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Mark...
Please have a look at the upcoming Alcoa/Phinergy Aluminum-Air range extenders. Coming in 2017.
"The entire battery weighs just 55 pounds (25 kilograms)"
"For every kilogram of Li-ion battery that an OEM replaces with a kilogram of aluminum, that OEM gets 30 times the energy."
"....the battery's aluminum plate anodes are claimed to have an energy density of 8 kWh/kg" [Elsewhere I read 3.5kWh/kg]
"At today’s market rate, a kilo of aluminium costs $2, and one pack of 50 plates weighs 25kg — so, ignoring labor costs, it would cost $50 to refill your Al-air battery. $50 to travel 1,000 miles is really rather good — at $4 per gallon of gas, that’s an equivalent of around 90 mpg."

Comparing this with your eGull...."The most popular battery size for the eGull is 2 2.8 kWh battery's totaling 5.6 kWh weighing 90 lbs", the power density of the extender looks very strong. At the low end of estimates for the extender, 25 times the present lithium ion energy density.

Unfortunately, there is still the annoying wait until at least 2017 or longer. Our fate is to wait.
RMM

Charged EVs | Phinergy CEO on aluminum-air batteries and 1,000-mile range-extended EVs http://chargedevs.com/features/phinergy ... ended-evs/

http://chargedevs.com/features/phinergy ... ended-evs/

Charged EVs | Phinergy CEO on aluminum-air batteries a... http://chargedevs.com/features/phinergy ... ended-evs/ Open Menu Home MAGAZINE Newswire Features Events Contact Subscribe Now Home MAGAZINE Newswire Features Events Contact Phinergy CEO on alum...



View on chargedevs.com http://chargedevs.com/features/phinergy ... ended-evs/
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http://www.extremetech.com/extreme/1518 ... rs-in-2017

Aluminium-air battery can power electric vehicles for 1,... http://www.extremetech.com/extreme/1518 ... rs-in-2017 Phinergy, an Israeli startup, has demonstrated an aluminium-air battery that is capable of powering an electric vehicle for up to 1,000 miles (1,609km)...



View on www.extremetech.com http://www.extremetech.com/extreme/1518 ... rs-in-2017
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Aluminium-air battery can power electric vehicles for 1,000 miles, will come to production cars in 2017 | ExtremeTech http://www.extremetech.com/extreme/1518 ... rs-in-2017

Electric test car with aluminum-air battery takes to the track http://www.gizmag.com/aluminium-air-bat ... -km/32454/



http://www.gizmag.com/aluminium-air-bat ... -km/32454/

Electric test car with aluminum-air battery takes t... http://www.gizmag.com/aluminium-air-bat ... -km/32454/ Last year, Phinergy and Alcoa announced the development of an aluminum-air battery that could give an electric car a potential range of 1,000 miles, with st...



View on www.gizmag.com http://www.gizmag.com/aluminium-air-bat ... -km/32454/
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Gents -

Current best state of the art LiPo batteries are running about 250 WH/KG. That’s just for the bare cells, once you add structure for the battery and battery management systems it’s going to go down. For example, the Zero battery pack comes out to about 148 WH/KG.



I have seen some supercapacitor and ultracapacitor schemes that say they are better than LiPo’s but when you actually get their numbers, some of the best I have seen are around 75 or 100 WH/KG, so definitely less than LiPo. One reason for this is that the LiPo voltage stays at about 3.5V for just about the entire life of its discharge, whereas the capacitor only has rated voltage at the start and then goes down linearly as the charge is removed, reducing the total power you can get out of it.



Nasa Techbriefs showed a company from Idaho that says they are working on a new capacitor that will be 100 to 1000 times better:



http://contest.techbriefs.com/2014/entr ... ation/4729



http://cer-corp.com/content/zephiq-project



Their (hypothetical) pack can run a car 3,000 miles. The numbers they present show 1,000 KWH out of an 175 lb pack, which works out to 2,600 WH/KG, a factor of 10 from today’s LiPo’s. Would be very happy for a factor of 10…



Regards

Bruce

90% of my flying is round robin. So going out with less battery, (fuel), is a shorter trip. There is no doubt in my mind that battery power density will continue to increase, and the length of my round robin gets longer. Some days even now with weather, time, etc, 20 or 30 minutes in the sky with my gas-hog 503 gives me my flying fix, and I can still look down on the flying parachuters and realize that they are probably having as much fun as me.

Kess, what are you averaging for fuel consumption with your 503?

Maybe not so friendly for people and the planet after all:(

A 2012 comprehensive life-cycle analysis in Journal of Industrial Ecology shows that almost half the lifetime carbon-dioxide emissions from an electric car come from the energy used to produce the car, especially the battery. The mining of lithium, for instance, is a less than green activity. By contrast, the manufacture of a gas-powered car accounts for 17% of its lifetime carbon-dioxide emissions. When an electric car rolls off the production line, it has already been responsible for 30,000 pounds of carbon-dioxide emission. The amount for making a conventional car: 14,000 pounds.
While electric-car owners may cruise around feeling virtuous, they still recharge using electricity overwhelmingly produced with fossil fuels. Thus, the life-cycle analysis shows that for every mile driven, the average electric car indirectly emits about six ounces of carbon-dioxide. This is still a lot better than a similar-size conventional car, which emits about 12 ounces per mile. But remember, the production of the electric car has already resulted in sizeable emissions—the equivalent of 80,000 miles of travel in the vehicle.
So unless the electric car is driven a lot, it will never get ahead environmentally. And that turns out to be a challenge. Consider the Nissan Leaf. It has only a 73-mile range per charge. Drivers attempting long road trips, as in one BBC test drive, have reported that recharging takes so long that the average speed is close to six miles per hour—a bit faster than your average jogger.
To make matters worse, the batteries in electric cars fade with time, just as they do in a cellphone. Nissan estimates that after five years, the less effective batteries in a typical Leaf bring the range down to 55 miles. As the MIT Technology Review cautioned last year: "Don't Drive Your Nissan Leaf Too Much."

Wow!

Sent from my iPhone

Hi
It will take some time to verify these claims. But I saw the top gear gear episode your referring to and it is totally bogus. The petrochemical industry has a really large budget and spends a lot of time and money spreading partial truths to cause confusion and distract us from learning about better ways to protect ourselves from there profit above all else.
Happy Flying
Mark

Sent from my iPhone

Mark..
Which piece of information earned this "Wow!". There are two recent posts just preceding yours. Your reactions carry a lot of weight. Please let us all know what got this response? Thanks
RMM


---In Earthstar_Aircraft@yahoogroups.com, <thundergul@...> wrote :

Wow!

Sent from my iPhone

On the aluminum battery subject, if you read some of the info, half of the reaction is heat and half is electricity. Given that this is true, would need a pretty substantial cooling system for the battery. Not so bad on a car, but not so great on an airplane. But at 3.5 kWh/Kg (a factor of about 14 over today’s LiPo’s), you have some wiggle room to work with as far as adding fans, radiators, and heat sinks as required. Great for you winter flyers up north…



LiPo’s today are 20C to 50C rated, and when operated at 1C (ie 1 hour discharge) or 2C (ie 30 minute discharge) like you would in an airplane don’t really even get warm.

Mark, I’m right with you in the dis-information that we see are tv claiming to be the truth, from petro-chemicals to the Islamic mess. We have to consider all the info we can find from as many independent sources, as a lot of the studies are done by the same people doing the dis-information. More coffee please.