Hmm.

Hi everyone,

What do we know for sure...

It went at least as high as launch #2 (15,000 ft), since this one had similarly-filled balloons but less weight (145 grams lift, 115 grams of payload which includes 29 grams of passively deployable ballast. Launch2 weighed about 132 grams).

We sealed the balloons valves with silicon this time, which "could have solved" our H2 leak problem. If not, and we still lose buoyancy at the same rate (1 g per hour) then we might fly 60 hours after releasing ballast mid-way.

At 15,000 feet it should be averaging 30 MPH due west towards New York City, and will get to the Atlantic after 800 miles. After that, it's hard to say where it will go. It won't be in the jet stream, so it could head to Spain or it might do something less useful.

At 25,000 feet it might be headed a little more north, and traveling between 50-90 MPH towards Maine/Nova Scotia, with about 1300 miles needed to get to the Atlantic.

If it really got near the jet stream towards Maine, it'll fly to Greenland, Iceland, then back to England after about 3000 miles. From there, it goes to France, then Poland, then north through Russia.

So... we'll give it 4-5 days. Batteries might last 8-10 days. Maybe I'll contact T-Mobile to see if they can shed any light.