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Behold, the Stringatron -- the world's first high-energy LEGO string accelerator for both loops and open-ended strands... The Stringatron is all LEGO except for the string (1.5 mm twine and 3.0 mm paracord). String transport is done with a pair of pinch rollers. The lower roller is driven by a single RC Race Buggy motor (5292) powered by an old 9V train transformer. A twine loop 1.5 m in circumference running at full power exits the rollers at ~6.6 m/s (24 kph, or 0.000002% the speed of light). The string guides were the tricky part. v The linear actuator dials in launch angles between ~0° and ~85°. (The range can easily be shifted up or down as needed by moving the actuator attachments.) More photos and detailed write-up on MOCpages at http://www.moc-pages.com/moc.php/441459.