Silent 2 Electro

The SILENT 2 Electro is self-launching sailplane incorporating the Front Electric Self-Launcher/Sustainer (FES). The aircraft is capable of both unassisted take-off and periods of powered flight – as may be necessary to sustain soaring flight.

SILENT 2 Electro is the only self-launching sailplane incorporating the Front Electric Self-Launcher/Sustainer (FES) in serial production. The aircraft is capable of both unassisted take-off and periods of powered flight – as may be necessary to sustain soaring flight. The highly efficient 22kW brushless electric motor installed in the nose is powered from two purpose built rechargeable Lithium battery packs and drives a folding propeller. The power chain is aerodynamically clean and operationally very simple compared to a retractable power plant. It is also effectively maintenance free.

A typical self-launch will require a ground run of about 100m on a hard runway (~120m on grass) and can be expected to consume about 20% of the available battery capacity, leaving about 40 minutes of power available for use as a sustainer. There is no forward pitch moment on take-off and the motor delivers the same performance regardless of altitude.
Two purpose built Lithium battery packs, with built-in Battery Management System and a combined capacity of 4.4kWh are located behind the cockpit; very close the centre of gravity. Weighing just over 15kg each they are easily removed for charging.

Designed for the new FAI 13.5m class, every component of the glider is built to the very highest standard and everything is incredibly light!  All control linkages are automatic; rigging could not be easier!With a maximum take-off weight (MTOW) of 300kg (or 313,5 kg if equipped with the optional ballistic recovery system) and a stall speed of less than 65 kph (35 kts) the aircraft is de-regulated in terms of air worthiness in most countries.
The glider is trimmed in pitch via an innovative variable-position horizontal stabiliser. The incidence of the horizontal stabiliser is governed by the flaperon setting; the five settings of the flap control produce corresponding changes in the incidence of the stabiliser, thus defining the trim airspeed in relation to the flap setting while the conventional elevator minimizes trim drag.

Wingspan. 13.5 m, 44.55 ft
Wing area.  9 m², 95.8 ft²
Aspect Ratio.  20:1
Fuselage length. 6.34 m, 21 ft
Empty weight (Typ) 200 kg, 441 lb
Maximum pay load (Typ) 100 kg, 220 lb
Wing load factors +5.3g/-2.65g (at 150kph and 315kg)

Maximum wing loading 35 kg/m2 (at 315 kg)
Best glide (VbL/D) 1:40 at 90kph, 1:40 at 48 kn
Minimum sink (VbMS) 0.6 m/s at 85kph, 1.12 kn at 46 kn
Stall speed (VS) < 65kph, <35 kn
Manoeuvring speed (VA) 150 kph, 81 kn
Maximum speed (VNE) 220 kph, 119 kn
Motor power 22 kW
Propeller diameter 1 mt
Propeller speed (max) 4,500 rpm
Battery capacity (max) 4.3 kWh
Rate of climb (max power) >2 m/s, >4 kn