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Introduction to the Sukhoi SU-31
For over a decade the SU-31 has earned the reputation of being one of the best and most successful aerobatic aircraft
of all times. Besides the naked facts, some just love it because of its looks, some just because of the huge cowl hous-
ing a round engine. Our 3m SU-31 represents all these qualities and the new, smaller version is building right on this
legacy.
With 2.75m wingspan this aircraft is just that little bit bigger than a typical 100cc aerobatic plane, and just that little bit
smaller than giant the 3m machines which not everybody can transport and store so easily. The 2.75m wingspan has
proven to be the golden compromise for many.
However, CARF-Models can offer this airplane also with a typical 2.6m wing, which makes it even more a pattern ma-
chine, perfectly suited for F3A-X. Almost square dimensions will give any pilot the competitive edge over most of the
pack. And if 3D flying is preferred, the 2.75m wing with its thick trailing edges is putting the model into action in any air-
show or freestyle contest.
As usual, with our SU-31 2.75m you get an extremely well prefabricated airplane. It is super-strong, yet light weight and
well-engineered for the flying stresses in competition. Made for 100-120 cc engines, it will also house the 3W 114 four
cylinder engine, which many favour in this class.
A 40 mm aluminium tube as a standard wing joiner has proven to be sufficient for this size of airplane and can be up-
graded by the many aftermarket carbon tubes available today. Why did we make the two wings? Mainly to allow this
plane to become a leading figure in the German F3A-X contest rounds, where the wing span is limited.
Sukhoi SU 31—2.75m/2.6m
Wings:
The 2.75 m wing has not only extended wing tips, it also has
a slightly thicker airfoil, resulting in a thick trailing edge of 5-
10 mm from tip to root. It is designed for 2 aileron servos,
where the outer servo has been moved inwards. A single
servo setup doesn't seem to be working safely anymore,
since the torque of the extremely powerful servos needs to
be brought into the aileron somehow, and the light weight
structure of a control surface can only take so much load on
one specific point. So the two servos are highly recom-
mended, even though they do not need to be symmetrically
distributed over the wing span.
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