Fournier RF5b Short Kit

Fournier RF5b Short Kit


Made to order

Fournier RF-5B “Sperber” Short Kit by Chris Williams

Chris Williams is probably one of the most proliferate rc model sailplane designers around and has been for many years. Chris Williams has rescaled and modelled this tandem cabrio motor-glider to 1:4 scale on three very large, well detailed CAD-drawn plan sheets for 5-function R/C and a BL4030 outrunner. With a model weight of just 7.7 kg it is a delight to fly.

A 1:4 scale 4.3m electric glider adds to Chris Williams growing collection of powered touring gliders.

Watch the video of the Fournier RF5b motor glider

WING SPAN: 4.3m / 169.5″
WEIGHT: 17 lb. / 7.7 kg
SCALE: 1:4

Plan and canopy are available from Sarik Hobbies

Made to order

SKU: LCS-CW-RF5b-short-kit Category:


Fournier RF-5

The Fournier RF-5 is a two-seat motor glider designed by René Fournier.

The RF-5 is based on the single seater Fournier RF-4, and is a low-winged monoplane of all-wooden construction, with the crew of two sat in a tandem enclosed cockpit. It is semi-aerobatic with loops, stall turns, lazy eights, chandelles and spins approved. It has a manually rectractable center landing gear, a steerable tailwheel and detachable outrigger landing gear. Spoilers are available to reduce lift. The wingtips of the parked aircraft can be unlocked and folded inwards by a single person to reduce required hangar space.

Fournier Variants

An improved high-performance version. Powered by a 50.7 kW (68 hp) Limbach SL 1700 E Comet engine.[5]
RF-5B Sperber
A high performance powered sailplane with 17.5 m (57 ft) span wings.
AeroJaén RF5-AJ1 Serrania
License built version produced by Aeronaútica del Jaén SA

Specifications (RF-5)

General characteristics
Crew: 2
Length: 7.8 m (25 ft 7 in)
Wingspan: 13.74 m (45 ft 1 in)
Width: 8.6 m (28 ft 3 in) wings folded
Height: 1.96 m (6 ft 5 in)
Wing area: 15.12 m2 (162.8 sq ft)
Aspect ratio: 12.5
Airfoil: root:NACA 23015, tip:NACA 23012
Empty weight: 420 kg (926 lb)
Max takeoff weight: 650 kg (1,433 lb)
Fuel capacity: 60 l (15.9 US gal; 13.2 imp gal)
Powerplant: 1 × Limbach L2000 EOI 4-cyl. horizontally-opposed air-cooled piston engine, 60 kW (80 hp)
Propellers: 2-bladed Hoffman HO-V-62-R/160 fixed pitch propeller

Cruise speed: 209 km/h; 130 mph (113 kn)
Stall speed: 80 km/h; 49 mph (43 kn) clean
Never exceed speed: 250 km/h; 155 mph (135 kn) at max t/o weight
Range: 700 km (435 mi; 378 nmi) to 900 km (490 nmi; 560 mi)
Service ceiling: 5,000 m (16,000 ft)
g limits: +6 -3
Maximum glide ratio: 20
Rate of climb: 3.29 m/s (648 ft/min) max
Rate of sink: 1.4 m/s (280 ft/min) power off
Wing loading: 42.99 kg/m2 (8.81 lb/sq ft) at max t/o weight


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