"Monster Board" High power 4X4 board with ATV tires

Lightweight / Folding / Portable EVs - seats optional
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"Monster Board" High power 4X4 board with ATV tires

Post by recumpence » Jan 06, 2018 8:00 pm

Hey Guys,

As the title suggests, I am beginning my latest build that I am calling the "Monster Board".

This will be a huge skate board. It will be over 4 feet long and 28 inches wide. The wheels are 13 inch kids ATV tires. It will be four wheel drive using two Astro Flight 3210 motors (one per axle). It will be live axle (no differentials). For a street board, solid axles do not work well. But, for an off road application, they work great! The board will have full suspension with 4 to 5 inches of tavel and 8 inches of ground clearance. It will have a total system power potential of nearly 10,000 watts! It will be geared for 15 to 20mph depending on how well it runs at verious speeds. This means it will have crazy torque! The pack will be 6S, 40ah Multistar Lipo running through two Castle Creations ESCs. The axle assemblies (trucks) will consist of go-kart axles, hubs, sprockets, etc. I am building this as a true all terrain board capable of going pretty much anywhere, including snow. Odds are it will not be running this winter. But, I really want it for next year. I plan on being able to tow my son around behind it..... :mrgreen:

Make no mistake, it will be a BRUTE! I expect it to weigh upwards of 75 to 80 pounds. It will be, essentially, a 4X4 go-kart slightly shrunk down that you stand on a lean to steer.

For those of you familiar with my E-bike drive systems, this board will use two of my DaVinci Drives. The motors will run up at 10,000 RPM spinning a toothed belt to a jackshaft, then a #35 kart chain from the jackshaft to the axle. The front and rear axle assemblies will be identical running their own independant drive system.

This is a project I have been thinking about for a few years now and I am finally pulling the trigger on it.

So far I have the following parts in hand;

Wheels
Heim joints for the suspension
Air shocks
wheel hubs
DaVinci Drives and system parts
misc aluminum and steel for the suspension and chassis

I have the following items on order for it;

Axles
motors
ESCs
misc materials

I am guessing it will take around 6 months to get it running. So, be prepared for a long wait. I have a couple huge OEM projects for clients that are taking up most of my spare time. But, I really want this thing running! This is one of the very few projects my wife has shown an interest in. :D

I will post pictures as I have them.

Matt
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Re: "Monster Board" High power 4X4 board with ATV tires

Post by recumpence » Jan 10, 2018 5:23 pm

Here are a few pictures.

The tires are 13 inch diameter. I am using standard go kart hubs. I drilled the rims to the hole pattern for these hubs.

The suspension will consist of custom double wishbones using 3/8 heim joints and mountain bike air shocks.

This build will probably take 6 to 8 months because I have two large OEM projects taking up most of my spare time.

Matt
Attachments
IMG_20180110_31606.jpg
Wheel
IMG_20180110_31606.jpg (41.69 KiB) Viewed 203 times
IMG_20180110_1042.jpg
Hub
IMG_20180110_1042.jpg (35.66 KiB) Viewed 203 times
IMG_20180110_52428.jpg
Hub on wheel
IMG_20180110_52428.jpg (39.04 KiB) Viewed 203 times
IMG_20180110_41425.jpg
Wheel on axle
IMG_20180110_41425.jpg (43.95 KiB) Viewed 203 times
IMG_20180110_6640.jpg
Suspension parts
IMG_20180110_6640.jpg (41.96 KiB) Viewed 203 times
1% of the world's population can think "Outside the box". The rest are firmly stuck within the box. Where are you?

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Re: "Monster Board" High power 4X4 board with ATV tires

Post by recumpence » Jan 10, 2018 10:02 pm

In the pictures you can see I am holding a solid 1 inch axle. That is a standard go kart axle. This board needs two of them. Those things are freaking HEAVY! I am guessing they are over 10 pounds EACH! So, I ordered some hollow one inch 6061-T6 aluminum tube to make my own axles. That should shave at least 15 pounds off the weight of the board.......

Matt
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Re: "Monster Board" High power 4X4 board with ATV tires

Post by Sean9002 » Jan 16, 2018 10:57 pm

Sub'd....this is gona be good :D
OSET 20+ - Custom frame and swingarm, Motorims - 66V
Ruff Cycles Porucho - MXUS 3000w - whitewalls - Gloss black/Pearl blue/copper leaf - custom tanks - bobber saddle
Giant Glory 00 - Clyte X5404 - Hubsinks - 18FET Sinewave
Fuji Nevada S - MXUS 35mm- Hubsinks - 12FET Sinewave

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Re: "Monster Board" High power 4X4 board with ATV tires

Post by recumpence » Jan 17, 2018 2:33 pm

IMG_20180117_1392.jpg
IMG_20180117_1392.jpg (77.91 KiB) Viewed 86 times
A couple "Monster" controllers for the Monster Board! :mrgreen:

Matt
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Re: "Monster Board" High power 4X4 board with ATV tires

Post by recumpence » Jan 17, 2018 2:38 pm

Here you can see the original steel axle next to a hollow 6061-T6 aluminum axle I made. The steel axles weigh in at 7 pounds each while the aluminum axles weigh 1.3 pounds each. That is a savings of 11.4 pounds just in the axles! I have also decided to drop the pack size to save more weight. I was planning on running four Multistar 6S 20ah packs. However, I am dropping that to two packs because it looks like the range from those four packs was way beyond what I need. That reduces the weight of the board another 11 pounds (over 11 pounds)! So, the new axles and different pack size drops the overall weight of the board by nearly 23 pounds! :mrgreen:

Matt
Attachments
IMG_20180117_24658.jpg
IMG_20180117_24658.jpg (83.25 KiB) Viewed 86 times
IMG_20180117_36458.jpg
IMG_20180117_36458.jpg (62.82 KiB) Viewed 86 times
IMG_20180117_47838.jpg
IMG_20180117_47838.jpg (63.65 KiB) Viewed 86 times
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Re: "Monster Board" High power 4X4 board with ATV tires

Post by litespeed » Jan 18, 2018 7:42 am

Sounds like something I could get hurt on......I want to see this.

Tom
I'm married so you know I'm no stranger to pain!

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Re: "Monster Board" High power 4X4 board with ATV tires

Post by GeriatricGeoffrey » Jan 18, 2018 6:06 pm

okay... shut up and take my money!

how much did the aluminum replacement set you back? you have your own machine shop? :D

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Re: "Monster Board" High power 4X4 board with ATV tires

Post by recumpence » Jan 18, 2018 7:00 pm

The aluminum tube was $20 for enough to make two axles from online metals.

I have a few hobby milling machines, lathe, TIG welder, MIG welder, plasma cutter, and the usual drill press and various tools.

You can search my projects in the Non-hub bicycle section to get an idea of what I build.

Matt
1% of the world's population can think "Outside the box". The rest are firmly stuck within the box. Where are you?

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