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byronmfox(at)gmail.com
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 Posted: Tue Oct 11, 2011 11:02 am Post subject: An Airplane That Flies like A Bird |
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... Blitz
Byron M. Fox
80 Milland Drive
Mill Valley, CA 94941
415-307-2405
[quote][b]
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CD 2.0
Joined: 21 Feb 2011
Posts: 43
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| Posted: Tue Oct 11, 2011 10:35 pm Post subject: Re: An Airplane That Flies like A Bird |
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Sure... there may be great applications for this technology, but it would be impractical to use it as an airplane or helicopter. It's more specifically, strength to weight ratio. Although it only takes 80watts to make 400g fly, if they have a ‘birdplane” with a weight of 5000 lbs maybe they’ll need to plug it into a nuclear reactor… 
Ok, if we have, which we don’t have, lightweight materials that would make any plane or helicopter weigh around 100kg…. the largest "bird" that ever lived, the Quetzalcoatlus was around that weight… since it takes an average of 50watts to make 0,5kg fly, then it would take 10.000 watts for 100kg (220 pounds). Not to mention that currently there is no material that could take this kind of force while still being light. What works in low weight doesn’t necessarily mean it could work on anything bigger so based on the current technological standards, this experiment wouldn’t be of any use.
We actually have robots that have higher strength to weight ratio than a human. They make all your cars, etc. But the question is whether we can balance everything such that all this becomes portable and operates in a fashion that mother nature has invented.
They are also working on a hummingbird, apparently "quick flapping" is good for small-scale aerodynamics.
Carl
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brian(at)lloyd.com
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| Posted: Wed Oct 12, 2011 6:54 am Post subject: An Airplane That Flies like A Bird |
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On Tue, Oct 11, 2011 at 11:35 PM, CD 2.0 <dbowie2007(at)hotmail.com> wrote:
| Quote: |
Sure... there may be great applications for this technology, but it would
be impractical to use it as an airplane or helicopter. It's more
specifically, strength to weight ratio. Although it only takes 80watts to
make 400g fly, if they have a birdplane with a weight of 5000 lbs maybe
theyll need to plug it into a nuclear reactor
|
Well, let's assume 400kg (880 lbs). That is just under what my RV-4 weighed
empty and more than my Piper Clipper weighed empty. That would require 80kW
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