On 27 Sep, 21:31, Gib Bogle wrote:
On 28/09/2010 5:51 a.m., harry wrote:





On 27 Sep, 10:12, The Natural
wrote:
Gib Bogle wrote:
On 27/09/2010 9:49 p.m., The Natural Philosopher wrote:
Gib Bogle wrote:
On 27/09/2010 8:51 p.m., harry wrote:
On 27 Sep, 02:20, *wrote:
On 26 Sep, 19:51, *wrote:

ie Complete
********.http://www.youtube.com/watch?v=1IsaM...eature=related

Gravity powered aircraft? As useful as a lead Zeppelin.

Never a mention of friction.

That's just the start of the reasons for infeasibility.

Actually its ultimately not infeasible, just impractical and inefficient.

* From a cursory glance (it deserves no more) all it is conceptually,
is a glider
and a balloon. Balloon lifts glider, glider glides to where it has to go.

The energy to turn a lighter than air volume of gas into a smaller
compressed
volume that then acquires sufficient weight to act as a glider, is not
mentioned.

The whole system is claimed to be self-sufficient. *As I recall the
compression is powered by the propellers acting as turbines as the plane
glides down. *It's perpetual motion.

Oh? I couldn't be arsed to listen that far.

There was one interesting idea that was mooted, that on analysis I
couldn't find a flaw with: A wind powered boat or vehicle that could
sail or drive directly into the wind using a turbine facing the wind to
drive a water prop or wheels..also said to be capable of going faster
than the wind..directly downwind..less sure about that, though.- Hide quoted text -

- Show quoted text -

An ordinary sail boat can sail faster than the wind without the
benifit of strange turbines.
It's common *knowledge to anyone with even a slight knowledge of
physics.
http://en.wikipedia.org/wiki/Sailing..._than_the_wind

Yes, I know about sailing. *Did you read the post? *Here, I'll cut out the
appropriate part for you, to make it easier:
"A wind powered boat or vehicle that could sail or drive directly into the wind
using a turbine facing the wind to drive a water prop or wheels"
Do you see the reference to "using a turbine"? *OK, now the question is this:
"Can a WIND TURBINE-POWERED vessel or vehicle go faster than the wind DIRECTLY
DOWNWIND?" *Think about it.
By the way, a sail-driven craft cannot go faster than the wind DIRECTLY DOWNWIND
either. *Get it? *Your slight knowledge of physics should be adequate to grasp this.- Hide quoted text -

- Show quoted text -

Obviously is soon as it went "as fast as the wind downwind" there
would be no wind (relative to the machine/boat etc). Therefore
impossible.