Racecraft
Indoor vs. outdoor racing
Prepare for the very different speed, air, surface, launch, stopping, and event formats of warehouse courses, street hills, and permanent outdoor tracks.
SAME CAR, DIFFERENT PROBLEM
Course shape changes which losses dominate.
A long, steep permanent hill builds more speed and makes wheel, alignment, steering, and aerodynamic losses increasingly expensive. A short indoor course may use a constructed ramp, lower terminal speed, tighter shutdown space, and a surface with seams or dust. The stopwatch still measures the entire system, but it weights each part differently.
| Condition | Outdoor hill | Indoor course |
|---|---|---|
| Energy input | Long elevation drop and changing grade | Often a shorter portable ramp and flatter rollout |
| Air | Wind, gusts, density, temperature, and crosswind | More controlled, but building ventilation can still move air |
| Surface | Pavement crown, patches, expansion joints, water, debris | Concrete seams, coatings, dust, transitions, limited lane width |
| Stopping | Usually a long runoff, though course-specific | Often compact and procedurally strict |
| Setup signal | Aero and stability grow important at speed | Launch, rolling resistance, and low-speed alignment can dominate |
OUTDOOR CHECKLIST
Treat weather and grade as setup data.
- Walk the course only when officials permit and study crown, lane transitions, seams, braking markers, and runoff.
- Record air temperature, surface temperature, wind direction, and meaningful gust changes with each test.
- Keep the driver tucked and still, but prioritize a straight, controllable line in crosswind.
- Dry and inspect the permitted components according to official procedure after moisture exposure; never improvise a wheel treatment.
- Recheck geometry after hard braking, transport, or a large pavement strike.
INDOOR CHECKLIST
Short courses amplify launch and procedure.
- Confirm the event is sanctioned and which class, wheel, weight, ramp, and inspection rules apply.
- Practice a motionless gate posture and immediate neutral steering.
- Inspect the transition from ramp to floor and protect legal ground clearance.
- Keep tires, shoes, tools, and ballast from bringing debris onto the racing surface.
- Know the exact shutdown and retrieval procedure before the first run.
A 2010 NDR-sanctioned indoor race in Sharon, Pennsylvania used a roughly 200-foot warehouse course and was reported as slower than street or permanent-track racing. It is a useful historical example, not a promise that every indoor format works the same way.
Do not create separate indoor and outdoor legality from racer habit. The event's published sanction, class rules, inspection sheet, and director control both.
SOURCES & FURTHER READING
Check the primary material.
- Archived indoor NDR racing in Sharon Historical reporting on a short warehouse course; useful context, not current event information.
- ISBD Rule Book - linked for the 2026 World Championship Official PDF currently linked from Race Week resources; the file itself says revised June 2025.
- National Derby Rallies rules hub Official NDR landing page, 2025 tail-weight update, rule books, and inspection links.
- Derby Downs track Official track length, grade profile, facilities, and Akron location.