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RC Glossary


New to the RC Hobbies? What does buggy, bulkhead, nitro mean in radio control car hobbies? Check out the glossary for remote control cars below.


  • Underbody --
  • On a real car, a smooth underbody makes the drag of the car much lower at high speeds. In RC racing you don't need to worry about this, because a totally smooth underbody means that no cooling air gets to the electronics or engine. The RS4 Rally comes with an underbody to help keep dirt and rocks away from the drive train. The RS4 Pro 2 now has an optional underbody for racers in wet or dirty areas.

  • Understeer --
  • "(also called """"push"""") When your car just doesn't seem to be turning as sharp as it should, or it can't stay in the low groove and keeps drifting to the outside of sweeper turns, your car is experiencing push, or understeer. The front wheels of a car that is understeering don't have enough grip, so when you try to steer, the car may continue to go straight ahead, or just seem to not turn as much as it should. Easy solutions include slowing down or adding downforce, but more severe problems may need tire, shock or weight adjustments."

  • Universal Dogbone --
  • A driveshaft that combines the conventional dogbone and axle into one unit, providing more efficiency and power transfer.

  • Unloading --
  • "At some points on a race track, the inside wheels can lift up because of high cornering forces. This causes a normal ball diff or gear diff to transfer all the available power to the wheel that is in the air. (For an example of this, pull the throttle gently on your car while holding one tire - all the power at that end of the car will go to the opposite, free, wheel.) This is because the differential will put any power at the wheel that is the easiest to turn. This is called diff """"unloading"""". To counter this, racers sometimes use one-way diffs, which allow the tires connected to the one-way diff to continue providing power the wheel on the ground, even if a wheel on the same axle is in the air."

  • Upper Arm --
  • Similar to a camber link, except that instead of a turnbuckle with ball ends at each end, the upper arm features a wider hinge area on the inner link, using a hinge pin to pivot on. The outer link usually uses a single attachment point, normally a rod end or pivot ball.

  • Upright --
  • A hub carrier used on some models (especially?on the rear wheels)?that utilize C hubs and H arms. The bottom of the upright is attached to the arm with a hinge pin, and the top is attached to the chassis with a fixed link, threaded rod, or turnbuckle. Hub carriers in general are often referred to as uprights.

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