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2. TECHNICAL INFORMATION AND OPERATING LIMITATIONS
2.1. TECHNICAL INFORMATION
Wing type
PROFI TL 14
Sail area, sqm
14.5
Wing span, m
10.0
Aspect ratio
6.9
Nose angle, deg
128
Max airspeed, kmph
140+
Stall speed, kmph (with max load)
62
Speed of max glide angle, kmph (with max load)
70
Range
of operating
overloads
Ultimate tested strength, G
+4/-2
+6/-3
Total load max, kg
450
Weight without bag, kg
60.0
2.2. OPERATING LIMITATIONS
* PROFI TL is not designed to fly at bank angle over 60 degrees or pitch angle exceeding 30
degrees. Operation in any of these modes may severely compromise your safety.
* The flying of any trike in presence of turbulence or gusty wind can result in flight inversion,
structural failure of the wing and possible fatal injuries.
* Performance of the wings with laminated leading edge can worsen in wet (rain, thick
fog, dew, etc.) and ice-covering conditions, therefore we do not recommend to fly wings
in such conditions, as this can compromise your safety.
* The
PROFI TL
range of speeds and wing handling really impress and exceed all
expectations. A microlight with this wing accelerates within seconds easily and fast; any
increase in engine power affects directly the speed, not so much the climb rate. This creates
possibilities and qualities for the trike, which the trike pilots in the past only could dream about.
But!
Here are simple and definite dangers:
1) The easy and dynamic acceleration of a trike with the Profi TL wing requires from a pilot
adaptation to a changed handling. The pilot must be experienced enough and with good flying
abilities on trikes to understand the new requirements.
2) During the flight tests we found out that it may be a problem, if the trike Aeros 2-912, Profi
TL has
no
wheel fairings with fins.
In that case the trike tends to progressively turn left when it is flying faster then 110km/h.
The progressive dynamic of such turns definitely startled Aeros test pilots and made them find
out, that limits could be reached which are beyond controllability.
The reasons of this effect we found to be the following:
- powerful engines enable trikes to fly at higher speed, on the other hand they (with the
large and heavy propellers) create a much larger moment around the longitudinal axis
which moves (in case with the Rotax 912) the trike to the left (relative to the wing axis)
with trike nose turning to the right. On the high speed (and high engine RPM) the right
wing begins to slip with lift increasing, in result the trike will turn to the left;
-large, heavy multiblade propeller on high RPM works as gyroscope . So, during
abrupt high speed turn the trike could not follow the wing trajectory(outer wing will slip)
and, because of gyroscopic precession, could change the pitch angle. In this case the
bank of the turn will increase violently;
