- For the construction of the fuselage
: no millings or specific turnings of parts, neither bendings of tubes; only
straight stainless steel tubes, welded under neutral gas (T.I.G.).
Time needed for building the fuselage : approximately 100 hours (no special
competence nor special tools needed).
- For the construction
of the wings : no complicated jigs or flat tables. No dihedral or
sweep angles to worry about. No cables or internal rods, no hinges, no flaps
nor ailerons, no upper struts, no sewing of fabrics, no (or just a few)
handling of dangerous and/or harmful products and materials.
needed for building the wings : approximately 100 hours (no special
competence nor special tools needed).
- For the motorization
used : direct industrial or automobile 4 stroke engine (Honda, 2 CV
Citroen, ½ VW, ...), no mixture of fuel, very few vibrations and noise (the
exhaust muffler is integrated into the fuselage) and very reliable, with low
- For piloting ("driving
!") : only a throttle and steering wheel. No pedals or
taxiing and ground handling : with a low and rearward center of
gravity, a wide and long wheel base, and the fuselage acting as a skid,
associated with effective shock absorbers, large diameter wheels, safe
placement of the placement of the pilot's feet, a powerful front wheel brake,
a rigid seat equipped with "4 points" safety belts, a head-rest, an electric
starter, a propeller well protected from rocks and debris, as well as from
bystanders, an overhead wing to avoid obstacles, a deformable fuselage in
the event of accident, well triangulated to insure the safety of the pilot.
- In flight safety : all the exceptional advantages of
the "Spratt" aerodynamical formula used (no stall nor spin, and the
aerodynamic absorption of gust loads), maximum visibility in all directions
due to the high wing and the pusher engine, good gliding ratio due to a low
drag design, very few vibrations and noise, no icing carburettor in this
engine configuration, great autonomy (6 hours) in spite of the small fuel
quantity (25 liters tank, with directly visible fuel level), small maximum
mass and low landing speed limiting eventual damage.
due to its very short construction time and the low cost
of the specific materials used :
Fuselage : uses
stainless steel tubes of standard size and quality, welded TIG. Other parts,
such as the seat, wheels, fuel tank, baggage container,"Heim" bearing
joints, and other accessories can be found in standard hardware distribution
The cost for fuselage parts is around 500 euros + around
500 € for the professional TIG welder.
wingspars are made out of square aluminium tubes of ordinary dimensions and
standard quality, extruded polystyrene ribs and specificaly designed
composite (fiberglass/polyester) cover.
Price of materials for the 2
wings = 300 euros.
Engine : From 300 euros (2 CV
Citroen) till 2.000 euros for a new Honda engine.
That means a final cost between 2.000 euros (prooved)
and 4.000 euros, depending of the engine choice.
- Moreover, the Spratt 103 is conceived to
resist bad weather and since it can occupy a space of only 4 m X 1 m X 1,20
meters (folding in less than 30 minutes), it will have very low parking
In summary :
Spratt 103 is a revolution
in aviation : Simplifying the prooved but forgotten Spratt concept (two
"free" wings) and with usual modern materials and industrial engine,
designer Bernard Geffray manage to offer clear plans of a very attractive
concept aimed for a really simple, safe and economic aviation.
or spins, gust alleviation, less than 200 hours of easy construction and
final average price of 3.000 € (with 4 stroke engine, stainless steel frame
and specific composite wings) are some of its amazing qualities.
Registred in France under the pendulum and 3 axles categories (choice
depending of the user).
Datas (comply US Part 103, English SSDR and German regulations) :
Span : 8 m Length : 4 m Height : 2 m
Wing area : 10 sqm Wing load : 10 to 15 kg per sqm
Empty weight : 80 to 90 kgs (without the engine* and its accessories and according to options).
Maximum take off weight : 250 kg
* Weight of engines : 15 kgs for “paramotor” 2 strokes till 45 kgs for car or industrial 4 strokes engines.
Power requirements : From 22 hp (mini 75 kgs thrust with propeller d. 125 cm)
Fuel tank : 25 liters
Container/baggage space : 25 liters capacity
+ (with empty weight of 115 kg and engine / 80 kgs thrust) : Minimum speed : 45 km/h (27mph) Maximum cruising : 100 km/h (64 mph)
Climb rate : 3 m/s (600 ft/s)
Take off distance ~ 100 m (330 ft), landing ~ 50 m (165 ft)