Limiting the wheel extension prevents traps against furniture legs and when backing into walls, where the extension sensor is tripped.
http://www.robotreviews.com/ch…opic.php?p=138691#p138691
PowerBot Neigung Reduktion Mod
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9350 Turbo model improved
The 9350 Turbo model added counter weights in the front for improved suspension balance correcting some of these problems.