I am planning to do a high altitude balloon launch and I was wondering if anyone on this forum could help me figure out a few things.(adsbygoogle = window.adsbygoogle || []).push({});

The payload+the balloon+the parachute= weigh around 2 pounds.

I am looking to get 3 pounds of free lift (each pound of free lift equals 300 feet per minute accent). I believe that one square foot of helium can lift 28grams.

The balloon that I am planning to use is the KCI 800 from this site http://kaymont.com/pages/sounding-balloons.cfm [Broken] it has all the details about the balloon.

I am looking for the amount of helium that would be required to lift that weight at that rate, and I am wondering what the diameter of the balloon should be so I know that it is full.

Your help will be greatly appreciated,

Thank you.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Help figuring out what a balloon diameter should be with x amount of helium.

**Physics Forums | Science Articles, Homework Help, Discussion**