Wonderful show with loads of beautiful black and white and color footage going back to the first manned high altitude capsules of the 1930's which led to a space race of sorts between the US and the

My guess would be that the pressure drops as the balloon is released because the envelope is under less tension - held to the ground the full lift of the balloon is transferred into envelope

Now that I am back from my 4995 mile trip to GPSL, I thought I would finish out this thread by posting my graphs from my internal pressure measurements. Below is the original email and the attached

10 DB too much power. Joe WB9SBD The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com

https://www.tracksoar.com/tracksoar-comparison-2/ -----------------------------------------From: "Mustafa Tan" To: GPSL@groups.io Cc: Sent: Saturday June 29 2019 3:05:17PM Subject: Re: [GPSL]

https://www.byonics.com/mtt4b -----------------------------------------From: "Mustafa Tan" To: GPSL@groups.io Cc: Sent: Saturday June 29 2019 3:05:17PM Subject: Re: [GPSL] Trackers Hi Joe,

Hi Joe, Check this out: https://github.com/lightaprs/LightAPRS-1.0 TA2MUN-- Mustafa Tan http://www.iphoneturkey.com

Watch this space....

I really Miss these Units. What is out there that is closest to it? Joe WB9SBD -- The Original Rolling Ball Clock

As a friend of mine likes to say: If its worth engineering it is worth over engineering. He has been working on his automated can crusher for at least 3 years. I am interested in what makes the

I presented some data on measurements at the neck of a balloon during the flight quite some time back. I did not equate it to floater success as success was not yet achieved with our tests, :) but it

I wonder if all the "sciencing" is overkill. Couldn't you just fly it like a standard pico. Give yourself 5-10 grams free lift, let go, and walk away? It'll either burst or it

I have Jerry's data here somewhere also. I'll also try to find it. One thing I do remember tho, the differential was very very small. Which makes total sense, if you do

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

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

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

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

Gur, My students investigated this phenomena a few years ago, inspired by Ron K6RPT

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

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