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I used the Kaymont 600g, and used the “jumbo” sized tank from Party City, which is their largest tank, and I only used half the helium, if that, to a fill diameter of over 5 feet. Total weight was around 2 pounds, and estimated burst altitude was 89,775 feet.

My rise ascent would have been around 500 ft/min approx. Took just under 3 hours to reach maximum altitude before bursting for this launch. More info at my site if needed.

Cody

Launched Sept. 5th, 2010
http://www.aerialparade.com