Oli Glaser wrote:

> On 29/01/2011 13:05, Gerhard Fiedler wrote:
>> Without resulting average momentum at the bottom of the box, there is
>> no force, and hence, I'm convinced that if you make the box big
>> enough, what you'll have is a box that has the same weight with and
>> without a plane flying in it, Newton and everything considered.
>=20
> This is incorrect.

I came to this conclusion, too. But I don't yet fully understand the
mechanisms that make this work, especially around the momentum
preservation (see also the other part of the question in an email in
this thread I just sent).=20

Gerhard
--=20
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