Re: Superpressure balloon valve / was Re: [GPSL] K5NOT-11 WSPR Balloon Failure
It was a 1500 Kaymont balloon.toggle quoted messageShow quoted text
Knowing the pressure differential is extremely low. When I tested the ping pong ball, I know it leaked badly. The texture of the ball just would not give a good seal.
I went with the silicone on both the "O" ring and the ball.
I also went with a pressure of the spring, Actually a spring I just could not find a spring suitable. So I used a left over strip of balloon latex, attached to the ball and to a acrylic shaft.
The shaft was rotated to tighten the tension on the ball and seal.
I made it as loose as possible,, just enough to make the seal, and I mean barely!
I was worried that motion would even break the seal. It was that slight.
Even as light as that was, it was not light enough, the flight still had a standard flight profile with rise to burst altitude, and did still pop.
On 7/21/2020 3:41 PM, Hank Riley via groups.io wrote: