{"id":1216,"date":"2011-02-12T07:04:49","date_gmt":"2011-02-12T11:04:49","guid":{"rendered":"http:\/\/www.etotheipiplusone.net\/?page_id=1216"},"modified":"2025-02-15T03:27:16","modified_gmt":"2025-02-15T07:27:16","slug":"landbearshark","status":"publish","type":"page","link":"https:\/\/www.etotheipiplusone.net\/?page_id=1216","title":{"rendered":"LandBearShark"},"content":{"rendered":"

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\nLBS modeled in Autodesk Inventor <\/em><\/p>\n

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\n…and in real life (Version 2) <\/em><\/p>\n

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In another example of what happens when parts coalesce upon a wheeled storage utility<\/a> at MITERS,<\/a> I’ve decided to combine the treads of a scrapped industrial snowblower with the body of a scrapped, definitively non-industrial skateboard.<\/p>\n

The initial plan was to have the machine employ dual fingers-free control for tank steering, developed originally for the RazErBlades<\/a> (the board itself is not involved in the vehicle control).\u00a0 Two rewound Turnigy 80\/85 ICBM<\/a>s were to propel the vehicle at up to 25 to 30 miles per hour across all sorts of terrain. Originally designed for rapid transport during the brutal Arctic winter<\/a>, Landbearshark is nowadays more of a demo machine for MITERS<\/a> visitors.<\/p>\n

The first “version” of the finished vehicle instead used conventional DC brush motors<\/a> for ease of control, combined with a custom H-bridge motor driver. LBS used a pistol-grip remote similar to those used on R\/C cars. Because the stock tracks and track sprockets from the snowblower were used, the wheelbase was forced to be artificially short. The vehicle takes a little practice to ride due to its very high center of gravity when a rider is standing on it, and alot of forward-backward lean intervention is needed.<\/p>\n

In 2012, Landbearshark was rebuilt<\/a> to add another two CIM motors and a much more highly geared drivetrain. The vehicle’s “top speed” was reduced significantly to only 10 mph because nobody, myself included, could really stay on it any faster anyway. The resultant gain in torque greatly enhanced the vehicle’s utility – meaning it could actually push through snow and stuff!<\/p>\n

LBS’s build thread<\/a> for your amusement.<\/p>\n

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Specifications<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Vehicle<\/strong><\/td>\nDual tracked vehicle <\/em><\/td>\n<\/tr>\n
Drivetrain<\/strong><\/td>\nChain-driven, pivot-suspended snowblower tracks<\/td>\n<\/tr>\n
Mechanical<\/strong><\/td>\n6061 aluminum and 18-8 stainless steel structure<\/td>\n<\/tr>\n
Motor<\/strong><\/td>\n4 CIM motors (FIRST Robotics regulation drive motors)
\n300W rated ea.<\/td>\n<\/tr>\n
Controller<\/strong><\/td>\nRageBridges<\/a> x 2<\/td>\n<\/tr>\n
Battery<\/strong><\/td>\n19.2v 26Ah lithium nanophosphate battery<\/td>\n<\/tr>\n
Top Speed<\/strong><\/td>\n10MPH<\/td>\n<\/tr>\n
Range<\/strong><\/td>\n3 to 5 miles<\/td>\n<\/tr>\n
Curb Weight<\/strong><\/td>\n55 pounds<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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Video links of LBS are below:<\/p>\n