What do you think about "e-soaring"?

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henryk

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krakow,poland
ZERO motor.

-not revelation...

compare with=EMRAX motors=

 

EzyBuildWing

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Sep 23, 2009
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319
Location
Sydney NSW Australia
e-Strojenik Zero 50 HP MotorGlider.
This aircraft-conversion was featured in Kitplanes recently....
Specs might be of interest:
We have an experimental electricly converted Strojnik S-2A for sale, fitted with a Zero motorcycle 50 hp motor, and we are now completing flight tests in this motor glider. The battery charge lasts about 1 HOUR, if the aircraft is flown conservatively. The aircraft can be flown to 3000 ft AGL and then soared in lift with enough charge left to sustain for 20-30 minutes. The aircraft needs some polishing and painting, but it is in good condition and ready to fly. After the passing of two owners, and with other owners downsizing their flying, we have decided to sell this unique aircraft. However, at least one owner/builder (the test pilot), continues to enjoy flying the electric S-2, and will happily tell you about the aircraft. He has now flown the S-2 five times since July this year, including a 30 mile (out and back) ridge flight. Contact him at his e-mail: [email protected]

 

John.Roo

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Oct 8, 2013
Messages
915
Location
Letohrad / Czech Republic
e-Strojenik Zero 50 HP MotorGlider.
This aircraft-conversion was featured in Kitplanes recently....
Specs might be of interest:
We have an experimental electricly converted Strojnik S-2A for sale, fitted with a Zero motorcycle 50 hp motor, and we are now completing flight tests in this motor glider. The battery charge lasts about 1 HOUR, if the aircraft is flown conservatively. The aircraft can be flown to 3000 ft AGL and then soared in lift with enough charge left to sustain for 20-30 minutes. The aircraft needs some polishing and painting, but it is in good condition and ready to fly. After the passing of two owners, and with other owners downsizing their flying, we have decided to sell this unique aircraft. However, at least one owner/builder (the test pilot), continues to enjoy flying the electric S-2, and will happily tell you about the aircraft. He has now flown the S-2 five times since July this year, including a 30 mile (out and back) ridge flight. Contact him at his e-mail: [email protected]

Thxs for info - interesting :)
 

John.Roo

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Oct 8, 2013
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915
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Letohrad / Czech Republic
Full Kitplanes Article on Strojenik S-2 e-conversion to 50HP ZERO motorcycle-power, here: Thanks Kitplanes, great article!

That makes sense to me :)
E-flying should start with simple one seat "motorgliders" with low power requirements. And step by step we can move to bigger airplanes.
"Motoglider" like design has advantage of passive safety (good L/D give you enough time for landing in case of propulsion failure) and as mentionned - advantage is also low power requirement.
 

EzyBuildWing

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Sep 23, 2009
Messages
319
Location
Sydney NSW Australia
Strojenik S-2 motorglider was described in EAA Sport Aviation April 1982, March 1983 and also January 1990 editions.....well worth reading.
Measured power for the S-2 motorglider in economy-cruise straight and level was 4 to 5 HP.....
Add 8 HP for climb ( which calculates to ROC500 ft/min).
So a 20 HP motor could be installed, to save a bit of weight.
But then you have to add the batteries, which at present have a pretty low energy-density.
(I notice Honda makes a 4-stroke OHV 'kart engine.... about 200cc for about 20 HP)
 

John.Roo

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Oct 8, 2013
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915
Location
Letohrad / Czech Republic
Neat eTwin-engine motorglider here:

This is nice idea :)
In Czech Republic is "electric twin" possible, we only have to show that in case that one engine will stop the other will stop as well. In other words - system must work like single engine.
First "electric twin" based on UL glider will fly in Czech Republic under OK registration in few months.
However it is a question if all coutries in EU will accept that design of electric propulsion system for UL planes.
 

John.Roo

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Location
Letohrad / Czech Republic
=we have got A123 (15 Wh elements) =2.7 kWh , circa 20 kg...
=for Bogdans Motor-glider, with 154120 (80 KV) BLDC +CR Diff. reductor
with 1.3 m propellers=View attachment 106284
Looks like you go really forward - good job :)

Just... be carefully with cells.
You use metal "cable tie" and cells are touching each other.
If you are not strictly limited by place I would definitelly recommend you to make installation with more space between cells.
 

henryk

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Mar 8, 2010
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6,186
Location
krakow,poland
Looks like you go really forward - good job :)

Just... be carefully with cells.
You use metal "cable tie" and cells are touching each other.
If you are not strictly limited by place I would definitelly recommend you to make installation with more space between cells.
=this instalation was for 15 Ah A123 cells testing only...we by them circa 400 EUR,
for reinstalation (in place of 40 l tank).

=60 V, 45 Ah.

=we have FREERCHOBBY 500 A /120 V controllers,
and 154120 motor (1000 $ with shipping ) is in DHL hands...

=variant for RETAIRED & HOMELESS...

=complite fuselage with E-Drive is 55 kg weight.
 

henryk

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Mar 8, 2010
Messages
6,186
Location
krakow,poland

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