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ELECTRIC APIS EA1 is one of the first sailplanes in the world and the first one in my country - Slovenia EU (the first flight was 18. April 2005), which can take off with an electromotor and climb up to altitude 1800m at 50%DOD, even to altitude 3000m at 90%DOD. The altitude depends on the percentage of the discharging of the Li-Poly batteries. The best recomended discharging of the batteries is about 50%DOD. In this case the altitude is app 1800m and the batteries can give 1500 cycles http://kokam.com/english/product/kokam_Lipo_01.html
I did't find any suitable electric motor in the word for direct drive propeller - so I made it by myself. The high powered - BLDC electric motor EMRAX 30 kW continious power is reliable for each altitude. It operates with minimum noise and gives high power and excellent torque at low RPM (direct drive prop) for best climbing up to 6,0 m/s.
In the future solar cells on the wings will give enough nature energy for many take offs next day and to climb much over than 3000 metresof the altitude. AMS flight used to produce APIS sail planes in many versions. I developed an electric propulsion system in my firm called ENSTROJ. In that time (in Y 2004) AMS made kit parts for my Apis e.e.
The firm PIPISTREL is a new owner of APIS gliders project now. http://www.pipistrel.si/planes/721
Apis EA1 has a newely designed canopy, an more efective inner ventialation, it has a retractable wheel with shock-absorber and many new designs for electro power system. The retractable wheel improve L/D = 41:1 and it also visually improves the stream line of the plane.The doors on the body are close when the motor with the propeller is outside or inside the fuselage. The electric system does not produce noise, it is clean, safe, reliable and virtually maintenance free. 
Tehnical data and performance using the NEW tailor-made brushless electric motor named EMRAX 2
The last tests on the new EMRAX 2 air cooled prototype electric motor (Dec 2009) mounted on EA1 - show us the excellent results:
El
motor
-------------------------------------------------- brushless EMRAX 2 (produced by ENSTROJ) Electric motor weight -------------------------------- 11,5 kg Controller DC/AC - Piktronik ---------------------- SAC - 40 (aircooling) Engine
peak power (1min) ------------------------- 50 kW - 68 HP (aircooling 20 m/sec) at 200V DC/2000 RPM Torque continious/peak ----------------------------- 150 Nm/ 250 Nm Engine
speed EA1------------------------------------ 1900 RPM at 200V DC ( direct prop drive) Propeller
diameter EA1------------------------------ 1,7m (new one on EA2 will be 1,8m) Static prop thrust (prop 1,7m)--------------------- 1150 N Batteries Li-poly - power capacity --------------- 8,0KWh Capacity
current -------------------------------------- 40
Ah Voltage DC --------------------------------------------- 200 V
Batteries
weight---------------------------------------- 54
kg Charging
time - depend of DOD ----------------- 4 - 6 hours/230V Take
off distance on grass/ time ---------------- 80 m ( in 8 seconds) Take
off distance on asphalt/ time ------------- 50 m ( in 5 seconds) http://www.youtube.com/watch?v=Y1N0CN2TQUg Max
climb rate ---------------------------------------- 6,0 m/s Max
altitude 50/90% discharging -------------- 1600m
(3000m) Best
glide
----------------------------------------------- 41 : 1 at 95 km/h Empty
weight
----------------------------------------- 240 kg Max
take off mass ----------------------------------- 350 kg Max
horizontal flight distance -------------------- 200
km
options:
Engine
peak power (30 sec) ------------------------ 75 kW - (100 HP) aircooling 20 m/sec at 300V DC/ 3000 RPM (it is possible - not tested yet) EMRAX as Duplex ----------------------------------------- an option (one after another) - the power and torque is doubled
More tehnical data about the EMRAX motors can find on the MOTOR SITE
We are in favour to
make reliable innovations, which are the most important for comfortable in enjoyable flying.
High
efficienty, high-powered, low weight, direct drive electric motors - generators will
run the future machines, EV, boats, planes.
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