[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 scenario

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. PhD. Candidate Center for Functional Anatomy and Evolution Johns Hopkins School of Medicine 1830 E. Monument Street Baltimore, MD 21205 (443) 280-0181 habib@jhmi.edu