airwave Bi-boo Betriebshandbuch Seite 6

the turn and reduce the amount of brake required. The turning is also helped greatly if the passenger
also assists by weight shifting.
Care must be taken not to apply so much brake as to stall, this is however very easy to avoid as the
brake pressure increases greatly as you approach the stall point. Only fly near the stall point if you
have enough height to recover (100 m).
Wing Tip Area Reduction (Big Eears)
The A risers are split into two separate risers allowing the Bi-boo to be big eared easily. The big ear
facility does not allow you to fly in stronger winds, but is a facility which allows the pilot to descend
quickly without substantially reducing the forward speed of the canopy. To engage big ears the pilot
will need to lean forward in the harness and grasp the baby A risers (one in each hand) at the maillon
if he can reach that high, keeping hold of both brake handles if possible. Pull the Baby A risers out and
down at least 30 cm so as to collapse the tips of the glider. It is very important that you are using the
correct risers when doing this manouvre so the other A lines are not affected as this could cause the
leading edge to collapse. Steering is possible by weight shifting with big ears in. If the big ears does
not come out quickly own a pump on the brakes will speed things up.
Before using the big ears facility in earnest it is essential to practice beforehand with plenty of ground
clearance in case a leading adge collapse accurs. Always keep hold of both brakes in order to retain
control. Putting your hands through the brake handles so they remain on your wrists is a good method
of doing this.
B-Line Stall
This is a fast descent method and is a useful emergency procedure. With both hands through the
brake handles, the pilot takes hold of the top of the B risers, one in each hand, and pulls them down
by around 50 cm. When tandem this is very difficult to do, and the pilot may require the help of the
passenger in order to acheive this manouvre, especially if the passenger is heavier than the pilot. A B-
line stall will stall the canopy and forward speed will drop to zero. Make sure you have plenty of ground
clearance because the decent rate can be over 10 m/sec. To increase the descent rate pull harder on
the B riser. When you release the B riser the canopy will automatically start flying again, normally
within two seconds. Sometimes the canopy will turn gently when it exits from the B line stall. It is
normally better to release the B riser fairly quickly rather than slowly as this may result in the canopy
entering deep stall. Always release the riser symetrically as an asymetric release from a B line stall
may result in the glider entering a spin. This manoeuvre is useful when losong a lot of height quickly is
necessary, perhaps when escaping from a thunderstorm. It should not be performed with less than
100 m of ground clearance. (see also Chapter V, part 1)
Spiral Dive
A normal turn can be converted into a strong spiral dive by continuing to apply one brake. The bank
angle and speed of the turn will increase as the downward spiral is continued. Be careful to enter the
spiral gradually as too quick a brake application can cause a spin or an over the nose spiral. The Bi-
boo has been tested for automatic recovery from a spirall dive and will recover automatically from a
spiral dive with a descent rate of up to 14m/sec. In spiral dives with extreemly high descent rates it
may be necessay for the pilot to apply outside brake and weightshift to recover from the spiral.
Care should be taken when exiting from a spiral dive. Too pull out of a steep spiral dive always release
the applied brake gradually. A sharp release of the brake can cause the glider to surge and dive as the
wing converts speed to lift. Always be ready to damp out any potential dive with the brakes. It is
recommended that when you exit from a severe spiral dive that you turn in the opposite direction in
order to avoid flying back into your own tip vortex, which can sometimes cause an unexpected and
violent collapse.
Trimmers
The Bi-boo is sold with special trimmers on the risers and a spare set of trim tabs, which can be
replaced easily when the original pair become worn due to excessive use.
Launching is normally done with the trimmers released so that the glider is at maximum speed. The
glider will come up easier in this configuration. In order to reduce the brake pressure in flight the
trimmers can be applied to the slowest position. Try to avoid using the slowest trimmer position if you
are flying near the bottom of the weight range. If you are near the top of the weight range it is better to
always fly with the trimmers applied (trimmers in slow position), except for the take-off.