There still searching and they say they only have about 2 hrs of light left to search for him. Now there talking about temperture issues for tonight and the little boy.
Hmm ... the pic I saw of the deflated balloon in a field looked rather small.
I found another one shot when it was down, but still partially inflated. It looks a lot bigger in that shot.
If that thing was really 20' across an 5' high, and the sides were fairly straight up when inflated, that's a lot more helium than I thought it would hold. That might lift 350 lbs!
Oh well, my fooling with a calculator won't solve this one ...