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The Crossbow 2s is a servo-driven version of the Crossbow
2. In place of the modular gear unit, it has a mount for two
standard size servos to flap the wings.
The
Crossbow 2s requires two Hitec
HSB-9360TH brushless servos for flapping the wings, and
two HS-5087MH
servos for the tail steering mechanism. You will need a 1000mAh,
7.4 volt lithium battery, radio control transmitter and receiver,
and a microcontroller such as Adafruit
QT Py to control the wing flapping. You will have to do
some wiring and programming to complete this project.
The
servo-driven Crossbow 2s offers many advantages over the conventional
ornithopter. You can achieve variable
amplitude wing flapping, which offers more stable descents
and smoother transition to gliding flight. You can set the
wings in any position for gliding, or actively control the
wing position. The wings and tail can work together for improved
steering. When the power is off, you can raise the wings straight
up for convenient transportation and storage. Tests have shown
similar rate of climb to the original version, while offering
much quieter flight.
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