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I don't think it would work, as the pigeons must be pushing down on something in order to gain lift. However, if they were in freefall inside the lorry it may be different - any physicists care to help?
the birds are essentially sucking themselves upwards
Quotethe birds are essentially sucking themselves upwardsA dodgy statement.
If I stand in a truck on a bathroom scale with a hawk on my arm and the hawk flies off, what happens? Does the scale show that I am lighter? I think so. And the truck would not show that it is lighter now?
The birds will be flying. Since they are not hovering close to the ground but are engaged in forward flight at a reasonable height of the floor...
And, who changed the subject line of the thread? Just curious. Why?