On 27 Sep, 10:12, The Natural Philosopher
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.