[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: pteros have lift-off
I think we talked about this earlier and the need for a pole vault
I think you talked about the need for a pole vault scenario -- I
don't recall that anyone else sees it as a requirement.
Actually, this one is my fault: I mentioned the "vault" phase of the
launch on several occasions, and likened the forelimb to a folding
vaulting pole at least a couple of times. Apparently there was some
confusion as a result.
When I refer to "vaulting" in the context of quad launch, it simply
means that the animal is pushing onto the forelimbs, pivoting over the
manus to some degree, from a standing start. The hindlimbs give a
dual push to initiate this launch phase, but there isn't an aerial
phase leap coming off the hindlimbs alone, nor is there a running start.
Which brings me back to the issue of running launches once again.
Just to reiterate: running launch is, by and large, not associated
with greater power, better launch speed, or a solution to larger size
in living flyers. It is a secondarily derived launch state in many
living birds associated with taxa that utilize takeoffs from compliant
surfaces (i.e. water).
Michael Habib, M.S.
Center for Functional Anatomy and Evolution
Johns Hopkins School of Medicine
1830 E. Monument Street
Baltimore, MD 21205