: Jim Reed <jim.reed@...>
To: GPSL <GPSL@groups.io>
Sent: Sun, Jun 23, 2019 9:15 am
Subject: [GPSL] Floater - was not the plan

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.



--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
602 S. College Street
Greencastle, IN 46135
hlbrooks@...
Office: (765) 658-4653
FAX: (765) 658-4732

Re: KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

BASE_DePauw
 

Gur,

My students investigated this phenomena a few years ago, inspired by Ron K6RPT (https://www.popsci.com/technology/article/2011-12/amateur-radio-balloon-makes-record-transcontinental-transatlantic-flight/) and his transoceanic flights plus a near floater of our own that carried a load of 3 kg (BASE 67 in 2011).

The latex in the balloon stretches like a spring obeying Hooke's law.  The more that the balloon is stretched the more force that is needed to stretch it further.  Additionally, the spring constant for latex is not constant, but actually increases dramatically in the last few centimeters of stretch before the latex breaks (and the balloon bursts).

When small amounts of lifting gas, either hydrogen or helium, are in a large balloon, there are not enough gas molecules to exert the required force to stretch the balloon to the breaking point.

Howard, KC9QBN
BASE, DePauw


On Mon, Jun 24, 2019 at 12:04 AM Gur Lavie <gurlavie@...> wrote:
Hei Bill,

Whats the physics behind a Latex becoming a floater ? 

Does it mean it was completely “under” filled ?
Can this be intentionally planned and launched ?

Thanks

Gur

On Sun, 23 Jun 2019 at 22:10 Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Fascinating flight. I believe this is the smallest balloon (600 gram) to achieve a stratospheric float. They are flying a Skytracker board without the solar panels but with a 4 AAA lithium battery pack. It worked through the entire night at -50 deg C or below and is still doing great after 27 hours aloft. After the foamcore, tape and bubble wrap the payload came in at 65 grams (about 2.3 ounces). They put 140 grams (about 5 ounces) neck lift into the 600 gram latex balloon. The ascent rate was below 250 ft/min most of the flight and it floated around 101,000 feet. It is still flying over North Dakota and has made it through mid-day so far.

Callsign: KD0VJI-11

We also launched a Skytracker from the Athens AL Field Day site this morning and it is floating nicely heading over central TN at the moment (Callsign: N4SEV-11).

Also, PB0AHX-1 is flying over Germany at the moment with a Skytracker that I modified to output 50 baud RTTY after the second APRS transmission. You can hear it on 145.300 MHz via one of the many websdr.org receivers in Europe.  I could hear it well from a couple of websdr radios in western Germany this morning.

The RTTY telemetry is displayed on tracker.habhub.org under the callsign PB0AHX.

- Bill WB8ELK





-----Original Message-----
From: Jim Reed <jim.reed@...>
To: GPSL <GPSL@groups.io>
Sent: Sun, Jun 23, 2019 9:15 am
Subject: [GPSL] Floater - was not the plan

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.



--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
602 S. College Street
Greencastle, IN 46135
hlbrooks@...
Office: (765) 658-4653
FAX: (765) 658-4732

Re: KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Gur Lavie
 

Hei Bill,

Whats the physics behind a Latex becoming a floater ? 

Does it mean it was completely “under” filled ?
Can this be intentionally planned and launched ?

Thanks

Gur

On Sun, 23 Jun 2019 at 22:10 Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Fascinating flight. I believe this is the smallest balloon (600 gram) to achieve a stratospheric float. They are flying a Skytracker board without the solar panels but with a 4 AAA lithium battery pack. It worked through the entire night at -50 deg C or below and is still doing great after 27 hours aloft. After the foamcore, tape and bubble wrap the payload came in at 65 grams (about 2.3 ounces). They put 140 grams (about 5 ounces) neck lift into the 600 gram latex balloon. The ascent rate was below 250 ft/min most of the flight and it floated around 101,000 feet. It is still flying over North Dakota and has made it through mid-day so far.

Callsign: KD0VJI-11

We also launched a Skytracker from the Athens AL Field Day site this morning and it is floating nicely heading over central TN at the moment (Callsign: N4SEV-11).

Also, PB0AHX-1 is flying over Germany at the moment with a Skytracker that I modified to output 50 baud RTTY after the second APRS transmission. You can hear it on 145.300 MHz via one of the many websdr.org receivers in Europe.  I could hear it well from a couple of websdr radios in western Germany this morning.

The RTTY telemetry is displayed on tracker.habhub.org under the callsign PB0AHX.

- Bill WB8ELK





-----Original Message-----
From: Jim Reed <jim.reed@...>
To: GPSL <GPSL@groups.io>
Sent: Sun, Jun 23, 2019 9:15 am
Subject: [GPSL] Floater - was not the plan

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.

KD0VJI11 latex floater over North Dakota Athens AL N4SEV11 floater and PB0AHX1 floater with APRS and RTTY

Bill Brown
 

Fascinating flight. I believe this is the smallest balloon (600 gram) to achieve a stratospheric float. They are flying a Skytracker board without the solar panels but with a 4 AAA lithium battery pack. It worked through the entire night at -50 deg C or below and is still doing great after 27 hours aloft. After the foamcore, tape and bubble wrap the payload came in at 65 grams (about 2.3 ounces). They put 140 grams (about 5 ounces) neck lift into the 600 gram latex balloon. The ascent rate was below 250 ft/min most of the flight and it floated around 101,000 feet. It is still flying over North Dakota and has made it through mid-day so far.

Callsign: KD0VJI-11

We also launched a Skytracker from the Athens AL Field Day site this morning and it is floating nicely heading over central TN at the moment (Callsign: N4SEV-11).

Also, PB0AHX-1 is flying over Germany at the moment with a Skytracker that I modified to output 50 baud RTTY after the second APRS transmission. You can hear it on 145.300 MHz via one of the many websdr.org receivers in Europe.  I could hear it well from a couple of websdr radios in western Germany this morning.

The RTTY telemetry is displayed on tracker.habhub.org under the callsign PB0AHX.

- Bill WB8ELK





-----Original Message-----
From: Jim Reed <jim.reed@...>
To: GPSL <GPSL@groups.io>
Sent: Sun, Jun 23, 2019 9:15 am
Subject: [GPSL] Floater - was not the plan

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.

Floater - was not the plan

Jim Reed
 

KD0VJI-11

Our local HAM radio club asked us to put a balloon they could track for their field day. I guess we messed up in the helium calculation. 😊

It turned into a floater. It is a 600 gram latex balloon flying one of Bill’s skytrackers. Been floating for about a day now at 100k. Kinda neat to see the track.

Just thought I would share for those that are into that stuff.

Stowaway crescent wrench

Michael Hojnowski
 

Gang,

While unpacking from GPSL, I found a nice, blackened, crescent wrench in my launch toolbox that wasn't mine.  Someone must have swept it up while helping me pack, and accidentally tossed it into my toolbox.

If that belongs to you, and you have enough sentimental attachment to it that you'd like me to mail it to you, just let me know. Otherwise, I will put it to excellent use myself.

Thanks!
Mike / KD2EAT
Wrench Thief

Re: Need a NEMA log

Mark Patton
 

This is not raw NMEA data but parsed 1 second data in a spreadsheet.  This link is for the recent GPSL flight, and both payloads were on the same flight string.  If you search for other flight recaps on the web site, you will find similar data for other flights.

 

https://eoss.org/node/3562

 

Mark – KC0D

 

GPSL 2019 Symposium Videos

Mike, n0mpm
 

All the presentation videos as well as bonus pictures can be found at:
https://m.youtube.com/channel/UC_5T3R8arKLWKymoNhTNKiQ/videos

Re: Need a NEMA log

Steve Aerospace
 

Here is one I think:

    https://drive.google.com/file/d/1kPggddrY6XEHVHylGjTU2moUN4Bt7bwz/view?usp=sharing

    Steve G8KHW/AJ4XE


On 20/06/2019 22:09, Derek Sigler via Groups.Io wrote:
Anthony,
It's a good start, but I really do need the entire flight data.
Thanks,
-derek


On Thursday, June 20, 2019, 03:39:18 PM CDT, Anthony Stirk <upuaut@...> wrote:


Hey Derek,

Has this for quite a while don't recall who sent me it but it was a flight where the air mode wasn't set on Ublox so it screws up at 12km.

Hope its of help

Anthony

On Thu, Jun 20, 2019 at 7:39 PM Derek Sigler via Groups.Io <dereksigler=yahoo.com@groups.io> wrote:
Would anyone be able to provide me with a text dump of all NEMA strings throughout a flight?  Not just the broadcasts, but like a file from a data logger attached to the GPS.
Thanks,
-derek

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Random Engineering Ltd
steve@...
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Re: Need a NEMA log

Anthony Stirk
 

Chop the bit it the middle out where it goes above 12km and you get a flight :)

On Thu, Jun 20, 2019 at 10:09 PM Derek Sigler via Groups.Io <dereksigler=yahoo.com@groups.io> wrote:
Anthony,
It's a good start, but I really do need the entire flight data.
Thanks,
-derek


On Thursday, June 20, 2019, 03:39:18 PM CDT, Anthony Stirk <upuaut@...> wrote:


Hey Derek,

Has this for quite a while don't recall who sent me it but it was a flight where the air mode wasn't set on Ublox so it screws up at 12km.

Hope its of help

Anthony

On Thu, Jun 20, 2019 at 7:39 PM Derek Sigler via Groups.Io <dereksigler=yahoo.com@groups.io> wrote:
Would anyone be able to provide me with a text dump of all NEMA strings throughout a flight?  Not just the broadcasts, but like a file from a data logger attached to the GPS.
Thanks,
-derek

Re: Need a NEMA log

Derek Sigler
 

Anthony,
It's a good start, but I really do need the entire flight data.
Thanks,
-derek


On Thursday, June 20, 2019, 03:39:18 PM CDT, Anthony Stirk <upuaut@...> wrote:


Hey Derek,

Has this for quite a while don't recall who sent me it but it was a flight where the air mode wasn't set on Ublox so it screws up at 12km.

Hope its of help

Anthony

On Thu, Jun 20, 2019 at 7:39 PM Derek Sigler via Groups.Io <dereksigler=yahoo.com@groups.io> wrote:
Would anyone be able to provide me with a text dump of all NEMA strings throughout a flight?  Not just the broadcasts, but like a file from a data logger attached to the GPS.
Thanks,
-derek

Re: Need a NEMA log

Anthony Stirk
 

Hey Derek,

Has this for quite a while don't recall who sent me it but it was a flight where the air mode wasn't set on Ublox so it screws up at 12km.

Hope its of help

Anthony


On Thu, Jun 20, 2019 at 7:39 PM Derek Sigler via Groups.Io <dereksigler=yahoo.com@groups.io> wrote:
Would anyone be able to provide me with a text dump of all NEMA strings throughout a flight?  Not just the broadcasts, but like a file from a data logger attached to the GPS.
Thanks,
-derek

Need a NEMA log

Derek Sigler
 

Would anyone be able to provide me with a text dump of all NEMA strings throughout a flight?  Not just the broadcasts, but like a file from a data logger attached to the GPS.
Thanks,
-derek

Photos and Videos

Garrett, Mark
 

Here are my photos and videos of the launch.  Feel free to use at your discretion.   You can find them here:

--
Mark Garrett, KA9SZX
Tri States Public Radio
WIUM Macomb, IL
WIUW Warsaw, IL
WVKC Galesburg, IL
K292GR Burlington, IA

Re: Friday's live stream recording?

Mark Conner N9XTN
 

Great to hear - I was hoping it wasn't accidentally lost!

- Mark

On Tue, Jun 18, 2019 at 1:00 PM Mike, n0mpm <morgamp52@...> wrote:
Jim is in the process of splitting the 6+ hours into 6 individual presentations...he has a very slow internet connection so it takes him a few days....should be back soon..
mike

Re: Friday's live stream recording?

Mike, n0mpm
 

Jim is in the process of splitting the 6+ hours into 6 individual presentations...he has a very slow internet connection so it takes him a few days....should be back soon..
mike

Friday's live stream recording?

Mark Conner N9XTN
 

I was going to forward the live stream captured on Friday that Jim from PENS was taking and the link says the video is unavailable.  Is it somewhere else now?  This is the link I was trying to use: 

Pella ARC stream (lapel mic audio): https://youtu.be/TNIlFjB2meY

73 de Mark N9XTN