EVUL Empire Racing

START HERE

Pick what you race, then gearing, battery, and ripple. Tap a tool, enter your numbers, read the gauge.

START HERE ▶

THIS IS THE GUIDE YOU KNEW YOU NEEDED.
NOBODY HAD WRITTEN IT YET.

So here it is. The calculators and guides are free — no sign-up, no paywall. Every formula is standard engineering, every assumption is labeled, and where a number is an estimate it says so.

Check our work.

Welcome to EVUL Outlaw Laboratories.

EVUL ripple pack at the ESC
THE ORDER

GEARING, BATTERY, THEN RIPPLE

Drag, speed run, truck pull, boat, bash or 1/5 & 1/7: same order for everyone. Gear it so it doesn't grenade, size the pack so it holds, then size the caps at the ESC. Never owned an RC? Start Here explains what 4S means first.

START HERE ▶SOMETHING BROKE? ▶

THE GUIDES

BURST PHYSICS book cover
BOOK · WORK IN PROGRESS

BURST PHYSICS

What really limits a motor in a 2 second pass: copper heat, saturation, magnet demagnetization, rotor speed, timing and windings.

OPEN PDF ▶
GEARING GUIDE cover
PDF GUIDE

GEARING GUIDE

Pinion, spur, ring and pinion: how the gears multiply, rollout and top speed, in pictures.

OPEN PDF ▶
BATTERY GUIDE cover
GUIDE · ALL CLASSES

BATTERY

How much battery: S, parallel, IR and sag. Drag, speed run, truck pull, bash, boats and 1/5 & 1/7.

OPEN GUIDE ▶
RIPPLE PACK BUILD GUIDE cover
PDF GUIDE

RIPPLE PACK BUILD GUIDE

The v2 polymer ripple board: parts, layout, soldering to the ESC leads, and why polymer beats film per gram.

OPEN PDF ▶

WHERE IT STARTED

EVUL 2015 world-record puller on grass with sled box
2015 · WORLD RECORD

319 LB FOR 32 FT

The 2015 world-record puller: 319 lb pulled 32 ft. Everything on this site grew out of builds like this one.