The French canard "IBIS-RJ03"
all-wood construction is classed as a "light aircraft" (in France :
"avion super-léger" A.S.L.) Its empty weight is only 250 kgs (550
lbs) and even though it is a two-seater, dual-flight controls, its
driving power is so low that it can operate with only 60 HP (VW 1835
Roger JUNQUA's research and ultimate choice were guided by low
fuel consumption and low construction coast. As the fuel
consumption was becoming an increasing important factor of operating
cost, it was necessary to look to a low-powered aircraft, while also
striving to develop a plane that was reasonably fast, in order to
reduce even further the kilometre/passenger cost ratio.
Two criteria which are not easy to merge!
But, by adopting the "canard" formula, Roger JUNQUA was able to
obtain the considerable gains following:
"given equivalent weight and power, a classical aircraft
maximum speed is equal to a canard cruising speed, which means
in effect that, at equivalent speeds, the power requirements of
a canard aircraft is only three quarters that of a classical
Therefore a 55 hp engine would appear the adequate minimum at sea
level (approximately 700 t/mn 180 km/h (97 Kts - 111 MPH) at
two-thirds power). A 65 hp is more suitable for this aircraft, but
80 hp overpowered, as it would cause excess fuel consumption.
- The fuel consumption of this aircraft would thus be
13 l/h (3.4 USG) at 200 km/h (110 Kts) i.e. 6.4
litres (1.7 USG) per 100 kms (54 nms - 62 miles)
10.7 l/h (2.8 USG) at 185 km/h (100 Kts) i.e. 5.8
litres per 100 kms (54 nms - 62 miles) in economic conditions
The range provided by this configuration is more than 900 km
(486 NMS - 560 SM), at a cost three times lower than that of
second-class rail travel, not including depreciation.
- To obtain such results it was necessary:
Roger JUNQUA was not anti-plastics, metals, fabrics nor for that
matter "anti-progress", respecting all points of view. Thought it
may be wrong to believe that wood, that most noble material, will be
used in home building for a long time to come, it was still Rogers
JUNQUA's opinion after 50 years of experience in aviation. Despite
what critics say, its durability has been proven beyond doubt: an
old wooden aircraft "Aiglon" built in 1936 using the glues of that
era is still flying in 1999, 63 years later.
Moreover, most amateurs are capable of working with wood more than
with any other material, and it is obviously easier to find an
expert in wood should there be some tricks of the trade unknown of
the amateur builder.
Because of its simplicity, the construction of the IBIS requires
only a minimum of skill. However, the designers strongly recommend
to follow the sequence of work set out in the 150 pages construction
guide, as well as the tricks to be learnt and the snags to be
W HP Range60/60-80
rate of climb
landing distance, ground roll
limiting and recommended speeds
design manoeuvring speed (Va)
never exceed speed (Vne)
stall, power off (Vsl)
landing approach speed
All specifications are based on manufacturer's
Totally enclosed in
wood and Styrofoam, it requires no canvas
covering; no laminar surface on the canard.