On Thu, Jul 10, 2014 at 3:28 AM, Russell Standish <[email protected]> wrote:
> IIRC, the average insolation is something like 1kW/m^2, so that would > make John's solar cells around 3% efficient At noon under ideal conditions a square meter of solar cells can produce about 150 watts, but midnight is not ideal conditions and I was averaging over 24 hours. 30 watts sounds about right to me. If you rigged the solar panels to follow the sun you could do a bit better but it would be dramatically more expensive. I assume that the quoted 333MW engines for a 767 was actually the maximum > power, which is only required for take off, No. The number I started with was 140 megawatts, and that's the AVERAGE amount of power a 747 uses during a flight, during take off it would be considerably more than that. But after I sent my post I did realized I made a mistake, I was assuming that the jet engines on the 747 were 100% efficient which is nonsense, 50% would be more like it. So the factory needed to provide the fuel to keep just one 747 in the air would cover closer to 6 square miles of the Earth’s surface than 3 as I originally said. And that my friends just isn't practical. John K Clark -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
