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Re: Campbell's even crazier than a MANIAC? (archeopteryx climbing)
There are environments today, mainly coastal, where a pure glider with a 3-4:1
aspect ratio and less than a 4:1 glide can stay aloft for hours and travel
miles. In the absence of competition, I have no problem imagining a pure glider
using these conditions regularly, developing a more efficient wing, and over
All it requires is a coincident of geography to have a forest with gliding
arboreal animals living in it, to be near a suitable ridge with a fairly
consitent wind (most often due to the ocean or a large body of water at a
fairly consistent temperature).
Many such places exist today, except the gliding arboreal animals are also
capable of powered flight, and are in fact birds.
Also worth noting is anything capable of powered flight, is capable of gliding
Even rotorcraft like helicopters can glide (and indeed there are foot launched
autogyro gliders - i can supply video)
So I find the concept of a powered flight ability before a gliding ability as
some proposed completely false (although some of their examples of gliding were
albatross and vultures - such specialized gliding forms aren't needed to glide,
and soaring should be differentiated from gliding).
Its either powered flight in tandem with gliding, or gliding, then powered
I think its highly likely powered flight did not come before soaring.
--- On Fri, 9/26/08, don ohmes <firstname.lastname@example.org> wrote:
> In my opinion, two scenarios are: 1) in a 'pre-powered flight'
> environment, dominated by gliders, repeated power dives (and subsequent
> pullouts) could convey advantage to predator and prey alike, assuming
> both are gliders. 2) where glide length might convey tactical advantage
> to a predator, such as a bipedal perch-hunter in an open or semi-open
> environment, gliding down on a terrestrial prey could culminate in a
> running/flapping style of pursuit (again, in a pre-power world).
> This last would be the lifestyle of Arch. immediate ancestors, in my
> personal cartoon...