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Ottercar

The OtterCar is my vehicle for the HackyRacers competition at emfcamp

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It is based upon a BobbyCar https://www.big.de/de/produkte/big-bobby-car/ has been and still is one of the most know outdoor kids toys in germany.

The OtterCar is based upon an existing project: https://twitter.com/FauthNiklas/status/980080483164983296

  • 1 × BobbyCar
  • 2 × Hoverboards
  • 1 × Passives
  • 1 × Throttle Lever
  • 1 × Battery

  • Bumpers and Brakes

    Jan--Henrik08/30/2018 at 08:57 0 comments

    As required i still needed Bumpers and a brake. I tried to build bumpers, but they where horrible *cough*.

    So I decided to rebuild them, the new ones had to be lighter, smaller and much more sturdy. I started with a metall frame which can be screwed to the bottom side of my OtterCar.

    To that I mounted the brake, which then pressed to metal pieces on the rear wheels.

    The front was then bend up, so it won't touch the ground on uneven terrain.

    That already concludes the bumpers (beside some foam, which can be added later) and makes the Bobbycar fulfill most of the requirements. 

  • New Motors

    Jan--Henrik08/30/2018 at 08:41 0 comments

    After fixing the wheel suspension the new motors where added. Every motor has a power of ~350W, they are very similar to the smaller ones, in fact the inside is the same. As clearly visible they feature a wider profile which should be profitable on grass.

  • Wheel suspension

    Jan--Henrik08/30/2018 at 08:37 0 comments

    For the wheel suspension a friend of mine started to mill them from aluminium, sadly it didn't finish in time, so we had to come up with a different idea.

    Niklas then came up with a mixture of 3D prints and welded metal.

    While installing we found that there was still some play, therefore we added a little bit of PTFE.

  • In repair and planning

    Jan--Henrik08/22/2018 at 14:58 0 comments

    Before we start, there's one more thing that needs fixing. As you can see on the picture, the front right suspension is broken. This is not surprising now that it is printed from PETG and has been in operation for half a year.

    The new wheel suspensions will be milled from aluminium and should therefore be much more robust.


    Beside the broken wheel suspension I can already plan ahead what exactly I need to do.

    First of all the wheel to wheel distance should be at least 450mm, mine is only ~300mm. To fit this rule I want to exchange the Motors with new ones, which have a longer shaft and have a wider profile.

    The Moving objects should have a bumper to protect your own feet as well as other racers.

    As mentioned above my feet have to be protected, that will be solved with the bumper.

    Each racer needs to have a fuse to limit the input current, so that the competition is fair to everyone.

    Also every racer needs to have a power switch.

  • Hackyracers

    Jan--Henrik08/22/2018 at 14:46 0 comments

    In order to participate in the HackyRacer competition on the emfcamp site, a moving object/racing car is of course required. Since I have motorized a Bobbycar before, I already have one such racing car. That's why this project shows how to make it conform to the rules, but also a little bit how to build the bobby car.

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