Matt's AR60 based MT

[marinearmeni]

So I've been a big fan of solid axle MT's for a long time. With the whole lockdown thing, I've finally gotten around to putting the ideas I've had in my head into the computer, and from there making what I hope will be a competitive shaft-driven monster truck.

Starting with the axles, they are Vanquish OCP axles with Incision under-drive gears front and rear. I'm running open diffs, front has 20 million diff oil, rear is mostly anti-wear grease with a dollop of 20 million oil. Vanquish C hubs front and rear, Vanquish knuckles in the back for adjustable toe and some slight camber and The Scale Shop camber knuckles in the front.

The link/sway mounts are printed, I will be printing them from a high quality material from Shapeways eventually, right now these are just test pieces from my home printer. I moved the lower mounting point a lot further down and forward. Trailing arms are Vanquish Yeti arms. Swaybars are Vanquish, the bar itself locks into a collar that pivots on flanged bearings that sit in the chassis. Shocks and shock mounts are Tekno parts from our 8th scale cars.

The chassis side plates are 2 pieces per side so I could move the shock mounts closer to the center. This gives more clearance for the shocks (especially near the collars) around the chassis. Currently the chassis is printed but I will be getting it cut from 4mm aluminum. The bottom plate holds the center mount from the Axial EXO Terra and a shorty pack positioned vertically. It too is printed from my home printer, and again I'll be getting a better one eventually. I have 30k in the center diff which I immediately realized was much too light, I'll be changing that out later.

There's a printed ESC tray, rx box, and battery mount between the frame. They're doing double duty as chassis braces.

Thanks for taking a look! All comments/questions are welcomed and encouraged

[MaX-D]

The pics aren't showing up

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[JatoTheRipper]

I see most of the pics. That thing is awesome!

[soze]

Yup, doesn't show for me. Google Photos is hit or miss when trying to share photos.

[marinearmeni]

K, got an Imgur account and re-did the images. Should be good to go now.

[MaX-D]

Looks great!

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[soze]

That's pretty sweet! Nice work!

[701 Technique]

Great start

Is there a reason the shocks look to be fully compressed?

[AK KRAWLER]

Originally Posted by 701 Technique

Great start

Is there a reason the shocks look to be fully compressed?

I think they have boots on them, so it is actually hard to see where they are at in their travel.

[JatoTheRipper]

Originally Posted by AK KRAWLER

I think they have boots on them, so it is actually hard to see where they are at in their travel.

Good eye. I see boots too now that you mention it.

[marinearmeni]

Yeah, these shocks have boots on them. But the upper shock mounting points were a little low on the chassis for the ride height and suspension travel I'm looking for. I've since printed another chassis with the upper mounting points raised higher. I believe I went around 4-6mm higher then what is pictured. I plan on sending the chassis file off to be cut today or tomorrow. I've already sent the other parts off to be printed from stronger material so I can doing some real driving and testing.

[Szczerba]

Looks really well thought out!

Just spit balling here. Think about making a double shear plate that secured the shocks and swaybar back to the chassis. Just a random thought, if you wanted to be sure to make the shocks extra secure to the chassis.

[marinearmeni]

Originally Posted by Szczerba

Looks really well thought out!

Just spit balling here. Think about making a double shear plate that secured the shocks and swaybar back to the chassis. Just a random thought, if you wanted to be sure to make the shocks extra secure to the chassis.

I do have a slight concern about the swaybars being a little far out, but I'm not concerned at all about the shocks. These standoffs are from our 8th scale buggies/truggies and we've never had issues with them. In addition, the mounts are actually connected by a post running between the chassis. It's an Axial 56.5mm threaded link.

If the swaybar ends up being a little too far out I was thinking I'll just cut the end off and move the mounting point in closer to the chassis. With the bend that the Vanquish arms have I can still get the link to be straight even if the bar is shortened.

One cool tuning option I have is that I can run shock standoffs that are 4mm shorter than these if I want. That will move the tops of the shocks in towards the chassis. Right now the shocks are ~1 degree leaning in, the other standoffs will make it ~ 3 degrees.

[2mtech]

This looks cool! Should be interesting.

[zjguy721]

This looks awesome! Nicely done, clean build.

[marinearmeni]

Got my chassis plates in today! Printed parts to arrive tomorrow

[MaX-D]

Very nice!

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[marinearmeni]

Progress? Lol. I'll have it all assembled tomorrow once the printed parts arrive. Can't wait to run it!

[JatoTheRipper]

Nice! Who cut the chassis for you?

And where did you get those blue wires for your Castle ESC?

[ROWDY RACING]

Nice work!