... This phase being the most critical, the main constraint is the one

imposed by the batteries. Still heavy, they require a drastic reduction of

the weight of the rest of the plane, so as to optimize the whole energy

chain and to maximize the aerodynamic performance provided by using a high

aspect ratio wing with a low-speed profile. With an energy density of

240Wh/kg, the lithium polymer accumulators weigh 400kg, or more than ¼ of

the total mass of the plane.

Batteries it does have.

Michael Oke, II

okeind@gmail.com

On Tue, Jun 5, 2012 at 10:51 AM, Pete Theisen <petetheisen@verizon.net>wrote:

> On 06/05/2012 01:33 PM, Alan Bourke wrote:

> > If the sun goes in do they have to lean out and shine torches on the

> > wings?

>

> Hi Alan,

>

> They took off in the dark. They must have some batteries. The guy sleeps

> part of the time, must have some sort of autopilot, too.

> --

> Regards,

>

> Pete

> http://pete-theisen.com/

> http://elect-pete-theisen.com/

>

[excessive quoting removed by server]

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