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Re: four winged Archaeopteryx

Note that I have no objection to mobile aerodynamic feathers and realize that 
are, but by analogy, does the statement below mean that proposing immobile 
fixed wings
for aircraft would be a very strong claim?  I note in passing, that immobile 
wings are not unusual in aircraft, and that they are expected to work for 

Graydon wrote:

> but proposing an immobile aerodynamic feather _and
> expecting to work for flight_ is a very strong claim.