http://www.legoengineering.com/knowledgemanager en-us http://www.legoengineering.com/knowledgemanager ActiveKB NX knowledgebase@legoengineering.com Thu, 23 May 2013 08:51:36 CDT 20 http://www.legoengineering.com/knowledgemanager/questions/44/ Cause: The car in the picture below has only the motors attached to the bottom of the RCX. It is possible that the car will be able to remain at rest on its own, but as soon as it starts moving th ... LEGOengineering KnowledgeBase Fri, 23 Apr 2010 18:42:03 GMT http://www.legoengineering.com/knowledgemanager/questions/28/ If the wheels are not touching the ground, use bigger wheels or move the motors and axles down.The wheels could be going too fast for their own good. They spin too fast to be able to catch the sur ... LEGOengineering KnowledgeBase Fri, 23 Apr 2010 18:40:39 GMT http://www.legoengineering.com/knowledgemanager/questions/43/ Problem: Crown gear does not run smoothly.Cause: This may be because the horizontal crown gear is resting directly on top of the vertical gear. In other words, the weight of the horizontal crown ... LEGOengineering KnowledgeBase Fri, 23 Apr 2010 03:36:45 GMT http://www.legoengineering.com/knowledgemanager/questions/27/ If the car is driving in the wrong direction, you know that the wheels are turning in the direction that the program tells them to.Change the direction of both motor inputs or the direction of the ... LEGOengineering KnowledgeBase Fri, 23 Apr 2010 03:36:26 GMT http://www.legoengineering.com/knowledgemanager/questions/25/ If the car tips forward or backwards when driven, the car might not be not balanced well. If the front of the car pops up when it is driven forward it is too heavy in the back or too light in ... LEGOengineering KnowledgeBase Fri, 23 Apr 2010 03:10:59 GMT http://www.legoengineering.com/knowledgemanager/questions/26/ Potential causes:The motors are on different power levels.The wheels are not lined up properly (height).The wheels may be bent.Each pair of wheels has the same two wheels.The gears are not lined u ... LEGOengineering KnowledgeBase Wed, 21 Apr 2010 19:00:39 GMT