Answers.Body: <p>You'll want to read the <a href="http://www.technicbricks.com/2012/07/tbs-techreview-15-9398-4x4-crawler.html" rel="nofollow">TechnicBricks review</a> of that set, which is quite detailed.</p>
  
  <p>In short, there are two new motor types; one of which is a servo motor used to control the direction. As the remote used is the usual on/off one, it means you'll be able to steer right or left, but with no granularity (you can also go straight ahead, of course). The other motor is a regular one, but again the lack of granularity on the remote means you can't modulate the speed of the car.</p>
  
  <p>TechnicBricks also has <a href="http://www.technicbricks.com/2012/08/tbs-technuggets-13-inside-pf-l-motor.html" rel="nofollow">an article dedicated to the two new motors themselves</a>.</p>
  
  <p>Having never really used remote controlled cars, I can't say how it compares to the real stuff. I suppose the lack of speed regulation can be a problem, but you should be able to build a better remote using the <a href="http://www.brickset.com/detail/?Set=8879-1" rel="nofollow">IR Speed Remote Control</a> .</p>
  
  <p>Edit: according to LEGO <a href="http://powerfunctions.lego.com/en-us/ElementSpecs/Default.aspx#Servo" rel="nofollow">the new motors will not be available separately before march 2013</a>, which I suppose means they <strong>will</strong> be available separately.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-22T13:35:02.563Z
Answers.Text: _"build a better remote using the IR Speed Remote Control"_ Anyone considering this should be aware that the Speed Remote Control has no concepts of absolute values, it just detects rotation "clicks" of each control nub and sends "+1" or "-1" signals for the appropriate channels. These then get interpreted by the PF receiver as adjustments to the current output, from -8 to +8. The problem is, there is no mechanism to ensure that any and all signal sent gets received, and lost signals will result in the controller and receiver in desynchronised states (for example remote in 0, but model in -3).
Answers.UserDisplayName: zovits
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-08-28T13:30:38.693Z
Answers.LastActivityDate: 2012-08-30T07:30:11.157Z
Answers.LastEditDate: 2012-08-30T07:30:11.157Z
Answers.UserDisplayName: Joubarc
Answers.Body: <p>It is built like a regular RC car, there is a two channel remote and receiver combo with outputs for a motor channel and for a servo channel. The steering is done with two separate servos (S Motor, as Lego calls it), which are connected in parallel to the receiver.</p>
  
  <p>The remote is a tiny two channel affair with two side-by-side levers that move front to back, like a tank control. One of these is (crudely) converted into a wheel type direction control, which you turn forward or backward for direction control.</p>
  
  <p>The RC system uses infrared, not radio, so you will have to point the remote towards the vehicle. </p>
  
  <p>This whole remote setup might be the biggest letdown with regard to the feel of a proper RC car. That, and maybe the performance of the drive motor. </p>
  
  <p>As far as I know, the radio can be switched to four different channels. </p>
  
  <p>I don't own the set, I just read the build instructions available at <a href="http://service.lego.com/de-de/buildinginstructions/" rel="nofollow noreferrer">Lego</a></p>
  
  <p>There is a video of the vehicle in action at <a href="http://www.frequency.com/video/lego-9398-4x4-crawler-review-sand/55452192/-/5-86985" rel="nofollow noreferrer">Frequency</a>. OMG! They puts the precious in the sand and waters!</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-08-28T13:30:35.090Z
Answers.Text: There's only one servo (SV) motor.
Answers.UserDisplayName: Joubarc
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-08-29T16:11:56.250Z
Answers.Text: Nice video! It looks like it's REALLY SLOW.
Answers.UserDisplayName: tooshel
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2012-08-28T00:16:15.227Z
Answers.LastActivityDate: 2019-12-23T06:44:47.823Z
Answers.LastEditDate: 2019-12-23T06:44:47.823Z
Answers.UserDisplayName: posipiet
Body: <p>Been looking for a good option for creating a remote control car but it seems Lego released an "official" way via the 9398 4X4 Crawler but it's expensive. How does it work? And that's really two questions . . the "how" as in the mechanical part and the "how" as in, does it feel like a regular remote control car? Supposedly there are a few new technic parts in this kit according to this <a href="http://lego.wikia.com/wiki/9398_4x4_Crawler" rel="nofollow">site</a> which I assume are to make it act like a regular remote control car.</p>
  
Tags: <technic><remote-control>
Title: How does the remote control on the 9398 4X4 Crawler work?
UserDisplayName: tooshel
ThreadText: # How does the remote control on the 9398 4X4 Crawler work?
  
  (Asked by: username_0 on 2012-08-27)
  
  Been looking for a good option for creating a remote control car but it seems Lego released an "official" way via the 9398 4X4 Crawler but it's expensive. How does it work? And that's really two questions . . the "how" as in the mechanical part and the "how" as in, does it feel like a regular remote control car? Supposedly there are a few new technic parts in this kit according to this [site](http://lego.wikia.com/wiki/9398_4x4_Crawler) which I assume are to make it act like a regular remote control car.
  
  **Tags:** technic, remote-control
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2012-08-28. Score: 5
  
  You'll want to read the [TechnicBricks review](http://www.technicbricks.com/2012/07/tbs-techreview-15-9398-4x4-crawler.html) of that set, which is quite detailed.
  
  In short, there are two new motor types; one of which is a servo motor used to control the direction. As the remote used is the usual on/off one, it means you'll be able to steer right or left, but with no granularity (you can also go straight ahead, of course). The other motor is a regular one, but again the lack of granularity on the remote means you can't modulate the speed of the car.
  
  TechnicBricks also has [an article dedicated to the two new motors themselves](http://www.technicbricks.com/2012/08/tbs-technuggets-13-inside-pf-l-motor.html).
  
  Having never really used remote controlled cars, I can't say how it compares to the real stuff. I suppose the lack of speed regulation can be a problem, but you should be able to build a better remote using the [IR Speed Remote Control](http://www.brickset.com/detail/?Set=8879-1) .
  
  Edit: according to LEGO [the new motors will not be available separately before march 2013](http://powerfunctions.lego.com/en-us/ElementSpecs/Default.aspx#Servo), which I suppose means they **will** be available separately.
  
  > **Comments:**
  > **username_2**: _"build a better remote using the IR Speed Remote Control"_ Anyone considering this should be aware that the Speed Remote Control has no concepts of absolute values, it just detects rotation "clicks" of each control nub and sends "+1" or "-1" signals for the appropriate channels. These then get interpreted by the PF receiver as adjustments to the current output, from -8 to +8. The problem is, there is no mechanism to ensure that any and all signal sent gets received, and lost signals will result in the controller and receiver in desynchronised states (for example remote in 0, but model in -3).  
  
  ---
  
  ### Answer by username_3 on 2012-08-28. Score: 3
  
  It is built like a regular RC car, there is a two channel remote and receiver combo with outputs for a motor channel and for a servo channel. The steering is done with two separate servos (S Motor, as Lego calls it), which are connected in parallel to the receiver.
  
  The remote is a tiny two channel affair with two side-by-side levers that move front to back, like a tank control. One of these is (crudely) converted into a wheel type direction control, which you turn forward or backward for direction control.
  
  The RC system uses infrared, not radio, so you will have to point the remote towards the vehicle.
  
  This whole remote setup might be the biggest letdown with regard to the feel of a proper RC car. That, and maybe the performance of the drive motor.
  
  As far as I know, the radio can be switched to four different channels.
  
  I don't own the set, I just read the build instructions available at [Lego](http://service.lego.com/de-de/buildinginstructions/)
  
  There is a video of the vehicle in action at [Frequency](http://www.frequency.com/video/lego-9398-4x4-crawler-review-sand/55452192/-/5-86985). OMG! They puts the precious in the sand and waters!
  
  > **Comments:**
  > **username_1**: There's only one servo (SV) motor.  
  > **username_0**: Nice video! It looks like it's REALLY SLOW.  
  
  ---
  
  