TheMindGarage

[MOC] EV3 Koenigsegg Regera (1:10)

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Well, I didn't update the WIP, and I ended up nearly two months behind my prediction, but I've finally finished it! And as far as I know, this is the first large-scale TECHNIC model of this car published online!

The real Koenigsegg Regera is a groundbreaking "megacar" featuring a 5-litre V8 and three electric motors for a combined 1,479hp (1500PS). But it has no gearbox. Instead, there is one electric motor for each wheel, plus another electric motor coupled to the V8. The electric motors have instant torque and so the car doesn't need a gearbox to reach 250mph in 20 seconds!

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So, the full list of features:

  • Remote-controlled drive - top speed is around 8mph
  • Model of the real car's drivetrain
  • Full independent suspension
  • Castor angle on front axle (this is really important - you'll see why later)
  • Triplex anti-squat bar on rear axle
  • Adjustable camber angle and suspension stiffness for all four wheels - each wheel can be adjusted independently
  • Synchro-dihedral doors
  • Raisable rear wing
  • Opening rear hatch to reveal "engine" bay
  • Cabin with two seats, floor and steering wheel

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The drivetrain starts with a Large motor and a Medium motors (using different gearing). They are hard-coupled, but the gear ratios match very well and the EV3 can control the power it sends to each motor to make sure they aren't forcing each other to speed up/slow down. These motors drive a differential, with one Large motor on each side of the diff, just like in the real car. Then each output is geared up 1:9 to give the required speed - it's kind of a reverse portal-axle. Since the car isn't too heavy (it's about 1.4kg), the bevel gears aren't stressed that much, even with all this gearing up.

I made a simulated dyno graph showing wheel torque and power with wheel speed in mph. This uses the official LEGO specifications of the motors and assumes no drivetrain losses:

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The front suspension is rather complex. All the adjustment controls are shown here:

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Now, you may have noticed there is NO steering rack. This is deliberate because it allows me to have an extra motor for driving. Instead, the motors on either side of the differential run at different speeds to steer, rather like a tank or castorbot. This is why it's so important that the castor angle is high.

The top wishbones are able to slide in and out by 1 stud to change the camber angle. Just in case you wanted to put stance on your £1.9m megacar.

The suspension uses both a torsion bar and a conventional shock absorber. The torsion bar's attachment point can be adjusted with a worm gear, allowing the suspension's stiffness to be changed.

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The rear suspension uses the same shock/torsion bar setup, but with an extra shock absorber between the wheels. This is what Koenigsegg calls Triplex, and it allows softer anti-roll-bars to be used (on this model there are none).

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The rear opens up to reveal the rear suspension. You can see the 24-tooth clutch gears here - those are to keep the rear wing in position.

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The doors are one of the most fun parts of this build. The doors slide forwards, outwards and rotate, all at the same time. They reveal the cabin. Unlike my previous models where the cabin is made a little smaller, the cabin in this model is proper-size.

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The aesthetics were very difficult. Because the front was so low, I decided to incorporate the suspension wishbones into the bodywork. I decided to exaggerate the front bumper, since to me that part of the real car stands out. I don't have any flexible axles, so I used pneumatic hoses for the windscreen. Since the roof's dome shape is very awkward to build, I decided to build it without a roof (all Regeras have removable roofs)! The side air vents don't widen enough towards the rear wheel - they look more like those on the Agera and CCX. Unfortunately, I don't have the right shapes of panels to make the vents properly, so I had to use a little artistic license. The air intakes on top of the car (behind the seats) stood out to me, so I made those prominent. Some have said it looks a bit like a 918 or Carrera GT. I also decided to exaggerate the rear diffuser - it looks almost Lamborghini-like to me (maybe a Veneno). And for some reason, the whole thing conjures up images of a McLaren F1 Longtail - I'm not sure why. But I guess if you combine the F1's speed, the 918's hybrid innovation and the Lambo's flair and doors, you pretty much have a Regera. Wow, that wasn't intended :P.

Finally, here's a video I made. You can see a time-lapse of the building process, the suspension in action and the door mechanism exposed! I compose all my own music for videos - I hope you like it!

 

Edited by TheMindGarage

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The adjustability of the chassis is awesome, i haven't seen anything like this before. I like how you managed to create a somewhat rounded shape with basically rectangular pieces.

Can you explain the torque vectoring a little bit further? From the pictures it seems as if the vectoring motors have to turn for the car to move.

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Wow, you've really put a lot of effort into that suspension.  I like all the adjustability.  Reminds me of an R/C car.

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Very interesting concept, the suspension is awesome. It stinks that there is no room for a steering rack, does it still steer properly?

I agree with @Blakbird it reminds me of a RC car too

It is a little to square but with the lack of panels it still looks okay.

 

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12 hours ago, schraubedrin said:

The adjustability of the chassis is awesome, i haven't seen anything like this before. I like how you managed to create a somewhat rounded shape with basically rectangular pieces.

Can you explain the torque vectoring a little bit further? From the pictures it seems as if the vectoring motors have to turn for the car to move.

When going straight, all four motors are at full power (or near full power to allow for the differences in gearing and RPM). When turning, the motors driving the differential slow a little bit, and the motor on the inside of the turn slows down a lot (twice as much). It's somewhat like a castorbot.

11 hours ago, JJ2 said:

Very interesting concept, the suspension is awesome. It stinks that there is no room for a steering rack, does it still steer properly?

I agree with @Blakbird it reminds me of a RC car too

It is a little to square but with the lack of panels it still looks okay.

 

Yep - the drive motors control it - it's sort of like a tank. Yep - it is a little square because I lack flexible axles. I did experiment with using more pneumatic hoses but the result looked even worse.

Maybe I should make a Lamborghini as my next car since their angular features suit my building style a little better...

13 hours ago, Pat-Ard said:

Sorry, fugly.

Sorry that you don't like the looks - looks aren't my strong point. I'm more of an engineer than a sculptor. Although I am seriously considering the Gumpert Apollo as a future model because when people say it's ugly (which they will), I can just show them the original car :D.

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Don't worry about the looks.......they aren't everyone's cup of tea.  besides...perhaps all viewers need to consider that your model has minds storm in it, which is very umcommon. add to the clunkiness. I love this model and have committed to study more closely it's mechanics this weekend.  don't have  the time while at work but the vector chart is just to tempting . ...

Edited by nerdsforprez

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On 15-12-2016 at 11:51 PM, Pat-Ard said:

Sorry, fugly.

Hi. This is not Facebook or Youtube. It's okay to not like someting, but on EB we do constructive criticism, which entails explaining what you don't like, or what could be better.

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Theres quite some interesting mechanics going on in this regera.. bit bulky yes. but nonetheless a cool moc.

 

Edited by Sylvian
all cool ;)

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Just now, Pat-Ard said:

Sorry, deleted my post. Won't happen again...

Excuse me!

:thumbup:

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On 12/16/2016 at 9:40 AM, nerdsforprez said:

Don't worry about the looks.......they aren't everyone's cup of tea.  besides...perhaps all viewers need to consider that your model has minds storm in it, which is very umcommon. add to the clunkiness. I love this model and have committed to study more closely it's mechanics this weekend.  don't have  the time while at work but the vector chart is just to tempting . ...

I agree, this looks like a great MOC on It's own, and the fact that you incorporated Mindstorms is just. :sweet:

P.S. Source is me owning an NXT set for MOCs. :tongue:

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20 hours ago, The_Icestorm said:

Glad to have found you on this forum! Very nice car, the doors are very well designed.

Why hello there! Glad we'll be able to keep in touch when the LMBs are gone!

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