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February 26th, 2011 Leave a comment Go to comments

Simple vehicle built for fun. Features 4 driven rubber tracks, chassis elevation system and remote-controlled Zamor cannon.  


Completion date: 24/02/2011
Power: electric (Power Functions)
Dimensions: length 36 studs / width 23 studs / height 50 studs
Weight: 1.14 kg
Suspension: none
Propulsion: 2 x PF Medium motor geared 1:1
Top speed: 1.60 kmph
Motors: 4 x PF Medium, 2 x PF XL

The idea for this vehicle has evolved quite a bit. Initially meant to be a successor of my Moon Rover, since I am deeply fascinated by all the robotic contraptions NASA sends into space, it has gradually became something built rather for fun than for pretending my room’s floor is another planet. It was also important to me to build it without having to take apart my previous construction, which meant that I could use 3 IR receivers and 6 motors at best.

The Prowler has become an opportunity to experiment with a HD video. Having finally a full-HD-capable camera at hand, I was eager to try producing some high quality panoramic video. I have chosen to use Ulead Video Studio to do so, a decision which I severely regretted later, and I started by trying to produce a full HD video, which turned out to require a machine much more powerful than my PC. Having decided on regular HD instead, I proceeded to work on the video, which became increasingly frustrating, as the Ulead software turned out to work really slow.

It seems that the frustration over the video, which I felt compelled to finish against all odds, has affected the work on the model itself. For instance, the two Medium motors geared 1:1 proved incapable of driving over any serious obstacle, and I didn’t want to modify the drivetrain, because it would mean reworking the whole chassis. The live feed camera, which worked flawlessly the day before I started filming, proved unwilling to co-operate with my PC when I needed it to. I’ve tried for a couple of times, but I was unable to get a signal from it, which is why there is no single image from this camera in this video – I just didn’t manage to film it when it worked. Finally, the Zamor launchers proved quite difficult to control remotely. I wanted to have two of them, launched one after another continuously by a single motor with an eccentric mechanism. For some reason – perhaps because my Zamor launchers were brand new – it turned out to require an enormous amount of torque, rendering the eccentric mechanism completely useless, as it would yield to the launcher’s resistance regardless of how much reinforced it was. I have tried a couple of solutions, and eventually settled down on a single launcher with a primitive control system consisting of a single motorized linear actuator. It meant that the launcher control system could not work continuously, but required switching back and forth. In the end, the Zamor launcher proved largely inaccurate anyway. Since the spheres would not always sit in the launcher in exactly the same position, there was a significant spread when firing them. It was acceptable for just having fun and shooting large targets, but it still took me over an hour to get the short at the beginning of the video right.

I would say that it’s a clearly unimportant construction, perhaps something I needed to relax after a long and tedious work on the previous one.  Still, I have learned something from building it, which means that it was worth building anyway.


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Categories: Misc. Tags: ,
  1. Sariel
    March 2nd, 2011 at 23:22 | #1

    It was UVS 11 and my computer is way above the system requirements. I have just started to use Pinnacle Studio 14, and it is SO much better, it can’t be even remotely compared to Ulead’s software.

  2. March 2nd, 2011 at 22:59 | #2

    What version do you have of Ulead Video Studio? I used to use Ulead Video Studio 10 for my videos and it was slow to, but I upgraded to Pro X3 and it was much faster. Also, are you sure your computer meets the system requirements? Because that can slow it down a great deal.

  3. Sariel
    March 2nd, 2011 at 22:28 | #3


    Don’t we all?

  4. March 2nd, 2011 at 21:31 | #4

    Do you hate bieber to? Nice build!!

  5. Sariel
    March 1st, 2011 at 08:28 | #5

    @Jeff Hoffman
    I don’t know, that would have to be tested.

  6. Jeff Hoffman
    March 1st, 2011 at 05:16 | #6

    for the firing mechanism would a large pnuematic piston using your autovalve and a compressor have enough force to fire the zamor? and would that design be able to fire faster?

    Loved the part when you shot bieber.

  7. Bullet
    February 27th, 2011 at 14:12 | #7

    wwwwwwwwwwoooooooooooooooowwwwwwwwwwwww nice project

  8. zin
    February 27th, 2011 at 10:58 | #8

    Another nice piece. featuring mr fluffy :). I’ve quite jealous of him cause he is able to ride some nice vehicle. HA!

  9. Sander
    February 27th, 2011 at 10:42 | #9

    Hi Paul
    Nice project. the video surprised me: I figured you’t make the LA’s push the tips of the tracks down, and tus rotating on the driven axle, making the rover rise up. Instead you’ve kept the tracks as a solid frame. Interesting. Too bad torque has kept you from showing climbing capality. But I’m sure you’ll build a full functionall Rover 3.0 within the coming ten years 😉
    With regard to the firing of spheres; the recent post on Mocpages/youtube of a white tank is fascinating, and seems accurate. But building something like that, would make it a heavy long-term project probably.

    Last but not least: have you seen the movie G-Force? I’m sure that when you and Lucius watch it together, great new MOC’s (or PALOCS*) will come up!


    *PALOC: Paul And Lucius’ own Creations

  10. February 27th, 2011 at 07:27 | #10

    Popieram Ciebie w jednej rzeczy, że tak jak ja nie lubisz Bibera .

  11. Mike
    February 27th, 2011 at 00:27 | #11

    Shoot. OK then just send me some PF stuff haha 😀

  12. Sariel
  13. February 26th, 2011 at 23:20 | #13

    I just wanted to ask where you got the camera that is on the vehicle.
    is it a camcorder or a wireless live camera?

  14. Sariel
    February 26th, 2011 at 22:02 | #14

    Sorry, I’m not giving that one away 😉

    Nie bardzo.

  15. February 26th, 2011 at 20:52 | #15

    Moi zdaniem miałeś fajny pomysł.
    Tylko do jednej rzeczy się przyczepię .
    Czy nie da się skrócić czasu od jednego strzału do drugiego ?

  16. Mike
    February 26th, 2011 at 20:51 | #16

    @Sariel Bull’s eye! So have I won a Tow Truck II or something? 😀

  17. Fernando
    February 26th, 2011 at 17:07 | #17


    I must confess, I was “afraid” you have glued it…. ;D

  18. February 26th, 2011 at 15:15 | #18

    Definitely Your worst video (‘cos it features Bieber). 😛

  19. Sariel
    February 26th, 2011 at 12:37 | #19

    That’s exactly the mechanism that I tested and it turned out too weak – see the description.

  20. bejuizb
    February 26th, 2011 at 12:35 | #20

    Good moc, loved the part where u shot beiber in the face!
    I have a suggestion though, why not connect the motor sideways, and connect a liftarm, like u did with your walker? the liftarm could shot out the 12 zamors fatser that way…..hope u understood what i just said.

  21. Sariel
    February 26th, 2011 at 11:52 | #21


  22. Mike
    February 26th, 2011 at 11:46 | #22

    It’s nice! But what the heck is a Zamor launcher, how does it work? Do the spheres click into some holder, so when the LA pushes them forward, they “click” out of the holder, just as when you use two fingers to shoot a watermelon seed? Did I get it right? 😀

  23. Sariel
    February 26th, 2011 at 11:25 | #23

    No, I got this camera glued to a 2×4 liftarm a long time ago. Obviously, no footage from it was included in the final video 🙂

  24. Fernando
    February 26th, 2011 at 11:04 | #24


    How did you fixed the wireless camera on the holder? Did you taped it?

    BTW, also guess that none of the final shooting video footage, was taken with this camera!?
    It won’t look 720p at all 🙂

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