Manuel d'utilisation (pdf) - Advance

THE BI BETA 2 : LET’S FLY 2GETHER !
The new BI BETA 2 keeps the good points of the BI BETA while improving the balance, performance,
pleasure and ease. Tested for more than 1 year in all flying conditions, its level of performance,
precision and efficiency are those of a performance solo glider. The balance and precision
of the BI BETA 2 is something you will shortly take for granted. It is a sporty glider giving
pleasure to both pilot and passenger. Our Australian importer Godfrey WENNESS and passenger
Suzi SMITH will certainly not contradict us, because despite the fact it is not a «race glider»,
they flew the worlds longest tandem distance in a BI BETA 2 (223 km flown on the 11 January
2000 from Mt Borah). The cross country flying conditions encountered during this flight were
an excellent test of the gliders behavioural characteristics. The level of performance of the BI
BETA 2 will quickly make it the reference in the Biplace category.
The BI BETA 2 is very easy at take-off and landing, that is something essential for a tandem
glider, but the best points are its quality of the turn, precision and flying pleasure same as
a solo glider. The BI BETA 2 is usable for the educational flights in a school as well as for
professional tandem pilots and leasure pilots. It is for a large number of pilots, but
because of the responsibility when flying tandem, it is not a glider for beginners or
occasional pilots.
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THE TECHNIQUE
The BI BETA 2 is a new and original glider, which has no feature in common with
any solo model from our range. Its construction, its profile and suspension layout are
entirely new.
The leading edge of the profile is reinforced with Mylar, which improves its stiffness
and reduces deformations, tension being considerable at this point. To maintain an
exact profile, each cell receives a line, except 6 of them that have a diagonal reinforcement.
The cell width gets smaller as you go from the centre to the wing tip (the last
four being closed off) giving a beautifully clean aerodynamic shape. The three-level suspension
lines have been optimized to reduce drag and make it easier to untangle, without
compromising safety : there are 3 A lines, 3 B + stabilo, 3 C lines and 2 D lines. This stabilizes
pendulum motion effectively, with no adverse effect on manoeuvrability. Control action is
fully coherent, with no lag between the pilot’s movements and those of the glider. The A risers
have an ingenious system to make big ears very easely.