MAN TGA Racing Truck

[unimog123]

Hey guys, its been a few weeks since my last MOC and now I'm back with a MAN TGA racing truck. To start let me just say that this MOC is most likely replacing my idea for a large Scania flatbed truck.

So the idea is to make a large racing truck and make it go as fast as possible with Lego Power Function motors, in this case 4 L motors and a Servo motor. I do want to give this truck some advanced geometries for the best handling as well, possibly caster angle and kingpin inclination. I will also be giving it all around independent suspension.

Here is what I am modeling:

I am actually basing mine off of the truck in the back, the photo that I originally used was to big.

Here is a summary of the intended specifications:

Propulsion: Rear wheel drive 4 L motors which will also drive a piston engine (# of cylinders is undecided)

Steering: 1 Servo (possibly connected to steering wheel)

Suspension: Independent with caster and kingpin inclination (hopefully)

Rear Spoiler: Might be operated by a small pneumatic cylinder to tilt it

Power Source: 2 Rechargeable battery boxes

Lights: 2 or 3 pairs of LED's

Here is the rear axle so far:

At the moment the hubs are not secured yet because the part of the chassis to which I will secure it has not been made yet. It also has limited suspension movement, just like in the real trucks. And in the background you can see the tires I will be using.

Altogether I hope to finish this beast by the middle of March, since I will need to order some parts (particularly in blue).

Edit: By accident I forgot to say this is a WORK IN PROGRESS topic, so if a moderator could change it to (WIP) MAN TGA Racing Truck that would be great, thanks.

Edited February 21, 2014 by unimog123

[NXT45]

Wow cool! Keep up the good work!

[D3K]

Looking forward to seeing some progress!

If you keep it light, the proposed 4x L-motors will probably be able to give it quite some speed!

[unimog123]

Thanks guys. Yeah D3K I hope to keep the truck at about 3 pounds and the L motors will be geared up 20/16 then 20/12 and then to the diff 20/28. So the final ratio should be at about 450-500 RPMs.

My goal for the top speed is about 4-5 MPH, so I have to make it a have a very efficient drivetrain.

[Marcel1980]

Why dont you make it with rc motors? A truck like this doesnt have to have much torque

[unimog123]

Why dont you make it with rc motors? A truck like this doesnt have to have much torque

I only have 1 RC Buggy motor and I'm trying to see how fast I can make it with Power Function motors. Also I think you are mistaken these trucks have huge amounts of horsepower and even more torque. You can find it in the 4th and 5th paragraphs:

http://auto.howstuffworks.com/auto-racing/motorsports/super-truck-racing1.htm

[unimog123]

More progress:

This is a prototype of the pneumatically adjustable spoiler with 2 small cylinders. As you can see, the suspension module is the base for the spoiler and prevents the spoiler from tilting to the point that it looks almost vertical. Also, when the cylinders are at there lowest position it keeps the spoiler at an almost horizontal angle.

I have also included holes through which the air hoses will go and some places to attach the rear bumper.

D3K, the weight of this axle is already 1/4 pounds.

Edited February 21, 2014 by unimog123

[Rishab N]

This should be interesting and big!