Fast Street Bike (Self-balancing RC motorcycle)

[amorti]

Since @Piterx has created a buzz around Lego motorcycles, I decided to give this one its own thread at last.

It's a self-balancing RC motorbike, based around a buwizz and a buggy motor.

It's an evolution of @piterx's Fastest Bike, made and published with his blessing.

In the evolution it got much more rigid in the frame and swingarm (it can do @20 km/h so you need the wheels pointing the same direction), and got various visual tweaks converting it from a motocross to a naked street style bike.

But... Does it really work? Is it fast? Yes, and yes.

There's nothing rare/vintage except the tyres (you can use the more common 81.6mm motocross tyres) and nothing expensive except the electric parts. You can do the bodywork in a whole bunch of colours depending what you have available.

For those who aren't purists and/or don't have loads of expensive RC parts lying around, you can also use a CaDA or MouldKing battery with a few small pieces and adding 10g-20g weight either side with a few pennies, etc. Replica buggy motors work fine too, and replica servos are fine if you're not using a buwizz.

If you don't like the 3L crank handles on the front fork, remove them and put a 3L axle with stop each side instead of an 8L with stop the whole way through. It'll lose a little rigidity, but looks nicer.

It's a fun build with a lot going on with all the angle beams, especially around the steering neck. But the focus is on playing, and marvelling at what Lego can do.

More images and instructions available on Rebrickable: https://rebrickable.com/mocs/MOC-83960/A_morti/fast-street-bike-self-balancing-rc-motorcycle/#details

 

Edited September 10, 2021 by amorti

[piterx]

this bike rips :D 
these wheels with the buggy motor with that weight are just perfect together
I'm happy you and the guy from the video had fun with it :)

[amorti]

@Mechbuilds - think it was you who didn't like the gap in the swingarm.

I'm not fully sold... but what says EB?

Swingarm from liftarms?

or Swingarm from a panel?

 

The panel is simpler with 8 less pieces.

You could probably argue the panel is stronger, but I reckon they're about equally strong for practical purposes.

Edited September 10, 2021 by amorti

[howitzer]

The version with liftarms looks better.

[Mechbuilds]

Well the panel looks clean and less bulky. 

[thekoRngear]

Swingarm from liftarms is for me 

[amorti]

For me, as it is, the panel looks too bulky since it's 11 long where it only needs to be 9.

If it were made as a set you'd use the panel and put a sticker on it which replicated a real bike's swingarm. Maybe put the motor on the left where the chain would normally be on a real bike and the panel on the other side and have a brake caliper illustrated.

[thekoRngear]

3 hours ago, amorti said:

Maybe put the motor on the left where the chain would normally be on a real bike and the panel on the other side and have a brake caliper illustrated.

[amorti]

On 9/12/2021 at 1:54 PM, amorti said:

If it were made as a set you'd use the panel and put a sticker on it which replicated a real bike's swingarm. 

Funny enough, that's exactly what they did on the new BMW bike.

Few small changes on the Fast Bike in the meantime since this thread: better-looking headlight (model team rim and 2x radar dishes), side stand that doesn't necessarily have to be removed before play time (change from #4 to #3 connector), remove a few superfluous pieces, price drop from 5€ to 3€.

Edited January 31, 2022 by amorti