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Jun 10, 2013, 11:55 PM
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Jack Crossfire's Avatar
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High speed quad flight


There was much hyping of a 30m/s or 67mph flight mode in Arducopter at the AVC, but so far there have been no videos of this mode controlled by autopilot. 4 months ago, there was 1 blurry video of manual high speed flight of a quad.


ArduCopter V2.9 - Stabilize at high speed (0 min 57 sec)



An autonomous 67mph flight of a quad would take quite a change from the standard helicopter hover code. It would need a transition from the vertical mode to the horizontal mode with only a slight tilt for lift. This is the hardest part for tilt rotors. They usually have a gradient where the feedback from the hovering mode is blended with the feedback from the horizontal mode which is running simultaneously.

The well known hovering mode is:

forward speed -> forward/back balance
turn -> clockwise/counterclockwise balance
altitude ->throttle
sideways slip -> left/right balance

The horizontal mode would be:

forward speed -> throttle
turn -> left/right balance
altitude -> forward/back balance
sideways slip -> clockwise/counterclockwise balance

Basically, it locks the forward speed to a constant value. There's also a new requirement for coordinated turns by synchronizing sideways slip & asymmetric thrust.

The problem is it takes a very large area & a high altitude or a parachute to test horizontal mode. It's not something a private individual can afford. The testing would begin with a human putting it into horizontal mode & then engaging autopilot. The horizontal mode is required if a quad is to replace a fixed wing.
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Jun 11, 2013, 12:32 AM
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slebetman's Avatar
The Kickstarter funded Quadshot have done this quite successfully:

http://www.kickstarter.com/projects/...lis-and-planes

http://transition-robotics.com/

Flite Test - Quadshot - REVIEW (14 min 52 sec)


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