Caporegime
- Joined
- 1 Mar 2008
- Posts
- 26,303
If we assume the van is a sealed container, then no. The pigeons won't be resting on the floor of the van any more, but the thrust they generate to keep themselves airborne would push the van down with equal force. That is, before all of the pigeons die of asphyxiation and end up resting on the van floor anyway.
But, in a normal van? Perhaps with a window left slightly ajar?