TheAviator
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- Joined
- Jan 18, 2009
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This is my take on the now-classic Hummingbird boost glider. Originally for 13mm A or B impulse motors, I've upsized mine a little for 18mm B or C motors. It uses the tip panels from my flapped S8E glider (that I have yet to build...). Target weight is 30g on glide.
Like the Hummingbird, it features movable flaps that deploy at apogee. The right flap is cut with a lower chord at the tip than the left to give the effect of slight right aileron input. The left wing tip will be weighted for a left-hand turn. The idea is that should a spiral dive develop, the increased speed with allow the aileron input to overcome the tip weight and roll the glider back to stable turning flight.
I've deviated from the original Hummingbird a little for the flap actuation mechanism. Instead of the original pivot pod, I've opted for a more traditional hook style. In place of the pivot pod is a bellcrank that is held down by the hook of the pod. When the pod slides back and is jettisoned, the bellcrank is released, allowing the flaps to deploy.
I've attached pictures of my work so far. The bellcrank is colored red and the pushrod black to make it easier to see. More information to come at a later date.
Like the Hummingbird, it features movable flaps that deploy at apogee. The right flap is cut with a lower chord at the tip than the left to give the effect of slight right aileron input. The left wing tip will be weighted for a left-hand turn. The idea is that should a spiral dive develop, the increased speed with allow the aileron input to overcome the tip weight and roll the glider back to stable turning flight.
I've deviated from the original Hummingbird a little for the flap actuation mechanism. Instead of the original pivot pod, I've opted for a more traditional hook style. In place of the pivot pod is a bellcrank that is held down by the hook of the pod. When the pod slides back and is jettisoned, the bellcrank is released, allowing the flaps to deploy.
I've attached pictures of my work so far. The bellcrank is colored red and the pushrod black to make it easier to see. More information to come at a later date.
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