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What do you think about "e-soaring"?

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John.Roo

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Well.... I did already succesfull glider aerotowing with electric Phoenix...
e-aerotow.jpg
e-aerotow on sky.jpg
e-aerotow on blue sky.jpg
... but on the video is aerotowing with Phoenix with 100 hp Rotax :)
It was one of my first aerotows with Phoenix. In glider was experienced pilot and very good glider designer Christian Brondel from company Stralpes.
 

John.Roo

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"Rolls Royce" between motorgliders...
However I really don´t like the idea of 120 kg (264 lb) bateries behind pilots.
But what I like is the range extender - 60 kg / 30-35 kW sounds good.

And this is also interesting:
"The elfin design ist a complete new development and does not base upon the existing S10. REINERSTEMME.aero GmbH, the present company of Dr. Reiner Stemme, is not connected to STEMME AG."
Not based on Stemme S10? Really?
 
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blane.c

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capital district NY
"Rolls Royce" between motorgliders...
However I really don´t like the idea of 120 kg (264 lb) bateries behind pilots.
But what I like is the range extender - 60 kg / 30-35 kW sounds good.

And this is also interesting:
"The elfin design ist a complete new development and does not base upon the existing S10. REINERSTEMME.aero GmbH, the present company of Dr. Reiner Stemme, is not connected to STEMME AG."
Not based on Stemme S10? Really?
That statement does seem a stretch.

I think it should perform well normal, when something "poops the bed" I am more curious.
 

John.Roo

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I hope they will release more details about the Elfin range extender.

"The 60 kilogram (132 pound) under-wing mounted internal combustion engine and generator setup can deliver 30-35 kW continuously."
stemme_rangeextender_vorab2_9ce8548228-1.jpg
 

John.Roo

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Letohrad / Czech Republic
So they may sell more of these than gliders?

It must be complete with fuel tank?
According to infro from web is in pod only range extender and fuel tank is integrated in the wing.

Looks great, just the price....
"New Stemme S12 has U.S. price from $349,000 to $369,000."
.
And that is price for Rotax Stemme... so lets wait how much will costs electric Elfin version and how much will costs the range extender.
 

EzyBuildWing

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Sep 23, 2009
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Sydney NSW Australia
Dragonfly Rancher crop-sprayer can carry 42 gallons (420 lbs) of liquid-spray. So presumably 420 lbs of batteries could replace the liquid-spray for an hour or so of inexpensive e-Flying. Check out the vid:
 

John.Roo

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Messages
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Location
Letohrad / Czech Republic
Dragonfly Rancher crop-sprayer can carry 42 gallons (420 lbs) of liquid-spray. So presumably 420 lbs of batteries could replace the liquid-spray for an hour or so of inexpensive e-Flying. Check out the vid:
Generally you really can use weight reserve for a big battery :)
I suppose that 420 lg is weight of liquid. You will use electric motor and electric motor is lighter than ICE - another weight reserve. And there is also some reserve for fuel.

But too heavy battery is also not good so you have to decide:
- how much power you need for takeoff
- how much power you need for hoorizontal flight at requested cruise speed (ideally at best L/D speed)
- typical flight profile (how long do you want do fly, how many takeoffs etc.).
- do you wan to fly alone or with co-pilot
- and probably most important question... how much money you want to spent :)

And from all that informations you get basic specification of electric propulsion system you need :)
 

John.Roo

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Messages
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Location
Letohrad / Czech Republic
E-Spyder
"Flightstar e-Spyder
Electric aircraft development of the Spyder in conjunction with Yuneec International of China. Equipped with a Yuneec Power Drive 20 20 kW (27 hp) electric motor and two 28 lb (13 kg) lithium-polymer battery packs which provide a 40 minute endurance. First flown in July 2009. Qualifies as a US single seat ultralight with an empty weight of 253 lb (115 kg)."
 
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