What do you think about "e-soaring"?

[John.Roo]

Tandem wing does away with down force of horizontal tail. Bi-wing does not. Nenadovic' bi-wing creates deep laminar flow over forward wing for better overall efficiency, tit for tat or?

It was just a sample that in UAV world are already solar powered projects common
Each producer has a different approach.... But why not? If is prototype "small and light" is easier to get permission to fly (no pilot aboard). For bigger versions is probably more paperwork required, however in US are large areas where can be UAV tests without danger to damage some houses. In EU is actually more complicated - even RC model require registration....

Point is.... we can see many UAV types so there is also possibility that someone will use Nenadovic design

 

[John.Roo]

=NO ! only KASPERwing shape,transparent central part...+ low drag fuselage...

=NO parasitic surfaces drag (tail system!)

I wonder if there is any application where Kasper wing could not be used

 

[John.Roo]

During the past week, two electric cars in CR caught fire while charging... Both at home = no high charging power

I was fan batteries in the wings. It means lower load of fuselage. But seems that priority should be possibility of easy manipulation and simple battery removal.
I still believe that even homebuild e-instalation can be safe, however 6 kWh = 2x 15 kg and that is not so bad for manipulation

 

[henryk]

there is any application where Kasper wing could not be used

="thanks" ! You are right...

f.e. quick removable in wings batterys ("soft packets") ?

=A-22 GRS system like !

 

[John.Roo]

Project Solar Stratos seems to go forward

Solarstratos - SolarStratos

Are you ready to flirt with the edge of space?

www.solarstratos.com

One detail.... seems that tey don´t use aibrakes.
Is possible that they use prop and "e-motor brake"?

 

[John.Roo]

e-Genius hybrid flown 2 003 km...
"Klaus Ohlmann and Jonas Lay in the one-and-only eGenius just completed a 2,003 kilometer (1,244 mile) trip from Germany to the Atlantic Ocean on the southern tip of France and return. The numbers are spectacular. The flight averaged 190.36 kilometers per hour (118.28 mph) and its hybrid power system consumed a mere 81 liters of fuel. That works out to 24.72 kilometers per liter or 58.15 mpg."

Klaus Ohlmann, Jonas Lay and eGenius go 2003 kilometers › Sustainable Skies

Klaus Ohlmann and Jonas Lay in the one-and-only eGenius just completed a 2,003 kilometer (1,244 mile) trip from Germany to the Atlantic Ocean on the southern tip of France and return. The numbers are spectacular. The flight averaged 190.36 kilometers per hour (118.28 mph) and its hybrid power...

sustainableskies.org

 

[henryk]

e-Genius hybrid

=on fuselage top=cooling air inlet ?

(power of IC engine ?)

BTW= 1866, not hybrid, ONLY 3-4 km distances...

 

[Sraight'nlevel]

=on fuselage top=cooling air inlet ?

(power of IC engine ?)

BTW= 1866, not hybrid, ONLY 3-4 km distances...

No thermals ?

 

[John.Roo]

e-Genius, Sunseeker Duo.... very nice projects with great performance. Each have his own approach to low emission sport flying, but both are looking great.

Question is - is market interested in such a planes? For serial production and standard use would be probably necessary to make small improvements, but finally we could have planes able to fly long distance with low (zero) emissions. So why we don´t see any signs that serial production of such a planes will be started? Both prototypes are showing ability to fly and they both obtained registration and permission to fly.
Is reason too high price? Complexity?
Seems a bit strange to me.....

 

[henryk]

No thermals ?

=yes !

-after allmost vertical start from 40 m (NO "taxii , autostabil "S"-shape airfoil) ! Jan gained speed and then Hi was fly
at very low altitude, circa 1 m , (ground effect ,gained L/D )=so long distance as hill was.

 

[John.Roo]

e-Genius at the NASA/CAFE GFC 2011 - elegant airplane


By the way... nice feathering prop

 

[blane.c]

Maybe production is supposed to happen elsewhere? The solar panels may have been produced in a quantity for a “stunt” but otherwise unavailable?

 

[Sraight'nlevel]

=yes !

-after allmost vertical start from 40 m (NO "taxii , autostabil "S"-shape airfoil) ! Jan gained speed and then Hi was fly
at very low altitude, circa 1 m , (ground effect ,gained L/D )=so long distance as hill was.

Has anyone been able to dublicate Jan's accomplishment with similar apparatus ?

 

[henryk]

Has anyone been able to dublicate Jan's accomplishment with similar apparatus ?

-yes,I try, at first with "today" technology (8 kg !),
after fly tests=from halve 19 Century materials (wood,linen sail, skeen riemens...)

 

[henryk]

nice feathering prop

=influence of feathering propeller onto unsimmetrical reaction momentum ?

 

[John.Roo]

Maybe production is supposed to happen elsewhere? The solar panels may have been produced in a quantity for a “stunt” but otherwise unavailable?

That is possible.... maybe they used special solar panels... that would explain why is not "serial" produced Sunseeker Duo.
However hybrid like e-Genius is not using any special technology.

I hope that at least Elfin will make soon first flight....

 

[John.Roo]

=on fuselage top=cooling air inlet ?

(power of IC engine ?)

BTW= 1866, not hybrid, ONLY 3-4 km distances...

Well.... every country has some legends.
It they are true or not is difficult to say.
I personally believe that in this case is really possible that pilot did some succesfull "jumps" or "short flights". Jan Wnek did his tests during practically same years like Otto Lilienthal.
I can imagine that with good weather condidions (and very optimistic point of view) he could make flights between 30 m to 400 m.
But 3-4 km?

 

[henryk]

But 3-4 km?

=with greate probability...(on ground effeckt/ecran augmented L/D )

Ground Effect | SKYbrary Aviation Safety

Definition Ground Effect is the name given to the positive influence on the lifting characteristics of the horizontal surfaces of an aircraft wing when it is close to the ground. This effect is a consequence of the distortion of the airflow below such surfaces attributable to the proximity of...

skybrary.aero

Na takich skrzydłach latał pierwszy na świecie lotnik. Był Polakiem

Zapewne niewiele osób wie, że w krakowskim Muzeum Etnograficznym oglądać model skrzydeł na jakich najprawdopodobniej wzbił się w powietrze pierwszy człowiek na świecie, zapomniany, polski prekursor lotnictwa.

lifeinkrakow.pl

=1866-69 ! (in 69, after hard landing was dead...)

=2022 =was finde His body,with brokan two arms !

https://rdn.pl/news/duze-prawdopodobienstwo-ze-odkryty-niedawno-grob-odporyszowie-miejsce-pochowku-znanego-wynalazcy-zdjecia

 

[John.Roo]

=with greate probability...(on ground effeckt/ecran augmented L/D )

Ground Effect | SKYbrary Aviation Safety

Definition Ground Effect is the name given to the positive influence on the lifting characteristics of the horizontal surfaces of an aircraft wing when it is close to the ground. This effect is a consequence of the distortion of the airflow below such surfaces attributable to the proximity of...

skybrary.aero

Na takich skrzydłach latał pierwszy na świecie lotnik. Był Polakiem

Zapewne niewiele osób wie, że w krakowskim Muzeum Etnograficznym oglądać model skrzydeł na jakich najprawdopodobniej wzbił się w powietrze pierwszy człowiek na świecie, zapomniany, polski prekursor lotnictwa.

lifeinkrakow.pl

=1866-69 ! (in 69, after hard landing was dead...)

=2022 =was finde His body,with brokan two arms !

https://rdn.pl/news/duze-prawdopodobienstwo-ze-odkryty-niedawno-grob-odporyszowie-miejsce-pochowku-znanego-wynalazcy-zdjecia

Henryk you know perfectly what means to fly 3-4 km in "ground efect" - you flown personally many times with hang glider
I can only repeat that in year 1866 even 30 meters flight would be great success.

Article says that he was "jumping from bell tower" and during his last flight he crashed in distance between 500 - 1 300 m from tower.
If he was "jumping from bell tower" than is difficult to imagine how he was using ground effect.
Tower height is not mentionned - you wrote 40 m.
3-4 km distance from 40 m altitude?
I really can´t imagine help of ground effect on that distance.
And if he really used ground effect, than fall from 1 m would be not catastrophic.

Legends are..... legends.
Nice to imagine, but is better not think about legends too techically
In any case was Jan Wnek really interesting person

 

[John.Roo]

When e-Genius has been "only" battery powered, they did also nice flights


Interesting info at the end of video....
First flight - 325 km distance and 40 kWh of energy has been used.
Flight back - 365 km distance and 43 kWh of energy used.
During both flights they flown at 4 000 m altitude (13 000 ft).

And e-Genus ILA 2012 presentation....