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Posted by Neo on August 31, 2009, 10:16 pm
 



I've also heard that carbon fiber is difficult to use and to
manufacture.
However, both the Smartcar and the Aptera use a carbon fiber shell
body.
IIRC the Axon used plastic skin over a carbon fiber frame.
The Axon carbon fiber frame is constructed using a *braided carbon
fiber" like rope material..


Posted by harry on September 1, 2009, 6:34 pm
 



quoted text -

Carbon fibre structures are no  harder to construct than glass fibre.
But labour intensive. Can you afford an Aptera?

Posted by Neo on September 1, 2009, 11:26 pm
 


The all electric 2010 Aptera Type 2e cost from $5000 to $0000.
There is no discount and the Aptera is only available in California
for the time being.

Both versions of the Aptera are two seaters so the
  and the 2e won't be out until 2009 October (for those who live in
California).
The Aptera has a drag coefficient of .15  (compared the 2010 Prius is .
25) and only weighs about 1500 pounds.

The Aptera 2e has 10 -13kwh LiIon Batteries which are wired to output
336VDC
The Aptera 2e recharger needs 5 hours using 220 VAC @70 Amp circuit to
do a full recharge.
The Aptera 2e has a range of 100 miles per recharge
Reportedly the  Aptera 2e energy effiicency is 1 miles/96wh [1]
                                                               or  100
mile/9600wh = 100 miles/ 9kwh

If electricity cost 16 cents  per kilowatt hour then
The estimated cost of operating the Aptera 2e would be  100 miles/
$.53.





[1] the energy efficiency was reported in
     http://en.wikipedia.org/wiki/Aptera_2_Series
    however, chatter on the aptera forum about the recharger power
requirements
    suggest the *reported* energy efficiency may be overly optimistic.




Posted by Neo on September 2, 2009, 10:00 am
 


my bad.  I should have rounded up to 100 miles/10kwh ...


correction ( or one step closer to the reality)
I based the above electrical cost estimate from my own electricity
bill in the Washington DC area.
But I was in a rush and I could have been more precise... to be more
precise ...
my actual generation cost is about 11.7 cents/kwh but after all the
surcharges and taxes its more like 16.9 cents/kwh
(I am purchasing electricity generated by a wind power consortium call
Clean Currents via PEPCO)

So if  it only  takes 9.6Kwh to recharge the Aptera then my revised
estimate would be

  9.6kwh * 16.9 cents/kwh =  163 cents = 1.63 US dollars.

currently in the Washington DC area,
one gallon of regular gasoline(87octane)  cost about 2.60 US dollars



The actual load on a battery recharger is normally not uniform
and the max circuitry load required by the battery recharger
is for the max current/power drain during a recharging cycle
which will vary over time.  I wish I had a Aptera, a Leaf, and a Volt
to test.   I could put a kill-o-watt meter between the wall outlet
and battery recharger and monitor the power drain from a
full recharge cycle... sigh.


Posted by danny burstein on September 2, 2009, 11:01 am
 



Alas, the KAWs only work for the more common (in the US) 120 volt
circuits. Bad Things [tm] may happen if you try them on the
higher voltage.


--
_____________________________________________________
Knowledge may be power, but communications is the key
             dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]

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