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Mindstorms Police Motorcycle


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#1 Kierna

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Posted 12 November 2012 - 03:16 AM

I have the novel idea of making this chase my power functions superbike. I deliberately made it somewhat bland and unnatractive, like real police vehicles.

The target:
Posted Image

The superbike can have LED lights, with any colour lens, installed as tail lights.

One sensor on the police motorcycle is for color, to chase.
The other, an accelerometer, for balance.

One NXT servo motor, for power, geared up 40:8 (5x). theoretical speed up to 6.5 mph.
One NXT servo motor for steering, with very high steering lock, some 50 degrees from center each way.

About 20 degrees of steering rake,1 unit offset, around 3 units trail.
Front fork suspension (represented in this image)
Power motor acts as rear single-sided-swingarm suspension.  Yellow extra hard shock absorber.  Very low center of gravity.  45 degree maximum lean angle.
  Posted Image

Proof of concept: (I didn't make this, it shows that a NXT bike can balance itself)


Edited by Kierna, 12 November 2012 - 11:55 AM.

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#2 Tadej

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Posted 12 November 2012 - 11:03 AM

The unrealistic look makes it robot like :thumbup:

#3 piterx

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Posted 12 November 2012 - 11:20 AM

ahah dude you're a genious :D i love the auto balance that it has!
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#4 kieran

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Posted 12 November 2012 - 11:31 AM

Very cool, looks to work really well, Its nice to see it almost lose control then catch it just in time and rebalance, nice one

#5 Kierna

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Posted 12 November 2012 - 11:37 AM

Just clarifying, I didn't build the bike in the youtube video, it's just proof a Mindstorms bike can self balance.
I'll build this when I have a spare $200 AUD.  I just spent $150 on bricklink for parts for my power functions bike design...
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#6 PsyKater

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Posted 12 November 2012 - 11:39 AM

Thanks for clarifying :wink:
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#7 rm8

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Posted 12 November 2012 - 11:48 AM

Fantastic!!!  I will post it at my page:)

Sad that we don have bigger lego wheels for larger scale:(

#8 Kierna

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Posted 12 November 2012 - 01:05 PM

View Postrm8, on 12 November 2012 - 11:48 AM, said:

Fantastic!!!  I will post it at my page:)

Sad that we don have bigger lego wheels for larger scale:(

Go ahead, I hope your visitors like it!

You are right, the big motorcycle wheels are a very large scale, 1:6 or so.
I think we bike builders deserve a big scale though, because it is very dificult to achive full detail in a motorcycle MOC of any scale.
Have you seen this thread? It covers building very large scal tyres from smaller lego parts.

http://www.eurobrick...opic=42681&st=0
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#9 Burf2000

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Posted 19 November 2012 - 06:01 PM

Thats pretty cool!



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