Date   

Barometric pressure sensor for HABs?

Michael Hojnowski
 

Heya,

I've been using GPS for altitude on my balloons, but I'm working with a student who's interested in trying a barometric pressure sensor attached to an arduino with my next HAB flight.   I've got a pile of BMP180s laying around, but  they only seem to be rated for 9,000m.  It looks like the BMP280 has the same issue.  I'm expecting 36,000 meters or so.  So, two questions.

1) Is there a better series of devices to use?
2) The last time I screwed with the BMP180, the altitude formulas I found didn't seem to work.  It was thousands of feet off, just at ground level.  If there is a "defacto" subroutine to use for calculating altitude from a pressure sensor that everyone's using for HABs, I'd love a pointer.

Thanks for any tips!
Mike / KD2EAT


Re: Floater balloon

Bruce Coates
 

Hi Bill

That would be great.

Thanks

Bruce

------ Original message------
From: Bill Brown via Groups.Io
Date: Tue, Aug 28, 2018 1:45 PM
Cc:
Subject:Re: [GPSL] Floater balloon

Bruce. No more than 3 grams free lift. But if using two Mylars you can use 3 grams of free lift each. I have never tried to do a Mylar 36-inch with that heavy of a payload. My heavies! t successful floater was about 22 grams i believe. Use Qualatex brand. There is a spreadsheet by the UKHAS folks for predicting float altitudes   I can email u after work. - Bill WB8ELK


On Aug 28, 2018, at 7:29 AM, Bruce Coates <bruce.coates@...> wrote:

Hi

I'm planning on launching a floater balloon from Saskatoon in the near future and it just occured to me that i know just enough to be damgerous.

My payload  is complete and weighs in at about 40 grams, quite a bit heavier than i had hoped. I have 36 inch mylar balloons which should provide over 75 grams of neck lift if they were fully inflated with hydrogen.

I have just 3 questions:

1. Given the mass of the payload, how much net lift should I use?  I'm thinking of 5 to 10 grams. 
2. How do I run predictions for a floater?  Given my northern latitude, I want the initial part of the flight to travel southward over southern Canada or the US so I can track it for the first part of the flight.
3. What other questions should I be asking?

I'm all ears.

73, Bruce - VE5BNC


Re: Floater balloon

Bill Brown
 

Bruce. No more than 3 grams free lift. But if using two Mylars you can use 3 grams of free lift each. I have never tried to do a Mylar 36-inch with that heavy of a payload. My heaviest successful floater was about 22 grams i believe. Use Qualatex brand. There is a spreadsheet by the UKHAS folks for predicting float altitudes   I can email u after work. - Bill WB8ELK


On Aug 28, 2018, at 7:29 AM, Bruce Coates <bruce.coates@...> wrote:

Hi

I'm planning on launching a floater balloon from Saskatoon in the near future and it just occured to me that i know just enough to be damgerous.

My payload  is complete and weighs in at about 40 grams, quite a bit heavier than i had hoped. I have 36 inch mylar balloons which should provide over 75 grams of neck lift if they were fully inflated with hydrogen.

I have just 3 questions:

1. Given the mass of the payload, how much net lift should I use?  I'm thinking of 5 to 10 grams. 
2. How do I run predictions for a floater?  Given my northern latitude, I want the initial part of the flight to travel southward over southern Canada or the US so I can track it for the first part of the flight.
3. What other questions should I be asking?

I'm all ears.

73, Bruce - VE5BNC


Floater balloon

Bruce Coates
 

Hi

I'm planning on launching a floater balloon from Saskatoon in the near future and it just occured to me that i know just enough to be damgerous.

My payload  is complete and weighs in at about 40 grams, quite a bit heavier than i had hoped. I have 36 inch mylar balloons which should provide over 75 grams of neck lift if they were fully inflated with hydrogen.

I have just 3 questions:

1. Given the mass of the payload, how much net lift should I use?  I'm thinking of 5 to 10 grams. 
2. How do I run predictions for a floater?  Given my northern latitude, I want the initial part of the flight to travel southward over southern Canada or the US so I can track it for the first part of the flight.
3. What other questions should I be asking?

I'm all ears.

73, Bruce - VE5BNC


Re: 360 Balloon Launch

Bruce Coates
 

WOW

I can't wait to get home and try my vr goggles. 

Thanks for posting this

73, Bruce

------ Original message------
From: David Stillman KI6YMZ
Date: Tue, Aug 21, 2018 9:21 AM
Cc:
Subject:Re: [GPSL] 360 Balloon Launch

Phew, editing 360 video sure does take time!

I ran the video files through the GoPro software to stabilize it using the IMU data, and that took about 60 hours and resulted in a single file that is half a terabyte. I cut it down a bit and put it on YouTube, they have a nice 360 player and support most VR systems. I'd not recommend watching the burst and landing in a headset if you get seasick!

I tagged the launch, burst, and landing in the description if you're just after the juicy bits, and edited in a bit of time in between to get a sense at various altitudes on the way up and down.


I can upload the full flight if there is any interest.

Thanks EOSS for a great launch and recovery! We were fortunate to be a quarter mile from the landing location and watch the payload land. If you look close you can see our line of cars on the road nearest the landing location.

73,

David Stillman
KI6YMZ


On Sun, Aug 19, 2018, at 16:36, dampguy wrote:
I flew one 3 years ago. A picture is posted here somewhere :D





Re: 360 Balloon Launch

David Stillman KI6YMZ
 

Phew, editing 360 video sure does take time!

I ran the video files through the GoPro software to stabilize it using the IMU data, and that took about 60 hours and resulted in a single file that is half a terabyte. I cut it down a bit and put it on YouTube, they have a nice 360 player and support most VR systems. I'd not recommend watching the burst and landing in a headset if you get seasick!

I tagged the launch, burst, and landing in the description if you're just after the juicy bits, and edited in a bit of time in between to get a sense at various altitudes on the way up and down.


I can upload the full flight if there is any interest.

Thanks EOSS for a great launch and recovery! We were fortunate to be a quarter mile from the landing location and watch the payload land. If you look close you can see our line of cars on the road nearest the landing location.

73,

David Stillman
KI6YMZ


On Sun, Aug 19, 2018, at 16:36, dampguy wrote:
I flew one 3 years ago. A picture is posted here somewhere :D





Re: 360 Balloon Launch

dampguy
 

I flew one 3 years ago. A picture is posted here somewhere :D


Re: 360 Balloon Launch

David Stillman KI6YMZ
 

I flew a GoPro Fusion on Saturday and have about 150GB of footage... it certainly is a lot to process :) I'll see if I can cut it down and get something online soon.


On Thu, Aug 16, 2018, at 20:35, L. Paul Verhage KD4STH wrote:
The problem I foresee is having a PC powerful enough to stitch the video in a reasonable amount of time.

On Thu, Aug 16, 2018, 8:29 PM Bruce Coates <bruce.coates@...> wrote:
Great stuff.  I'll be watching.

Weather (and forest fire smoke) permitting we're going to fly SABRE-27 next weekend.  Nothing special.  Just a traditional camera payload.


On 2018-08-16 8:11 PM, L. Paul Verhage KD4STH wrote:
I will fly one soon, but it may be a huge file when done. 

On Thu, Aug 16, 2018, 7:16 PM Bruce Coates <bruce.coates@...> wrote:
Hi Paul

You had me all worked up for a minute thinking you had flown a 360 degree camera.

Very interesting though.

73, Bruce - VE5BNC


On 2018-08-15 10:30 AM, L. Paul Verhage KD4STH wrote:
I posted a short 360 video I recorded of the balloon launches at the Nebraska Star Party. 

I shared a balloon with NSTAR and the second balloon was launched by the Nebraska Space Grant.

The video is located at, https://youtu.be/--p-FAzLLmo


--

Dr. L. Paul Verhage
Near Space Evangelist





Re: 360 Balloon Launch

L. Paul Verhage KD4STH
 

The problem I foresee is having a PC powerful enough to stitch the video in a reasonable amount of time.


On Thu, Aug 16, 2018, 8:29 PM Bruce Coates <bruce.coates@...> wrote:
Great stuff.  I'll be watching.

Weather (and forest fire smoke) permitting we're going to fly SABRE-27 next weekend.  Nothing special.  Just a traditional camera payload.

On 2018-08-16 8:11 PM, L. Paul Verhage KD4STH wrote:
I will fly one soon, but it may be a huge file when done. 

On Thu, Aug 16, 2018, 7:16 PM Bruce Coates <bruce.coates@...> wrote:
Hi Paul

You had me all worked up for a minute thinking you had flown a 360 degree camera.

Very interesting though.

73, Bruce - VE5BNC

On 2018-08-15 10:30 AM, L. Paul Verhage KD4STH wrote:
I posted a short 360 video I recorded of the balloon launches at the Nebraska Star Party. 

I shared a balloon with NSTAR and the second balloon was launched by the Nebraska Space Grant.

The video is located at, https://youtu.be/--p-FAzLLmo

--
Dr. L. Paul Verhage
Near Space Evangelist



Re: 360 Balloon Launch

Bruce Coates
 

Great stuff.  I'll be watching.

Weather (and forest fire smoke) permitting we're going to fly SABRE-27 next weekend.  Nothing special.  Just a traditional camera payload.

On 2018-08-16 8:11 PM, L. Paul Verhage KD4STH wrote:
I will fly one soon, but it may be a huge file when done. 

On Thu, Aug 16, 2018, 7:16 PM Bruce Coates <bruce.coates@...> wrote:
Hi Paul

You had me all worked up for a minute thinking you had flown a 360 degree camera.

Very interesting though.

73, Bruce - VE5BNC

On 2018-08-15 10:30 AM, L. Paul Verhage KD4STH wrote:
I posted a short 360 video I recorded of the balloon launches at the Nebraska Star Party. 

I shared a balloon with NSTAR and the second balloon was launched by the Nebraska Space Grant.

The video is located at, https://youtu.be/--p-FAzLLmo

--
Dr. L. Paul Verhage
Near Space Evangelist



Re: 360 Balloon Launch

L. Paul Verhage KD4STH
 

I will fly one soon, but it may be a huge file when done. 


On Thu, Aug 16, 2018, 7:16 PM Bruce Coates <bruce.coates@...> wrote:
Hi Paul

You had me all worked up for a minute thinking you had flown a 360 degree camera.

Very interesting though.

73, Bruce - VE5BNC

On 2018-08-15 10:30 AM, L. Paul Verhage KD4STH wrote:
I posted a short 360 video I recorded of the balloon launches at the Nebraska Star Party. 

I shared a balloon with NSTAR and the second balloon was launched by the Nebraska Space Grant.

The video is located at, https://youtu.be/--p-FAzLLmo

--
Dr. L. Paul Verhage
Near Space Evangelist


Re: 360 Balloon Launch

Jim Reed
 

We flew a couple 360s a couple years ago. Cool footage. 


I enjoy reading the conversations you folks have. You are a knowledgeable group. We just know how to do it. 😀

Jim


On Aug 16, 2018, at 8:16 PM, Bruce Coates <bruce.coates@...> wrote:

Hi Paul

You had me all worked up for a minute thinking you had flown a 360 degree camera.

Very interesting though.

73, Bruce - VE5BNC

On 2018-08-15 10:30 AM, L. Paul Verhage KD4STH wrote:
I posted a short 360 video I recorded of the balloon launches at the Nebraska Star Party. 

I shared a balloon with NSTAR and the second balloon was launched by the Nebraska Space Grant.

The video is located at, https://youtu.be/--p-FAzLLmo

--
Dr. L. Paul Verhage
Near Space Evangelist


Re: 360 Balloon Launch

Bruce Coates
 

Hi Paul

You had me all worked up for a minute thinking you had flown a 360 degree camera.

Very interesting though.

73, Bruce - VE5BNC

On 2018-08-15 10:30 AM, L. Paul Verhage KD4STH wrote:
I posted a short 360 video I recorded of the balloon launches at the Nebraska Star Party. 

I shared a balloon with NSTAR and the second balloon was launched by the Nebraska Space Grant.

The video is located at, https://youtu.be/--p-FAzLLmo

--
Dr. L. Paul Verhage
Near Space Evangelist


360 Balloon Launch

L. Paul Verhage KD4STH
 

I posted a short 360 video I recorded of the balloon launches at the Nebraska Star Party. 

I shared a balloon with NSTAR and the second balloon was launched by the Nebraska Space Grant.

The video is located at, https://youtu.be/--p-FAzLLmo

--
Dr. L. Paul Verhage
Near Space Evangelist


WB4APR-11 over New England

Mark Conner N9XTN
 


Presentations

L. Paul Verhage KD4STH
 

I didn't ask for them at the conference, but please email me your GPSL presentation and Mark Conner can post them online for us.

Thanks


Re: Collision video

Mark Conner N9XTN
 

I think it's more startling that we filled two separate balloons with very different weights (ours was ~2 lbs, theirs was at least 5) and managed to hit almost exactly the same ascent rate, drift some distance apart, then come back together.  

I'd bet this couldn't be done intentionally, other than having them bump together within seconds after launch (which ours almost did).  Having it happen >10 minutes afterwards?  The odds have to be astronomical.

73 de Mark N9XTN

On Wed, Aug 8, 2018 at 11:48 AM Joe WB9SBD <nss@...> wrote:
Isn't that incredibly interesting.

Has anyone have any idea why the two balloons would be moving so differently in the same air mass?

Joe WB9SBD

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com

On 8/8/2018 10:59 AM, Mark Conner N9XTN wrote:

73 de Mark N9XTN



Re: Collision video

Joe WB9SBD
 

Isn't that incredibly interesting.

Has anyone have any idea why the two balloons would be moving so differently in the same air mass?

Joe WB9SBD

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com

On 8/8/2018 10:59 AM, Mark Conner N9XTN wrote:

73 de Mark N9XTN



Collision video

Mark Conner N9XTN
 


Re: First ARHAB/ARHAB collision?

Mark Conner N9XTN
 

Here's a frame grab right after the collision.

73 de Mark N9XTN

On Tue, Aug 7, 2018 at 7:20 PM Mark Conner <mconner1@...> wrote:
NSTAR 18-B (paired with NearSys) and Nebraska Space Grant launched this morning at the Nebraska Star Party south of Valentine NE.  At about 14,000 ft, NSTAR suddenly began descending and landed only a few miles away from the launch site.

In talking with the NSG crew on the way home, they looked at their camera footage and it was clear to them that their payload collided with our balloon at around that altitude.

Here is the track of the two balloons:

I think this could be a first for an ARHAB/ARHAB collision (beyond the trivial case of right after launch, perhaps).  

I don't yet have the video because there is only weak and low-bandwidth cell coverage at the Nebraska Star Party site.  I'll post links once the video is available.

73 de Mark N9XTN