ASC Regulations on Sizing tl;dr
The occupant space by regs is defined by an 835 mm arc pivoting about a designated point. Nothing can be within this arc with the exception of the steering wheel, mirrors, and seats. When occupants are seated normally, with safety-belts and helmets on, no part of the occupant nor the full free range of motion of the occupant's head (with helmet) may extend beyond the occupant cell (defined as roll cage + structural chassis). For ASC there is no minimum amount of space between the occupant's helmet and the extent of the occupant cell. For WSC only, no point of any occupant’s helmet may lie within 50 mm of the extents of the occupant cell.
By regulation, the minimum occupant cell size is based on a 50th percentile male (not including helmet space). Thus, as a team we have a say over who will be able to fit inside our vehicle.
Our Internal Goals for Sizing
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*Data based on North American population (FSAE Rules95th_2016.pdf)
More detailed break-down of height distribution (Anthropometric Reference Data for Children and Adults - CDC; full report in references)There are 3 different scenarios that must be considered when sizing.
Occupant Sizing Scenarios
Race Scenario
This applies primarily to our own drivers and passengers with respect to operating the vehicle on a track and during competition. All occupants will be wearing helmets, carrying ballast (ballasted to 80 kg/ 176 lbs), and acting with a competition mindset (focus on efficiency and performance rather than comfort). We have very much control as to who these drivers/passengers will be.
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*Note that a helmet is not included in any of these measurements
Who We
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Are Attempting to Accommodate
| Front Seat | Rear Seat | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Scenarios | Max Lower | Comfort Lower | Comfort Upper | Max Upper | Max Lower | Comfort Lower | Comfort Upper | Max Upper | |
With Helmet (+3 in.) | 10% Female 5' 0" (152cm) 100lbs (45kg) | 50% Female 5' | |||||||
4" (165cm) 130lbs (59kg) | 50% Male 5' |
9" (180cm) 176lbs (80kg) | 75% Male |
5' |
11" (186cm) 220lbs (100kg) |
5% Female 4' 11" ( |
cm) 100lbs (45kg) |
5% Female 4' 11" ( |
cm) 100lbs (45kg) | 15% Male 5' |
6" (160cm) 150lbs (68kg) | **35% Male 5' |
8" (168cm) 176lbs (80kg) | ||
Without Helmet | 10% Female 5' 0" (152cm) 100lbs (45kg) | 50% Female 5' |
4" (165cm) 130lbs (59kg) | 50% Male 6' 1" (186cm) 220lbs (100kg) | 95% Male 6' |
2" (193cm) 240lbs (109kg) |
5% Female 4' 11" (152cm) 100lbs (45kg) | 5% Female |
4' |
11" (152cm) 100lbs (45kg) | 50% Male 5' |
9" (168cm) 150lbs (68kg) | 75% Male 5' |
11" (175cm) 176lbs (80kg) |
*All height percentiles taken from (Anthropometric Reference Data for Children and Adults - CDC)
**Interpolated data
References
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Regulation Occupant Cell Size
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