# Re: [MBZ] Add: Airbus Electric Plane

Like I said, "Physics'll work EVERY time." It's gotcha right by the "ying-yang," and not lightly - it's always squeezin'.
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Wilton```
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----- Original Message ----- From: "Meade Dillon via Mercedes" <mercedes@okiebenz.com>
```To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Wednesday, June 17, 2015 2:15 PM
Subject: Re: [MBZ] Add: Airbus Electric Plane

```
```I'm going to answer my own question, as I think Andrew either won't or
can't.

The subject plane's wingspan is 9.5 meters, let's say we'll be able to fit
12 square meters of PV cells.

When it is summer and the sun is shining, and it is shining directly down
(local apparent noon), about 1000 watts per square meter reach the earth.

So the maximum amount of power available for the PV cells to absorb is
12,000 watts, under exactly the right conditions.

```
The subject plane has two engines, 30,000 watts each, so it requires 60,000
```watts to fly.  100% efficient PV cells won't do it.  What is the current
state of the art, 35% efficient?

Solar won't get you there, unless you can violate the laws of physics.

-------------
Max
Charleston SC

```
On Wed, Jun 17, 2015 at 1:54 PM, Meade Dillon <dillonm...@gmail.com> wrote:
```
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```Please tell us the amount of power (kilowatts) in a square meter of
```
sunlight at sea level. Now compare that to the amount of power required to
```fly an airplane, and the square meters of wing surface on the upper wings
of the subject airplane.  A little simple math, fill in some reasonable
estimates for missing information, and I think you will begin to see that
even if solar panels reach 100% efficiency, they still won't work...

-------------
Max
Charleston SC

On Wed, Jun 17, 2015 at 1:49 PM, Andrew Strasfogel via Mercedes <
mercedes@okiebenz.com> wrote:

```
I beg to differ. Solar panel efficiencies are climbing relentlessly while
```the manufacturing cost continues to decline.

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