I think the electronics problems are trivial compared with the matter
of maintaining the platform at altitude and geosynchronous.

There is not much air for a lighter than air ship to float in at that
altitude. A quick estimate of 21km is about 65,000 feet. It would seem
to me that a platform that could hover at that altitude keeping pace
with the earths rotation could also circumnavigate the earth in 24
hours in the direction of the rotation.

The energy required to maintain that hover is going to be substantial.
Forget filling the Zep with Hydrogen. Even if you can devise a scheme
to fill an evelope with nothing (vacuum) It is going to be monstrous
in size to displace a hundred kilo's or so.

Count me out on the project...
John W8CCW

On Tue, 11 Jul 2006 23:29:01 +0100, Iain Kelly
wrote:



Whilst the above comments are very well made I must say that there are
some good ideas with this whole HAP thing. A lot of my lecturers and
professors are involved with a big chunk of the research into this
venture, and for high speed broadband data access the idea is good. The
points made about cellular systems are true, but it is my understanding
that in densely populated areas there would be more HAPs up in the air,
each could have multiple cells potentially...

Having said that I do get the impression from some research seminars
I've been to on the subject, that there is still a lot of work to be
done before the proposal can be realised to it's full potential, but I
do think the principle is sound.
John Ferrell W8CCW