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"Ile de France"©®
is the name of this tail-first "canard" aerodyne (the
main wing and propulsion unit are at the rear of the plane)
based on a new concept with a double pentagonal fairing and
twin-engine or twin turboprop configuration.
1996, saw the starting point for this adventure with the construction
of a static model with a 2.28 m wingspan.
Between 1997 and 2000, a number of other flying models of the
same size were flight tested.
It is planned to build two- and four-seater ULMs, business aircraft
for up to 8 or 10 passengers, and a UAV. Wingspan of the UAV
will be adaptable according to equipment and mission (surveillance
of forests, drilling rig platforms, frontiers, towns, etc.).
It will be of furtive design and undetectable above an altitude
of 5,000 m, and possessing high flight endurance and payload
Equipped with very low mass, high-performance engines running
on kerosene and mounted on the inner third of the wing, with
constant speed drive (CSD) contra-rotating pusher propellers
placed in a forward inlet recess in the double pentagonal fairing.
The aerodynamic efficiency of this innovative system increases
lift (CL) and thrust, inducing a significant reduction in drag
(CD) and excellent flight performance at low speeds and high
Drift and crosswind: crosswind effect on the lateral
stabilisers and is best compensated by propeller blast at the
inlet and outlet of the pentagons, and becomes very low due
to the wing surface of the high lateral plane (1.32 m²),
inclined at an angle of 50°, and the initial force of the
crosswind drops to 44%. This force also drops to an insignificant
level on the lower horizontal lateral plane and on the shell
Example: a 20-knot crosswind has the same force as that for
a maximum wind speed of 10 knots!
Equipment: this aircraft will be equipped with a BRS
(ballistic recovery system). This ballistic pyrotechnic survival
system deploys a parachute in a dangerous emergency situation.
Line of flight: due to its light weight, power, low total
drag, form and wing surface, and the absence of a critical engine,
this aircraft should ensure a satisfactory line of flight in
the event of failure of one of its two engines.
Initial commercial approach to the dimensions and performance
of the four-seater version:
theoretical speeds: CL/CD max: 123 Kts
|Wingspan: 12.72 m
Length: 8.6 m
Max. height on ground: 2.14 m
Aspect ratio: 8.6
Hook angle: 11°
|Track: 4.20 m
Wheelbase: 3.84 m
Wing taper: 0.41
Retractable tricycle undercarriage
Wing surface : 18.7 m²
|Wing load: 736.36 N/m²
Propulsive power: 2/3 of 5.4 kg/ch
Laden weight: 800 kg
Cockpit inside width: 1.15 m
Cabin length: 2m/ with luggage: 2.5 m
Vso: 45 Kts, Vsi: 55 Kts, Vno: 210 Kts, Vfe, Vne and Va and
others speeds (established at time of build).
Aircraft version performance (400 kg dry)
|Take-off distance: 200 m
Min. landing speed without flaps: 61.5 kts
|Landing distance: 150 m
Min. landing speed with flaps at 40°: 50 kts
- With 4 passengers (4 x 70 kg) = 280 + 50 kg luggage + 72 kg
fuel (100 litres) = 402 kg
- With 2 passengers (2 x 70 kg) = 140 + 100 kg luggage + 162
kg fuel (225 litres) = 402 kg
Hydrogen UAV aircraft version performance (400 kg dry)
Wingspan and AOA can be increased from the wing.
- Propeller aircraft/UAV version, autonomy 18 h: 150 kg equipment
+ 345 kg kerosene (480 litres) = 495 kg
- Hydrogen aircraft/UAV version, min. autonomy 15 days: equipment
+ fuel = 495 kg
The silent aircraft is a long-standing dream of all manufacturers.
The commercial success of an aircraft depends inevitably on
the noise which it generates, for jumbo-jets in the vicinity
of airports, and drones in terms of discretion.
For a propeller-driven aircraft, it is not the engine which
produces the most noise but the propellers themselves, rotating
at close to the speed of sound (ratio of travel time at the
blade tip for one rotation).
If our UAV is equipped with thermal engines and three-blade
propellers the noise level is reduced by half. However, a hydrogen-powered
UAV, identical propellers driven by electric motors will make
the UAV practically undetectable even at low altitudes.
Economy, speed and range
Each engine should consume 15 litres of kerosene per hour, or
max. 30 litters for two engines.
The cost with aircraft flying at 65% power at 135 kts (approx.
250 km/h) would be about 20 litres per hour, or
€ 9 for 250 km or € 3.6 per 100 km. On this basis,
a flight from Boston to Washington would come out at about €
22 for four passengers, or € 5.5 per passenger.
This makes the trip much cheaper than by car, not counting toll
charges, with no fatigue element and three times faster.
With full tanks (240 litres), the aircraft would have a range
of 2,750 km (11 hours' flying time + 1 hour margin).
The potential range of high and low-speed flight is very wide.
The outer wings are retractable, and can be dimensioned differently
to meet customer requirements. All flight domains can be addressed
with this concept.
The aircraft can also be equipped with the new "Minix"©®
and induced drag reduction system.
The absence of vibrations generated by the two new high efficiency
engines, located at the rear of the wing and equipped with contra-rotating
three-blade pusher propellers, make this aircraft a very quiet,
extremely stable, easy to handle, smooth to control and quick
to respond to a demand for full power. Another big advantage
of these tail-first "canard" aircraft is that they
do not stall but sink and "porpoise". The proportional
stability of the wing surface of this type of aircraft, with
improved lift and reduced total drag (high CL/CD) and enhanced
energy efficiency with no stabilisers at the rear of the aircraft.
The one-piece, jettisonable, sliding Perspex canopy is of the
high-visibility glider type.
Quadruple market: ULMs, private aircraft, executive aircraft
The concept covers an aircraft powered by heat engines or electric
motors (the selected fuel is safe, new generation solid hydrogen
presenting no storage problems).
A business plan for the period up to 2010 has been drawn up,
and a business corporation will be formed. The patent and the
"Ile de France"©® trademark, representing
part of the capital contribution, will be measured by a specialist
capital contribution assessor.
Manufacture of the 1st "Ile de France" version: 2-seater
ULM with heat engines or electric motors
Manufacture of the 2nd "Ile de France" version: 4-seater
ULM with heat engines or electric motors
Manufacture of the 3rd "Ile de France" version: 6-seater
Manufacture of the 4th "Ile de France" version: hydrogen
Manufacture of the 5th "Ile de France" version: twin-engine
or twin turboprop aircraft/UAV
Manufacture of the 6th "Ile de France" version: 8-
and 10-seater executive aircraft
Customers are looking for a comfortable, attractive aircraft,
easy to fly at slow or high speed, with short landing and takeoff
distances and with a very high safety rating.
Aircraft/UAV IdF Web site: www.idfr.eu/en
The aircraft or UAV specifications and business plan (2006 -
2010) can be supplied on request.
X,Y,Z, Prototypes – 43,
rue Auguste Blanqui – 94600 – Choisy le Roi - France
Siret : 479 247 728 00013 - Code APE/NAF : 332 B - TVA intracommunautaire
Web site :
Phone/fax company : 00 33 1 46804521 - Pocket phone
: 00 33 6 26215412
You can download this specification here