ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAFAGAHAIAJAKALAMANAOAPAQARASATAUAVAWAXAYAZBABBBCBDBEBFBGBHBIBJBKBLBMBNBOBPBQBRBSBTBUBVBWBXBYBZCACBCCCDCECFCGCHCICJCKCLCMCNCOCPCQCRCSCTCUCV
1
University Name
University of North Carolina at AshevilleEQ2023
FSAE Structural Equivalency Spreadsheet (SES), includes Impact Attenuator Document (IAD)
Steel Tube
1.1
Acc Fastener Shear
F.3.2.1F.3.4.1
2
Team Name
UNC Asheville Formula SAEEQ
A round tube which is both the Minimum Diameter and the Minimum Wall Thickness may not meet
3
Competitions
May - ICJune - EVOther - EditOther - EditEQ
There are two versions of the 2023 SES: Steel Tube and Monocoque/Hybrid/Non-Ferrous.
the Moment of Inertia and Cross Sectional Area Requirements.
4
Car Numbers
225EQ
Aluminum equivalance may be used in the Steel Tube SES for Anti-Intrusion, EV Rear Impact, or Accumulator Containers and Mounting.
A square tube which is both the Minimum Width and the Minimum Wall Thickness always meets
5
Team Contact(s)
Nicholas GrandstaffEQ
Steel can be used for any part of the frame in the Monocoque/Hybrid/Non-Ferrous SES.
the Moment of Inertia and Cross Sectional Area Requirements.
6
Email Address(es)
ngrandst@unca.eduEQ
F.3.4.2 - Any and all steel grades are assigned the same material properties. No material properties for different grades may be used in the SES.
7
Faculty AdvisorEmail AddressChassis RulesPowertrainEQ
Teams using multiple chassis in one season: Comment below the SES submission with a link to the SES for the second chassis, before the Action Deadline.
The examples to the right cover the tube location requirements for the FBHS, SIS, and MHBS. There are many solutions not shown that can meet the documentation, triangulation, and bracing requirements.
The examples to the left need to be replaced with your own CAD. Images should be clear, undistorted, moderate filesize. Each SES file 25MB max.
8
Moorthy Muthukrishnannmuthukr@unca.eduAll Steel TubeEV - Steel Accumulator ContainerEQ
9
Only cells of this color can be edited. Enter all values as positive numerals.
Front 3/4 3D CAD with color coded tube sizes required.Rear 3/4 3D CAD with color coded tube sizes required.
10
OverallReady to submit for review?YESDrop down options can be identified by the heavy border. Delete will clear the entry.Top and bottom views required for 30 degree bend check.
11
Each entry, each category, each tab, and the entire sheet are coded as one of the following:
BLANKEQCHECKREJECTN/AUse different colors for square and round.Use different colors for square and round.
12
F.3.1-4 Tube Chassis
EQ
BLUE: NO. BLANK ENTRY. INCOMPLETE. CHECK ALL TABS.
The status of some cells depends on entries in other cells.
13
F.10-11 EV Accumulator
CHECK
This will not change until all required entries are filled out. Check all tabs.
Include a legend that shows each color and size.Include a legend that shows each color and size.Multiple or detail images may be used anywhere in the SES.
14
F.8 Front Protection
EQ
Incomplete submissions will incur a penalty.
SELECT YOUR UNITS. The entire SES will be completed in either mm or Inch. Inch tubing can be entered in mm, and vice versa.
The row numbers are for reference only.
15
F.3.4.3 Welded Inserts
N/A
RED ORANGE: NO. GROUNDS FOR REJECTION. CHECK ALL TABS.
Keep a copy of the rules open to reference rule numbers directly while filling out the SES.
Fuel tank or HV systems must be shown in orange.Fuel tank or HV systems must be shown in orange.
Designating the FBHS as A,B, or C needed to check rule
F.6.2.3.ab
16
F.5.12 Bolted Members
N/A
The SES will permanently REJECT for removing any tab. Fill out a fresh copy.
Fill in all BLANK
sections on ALL TABS. Start with any drop downs in the top left corner of each tab.
The other column letters are for reference only.
17
CHECK
Locate all violations and bring the design into compliance before submitting.
Replace example images with your own clear, undistorted CAD, showing all required dimensions in a moderate filesize. Each SES file 25Mb max.
18
Grounds for rejection could be considered incomplete and incur a penalty.
Read the additional guidance on the right side of this sheet.
Using this 7-color palette will accommodate color blind students or reviewers:




19
SKY: YES. RULES EQUIVALENCE.
http://mkweb.bcgsc.ca/colorblind/
20
Document is ready for review. Double check triangulation.
F.2.2.1
SES forms must be completed and submitted by all teams no later than the date specified in the Action Deadlines on the specific event website.
In the examples to the right:
21
Sheet protection must still be active when submitted, or the SES will be rejected.
DR.3.2.1
Submission of late, blank, incomplete, or previous car's SES will incur a competition point penalty.
THE SKY BLUE LINE is the upper tube
22
YELLOW: YES. CHECK ADDITIONAL EQUIVALENCIES.
DR.3.1.2.b
Do not submit an updated document after the deadline without having the previous document rejected.
THE YELLOW LINE is the lower tube
23
Some entries require additional tubes or documentation.
DR.3.1.2.b
Submit a comment requesting a rejection on your team's SES page on fsaeonline.com. Submissions or comments on FSAEonline.com will send a notification to your reviewer.
BLACK LINES are additional related tubes
24
Once these are added, document is ready for review.
DR.3.1.3
Please respond quickly and thoroughly to requests for revisions or clarifications. Your team's response time influences Tech Inspection order.
RED ORANGE AREAS highlight design aspects that do not meet the rules
25
mmUnitsIN.8.1
Bring an ELECTRONIC copy of the approved SES to Tech Inspection. It is your responsibility to bring a functioning, charged tablet or laptop. Bring backups. DO NOT PRINT.
 White dotted lines
represent potential design changes to an orange area to allow it to pass.
26
IN.1.4
Approval of an SES does not guarantee passing Tech Inspection. The final decision about all designs will be made at Tech Inspection.
27
Use the space below to list changes between uploads, rules inquiries, and any other information.ACRONYMS
28
29
AI
Anti Intrusion Plate
30
IA
Impact Attenuator
31
IC
Internal Combustion
32
EV
Electric Vehicle
33
EQ
Rules Equivalence Achieved
34
FB
Front Bulkhead
35
FBHS
Front Bulkhead Support
36
FH
Front Roll Hoop
37
FHB
Front Hoop Brace
38
HRP
Head Restraint Protection
39
Front Hoop CAD with dimensions required.FBHS, FHB CAD with dimensions required.SIS CAD with dimensions required.MH + SH CAD with dimensions required.MHB, MHBS CAD with dimensions required.Clearance CAD with dimensions required.HV Protection CAD with dimensions.Rear Impact CAD with dimensions required.HV
High Voltage
40
MH
Main Roll Hoop
41
Highlight/trace/color code required tubes.Highlight/trace/color code required tubes.Highlight/trace/color code required tubes.MHB
Main Hoop Brace
42
MHBS
Main Hoop Brace Support
43
N/A
Not Applicable (Not required.)
44
SH
Shoulder Harness Structure
45
SES
Structural Equivalency Spreadsheet
46
SIS
Side Impact Structure
47
48
TRIANGULATION
49
50
51
F.1.17
An arrangement of Frame Members where all members and segments of members
52
between bends or nodes with other structural tubes form a structure composed entirely of triangles.
53
a. This is generally required between an upper member and a lower member, both of which
54
may have multiple segments requiring a diagonal to form multiple triangles.
55
Additional images may be placed below each section.Additional images may be placed below each section.Additional images may be placed below each section.Additional images may be placed below each section.Additional images may be placed below each section.Additional images may be placed below each section.Additional images may be placed below each section.
b. This is also what is meant by “properly triangulated”.
56
EQFront Hoop (FH), Steering ProtectionEQFront Bulkhead Supports (FBHS),EQSide Impact Structure (SIS),EQMain Hoop (MH),EQMain Hoop Braces (MHB),EQHelmet Clearance, Head Restraint,EQAccumulator Side Protection,EQRear Impact Protection (EV Only)
57
The Upper and Lower must maintain spacing and not share a load path.
58
F.5.7.2-3
The FH runs from the lowest frame member on each side. The FH may be multiple pieces.
Front Hoop Braces (FHB)Lap and Sub Belt AttachmentShoulder Harness Bar (SH)Main Hoop Brace Supports (MHBS)Fuel System (IC), Rear Wing MountingTractive and HV Side Protection (EV Only)F.11.2.2
From the rear, below 350mm, all HV components must be protected with an upper tube,
The bottom of the MHB is the only exception to this requirement.
59
F.5.6.2.b
Front view FH bends below the Upper SIS must meet a triangulated FBHS or SIS node.
a lower tube, and a diagonal tube or tubes completely triangulating the upper and lower tubes.
60
F.5.6.2
All FH side view bends must meet a triangulated FBHS or SIS tube end.
There are three basic configurations for the FBHS. See examples starting in column CO.
F.5.8.1-2
The Main Hoop extend, uncut, from the lowest frame member on both sides.
F.5.9.6
The Main Hoop Braces must be one piece, steel, with no bends.
The rollover plane is defined by the direction of the main hoop braces, shown above.
Triangulation may be asymmetric.
F.3.3.2
Non structural tubing will be ignored.
61
A.
Upper FBHS from the top of the FB to the Upper SIS, with a tolerance.
F.6.4.4
Designate the Upper SIS and Lower SIS along their entire length.
F.5.6.2
All bends below the Upper SIS must have an SIS or MHBS tube within 25mm.
Designate the Main Hoop Braces.
F.5.6.5
The dummy's foot must be resting on the brake pedal face.
F.11.1.1F.1.1.j
Accumulators must be within the Primary Structure.
If a plate replaces all three tubes, it must fully overlap the tractive side protection tubes.
Tubes with smaller than 25mm (1in) Outer Diamter will be ignored.
62
EQ
Lower FBHS from the bottom of the FB to the Lower SIS.
Upper SIS height is measured from the lowest point of the top surface of the Lower SIS tube.
F.5.8.3.b
Main Hoop side view bends must be braced to an MHBS or SIS node.
'X' or 'V' MHB configurations are strongly discouraged.
F.11.2.1.a
If the accumulator extends behind the MH, Size B tubes are needed behind the MH.
F.11.2.2.a
Increase from Size C to Size B if the accumulator is < 100mm (3.937in) from the rear impact .
Tubes with Wall thinner than 1.2mm (0.047in) will be ignored.
63
F.5.7
Front Hoop (FH)
Minimum
Tube UsedEQB.
Upper FBHS from the top of FB to above the Upper SIS, braced rearward.
F.6.4.6
The area between the upper and lower SIS must be completely triangulated.
EQ
F.11.2.2.b
The Rear Protection must be fully triangulated back to the Upper and Lower SIS.
64
F.3.2.1.c
Example: 25mm x 2.5mm round
Size ARoundEQ
Lower FBHS from the bottom of the FB to the Lower SIS.
A straight Upper SIS may be intersected by triangulated tubes without being considered bent.
F.6.5.1.a
Tube Shoulder Harness Bars must be one piece of uncut, continuous steel tubing.
F.6.6.2
The MHB must be triangulated back to the Main Hoop at the Upper and Lower SIS.
F.5.6.3.a
Helmet >=50mm (2in) below Roll Hoop plane:
91mmEQT.1.8.5
The accumulator may not be part of the firewall.
If a plate replaces all three tubes, 4x 30kN or 8x 15kN mounts are required.
X-geometry may be used instead of diagonals.
65
F.3.4.1.a
Wall thickness:
22.5mmEQC.
Upper FBHS from the top of FB to above the Upper SIS, braced rearward.
F.3.2.1.f
A bent Upper Side Impact tube requires Size D.
F.6.5.1.b
Tube Shoulder Harness Bars must connect to the Main Hoop at both ends.
F.6.6.2.a
The Upper MHBS runs from MHB to the Upper SIS.
Bolted joints must be documented if a removable panel or tube is used.
66
Outer Diameter (OD):
2525.4mmEQ
Lower FBHS from the bottom of the FB to the Upper SIS, with a tolerance.
F.5.2.3.c
Diagonals for straight or bent upper SIS are both minimum Size B.
F.6.5.2.b
Shoulder Harness Braces must support the middle of SH bends.
Designate the Upper MHBS along its entire length.
EQ
F.11.2.1.a
From the side, below 350mm, the accumulator must be protected with an upper tube,
The SES examples show that quadrilateral openings are unacceptable.
67
Wall thickness:
2.02.5mmEQ
A second Lower FBHS path from the bottom of the FB to the Lower SIS.
F.6.5.2.b
Shoulder Harness Braces must connect back to the Main Hoop, ideally at a node.
F.6.6.2.b
The Lower MHBS runs from MHB to the Lower SIS.
F.5.6.3.bc
Main Hoop Braces protecting Helmet:
RearwardEQ
a lower tube, and a diagonal tube or tubes completely triangulating the upper and lower tubes.
EQ
68
Outer Diameter (OD):
25.025.4mmEQF.6.2.3.a
Designate the Upper FBHS along its entire length.
EQF.6.5.2.b
The larger the SH Brace angle (>=30), the better the moment from the harness is reacted.
Designate the Lower MHBS along its entire length.
F.5.6.3.bc
Helmet >=50mm (2in) below MH to bottom of MHB:
95mmEQ
F.11.2.2.a
Min distance from Accumulator to Rear Impact?
687mmEQ
Exception One:
69
Tube cross sectional area (A):
173180mm^2EQF.6.2.3.c
Designate the Lower FBHS along its entire length.
F.6.4.4.bF.6.4.1
Upper Side Impact Structure (SIS)
StraightEQ
The MHB may act as braces for a bent Shoulder Harness Bar. See column 'F' to the right.
F.6.6.2
The area between the Upper and Lower MHBS must be completely triangulated
F.11.2.1.a
Minimum height for the top edge of the upper tube is the lower of: 240mm above
Tractive Rear Impact Protection
Minimum
3 TubeEQ
1. The space between the two lower paths of a Type-C FBHS is not required to be triangulated.
70
Tube second moment of inertia (I):
1132011930mm^4EQF.6.2.3.d
The area between the Upper and Lower FBHS must be completely triangulated
F.6.4.4.b
Minimum
Tube UsedEQ
SH Brace Angle:
https://www.fsaeonline.com/cdsweb/rqa/ViewFAQ.aspx?faqnum=284
with tubes meeting F.3.4.1 Size C.
Strongly preferred: Locating the fuel fill tube on the opposite side of the exhaust.
the lowest point of the top surface of the Lower SIS tube, or the top of the accumulator.
F.3.2.1.n
Example: 25.4mm x 1.2mm round
Size CRoundEQ
1a. All bends on the lowest tube must still be braced to the corner of another triangle.
71
with tubes meeting F.3.4.1 Size C.
F.3.2.1.e
Example: 25.4mm x 1.6mm round
Size BRoundEQEQF.6.6.2.a
A Shoulder Harness Bar and/or SH Brace may be used as part of the MHBS.
F.3.2.1.c
Wall thickness:
1.21.6mmEQ
72
EQF.3.4.1.b
Wall thickness:
1.21.6mmEQF.5.8.1
Main Hoop (MH)
Minimum
Tube UsedEQEQT.1.6
Heat insulation requirements apply at operating and failure temperatures.
Outer Diameter (OD):
2525.4mmEQ
Exception Two:
73
F.5.7.4
Turned Steering Wheel minimum below FH top:
60mmEQ
X-braces form two segments in side view, and cannot be used for Upper FBHS
Outer Diameter (OD):
2525.4mmEQF.3.2.1.g
Example: 25mm x 2.5mm round
Size ARoundEQF.5.8.3.b
Main Hoop side view bends above Upper SIS must be braced to an MHBS node.
Fuel system inside tire envelope?
IC.1.2N/AT.1.6.3.b
An air gap no less than 25mm is required between the accumulator and the driver's seat.
Wall thickness:
1.21.6mmEQ
2. A diagonal that ends on the Upper and Lower tube may be replaced by a tube with a single bend,
74
in Types B or C without additional triangulation to the center node.
Wall thickness:
1.21.6mmEQF.3.4.1.a
Wall thickness:
22.5mmEQ
Fuel system above bottom surface of chassis?
F.9.1N/A
Outer Diameter (OD):
25.025.4mmEQ
leaving one quadrilateral opening.
75
EQ
V-braces meet at the center at one end, and cannot be used for Upper FBHS in Types B or C.
Outer Diameter (OD):
25.025.4mmEQ
Outer Diameter (OD):
2525.4mmEQMain Hoop Braces may run forward or rearward.
Fuel system including fill tube inside triangulated structure below 350mm?
F.9.1.1.N/AF.11.2.3
Especially towards the rear impact side, accumulators should maintain 25mm
Tube cross sectional area (A):
91120mm^2EQ
2a. The brace for the bent tube must form part of a triangle on both sides.
76
F.5.7.5
FH to Steering Wheel gap <=250mm (9.8in)
100mmEQ
'X' or 'V' FHB configurations are discouraged.
Tube cross sectional area (A):
114120mm^2EQ
Wall thickness:
2.02.5mmEQEQ
Any pressure tanks are metal or separated from exhaust by T.1.6.3?
T.6.1.3N/A
clearance to non-crushable objects. Not including mounts, but preferably including other chassis tubes.
Tube second moment of inertia (I):
66958509mm^4EQ
77
The upper and lower segments of a straight Front Hoop tube (created by the FBHS offset to
Tube second moment of inertia (I):
85098509mm^4EQ
Outer Diameter (OD):
25.025.4mmEQF.5.9.2
Main Hoop brace direction:
RearwardEQ
2 holes, chassis low point? 2 holes between driver & fuel tank? >25mm?
T.5.5.4N/ABent Tubes
78
EQ
the Upper SIS) are treated as one segment.
Tube cross sectional area (A):
173180mm^2EQF.5.9.5
Angle between MH and MHB >=30 degrees:
36.07degreesEQEQ
F.11.2.2.b
The entire top edge of the upper tube or plate must be at least 240mm above
79
F.5.7.6
FH side angle above Upper SIS <=20 degrees:
0degreesEQEQ
Tube second moment of inertia (I):
1132011930mm^4EQT.2.8.3
A straight tube between the MHB is inside the rollover envelope. Head Restraints behind
F.11.2.1.a
Accumulator Side Protection
Minimum
Tube UsedEQ
the lowest point of the top surface of the Lower SIS tube.
80
F.6.3.6
A tube FHB must be straight, without any bends. (One segment.)
Top surface of Lower SIS to Lowest UpperSIS point >=240mm:
244.6mmEQEQ
Main Hoop requires rear structure, either triangulated tubing or F.5.10, see examples G1-G5.
F.3.2.1.m
Example: 25.4mm x 1.6mm round
Size BRoundEQ
All bends and multiple segment members must be braced according to F.5.2.
81
EQ
Designate the Front Hoop Braces.
Top surface of Lower SIS to Highest UpperSIS point <=320mm:
270mmEQEQF.5.9.4
Top of MH of MHB tube, 160mm vertical limit:
62mmEQF.5.10
A single, uncut Size B hoop, attached at the MHB nodes, separate from the Head Restraint,
F.3.4.1.b
Wall thickness:
1.21.6mmEQEQF.5.2.1
The bend radius at the centerline axis must be >= 3 x tube OD.
82
F.6.3.5
FH rearward lean above Upper SIS <= 10, or braced:
0degreesEQF.6.3.3
The FHB should extend all the way to the Front Bulkhead.
Highest and lowest are on the top and bottom of the Upper SIS tube.
25.4mmEQF.6.5
Shoulder Harness Bar (SH)
Bent Round TubeEQ
may be used to Head Restraint envelope. This has no effect on helmet envelopes.
Outer Diameter (OD):
2525.4mmEQ
Top surface of Lower SIS to top Rear Impact >=240mm:
250mmEQF.5.2.3.a
The brace must be at the center of the bend or intersection.
83
Rearward Front Hoop Brace is not required.F.5.6.2
Front FHB that do not reach the FB must end the node of a completely triangulated structure.
Minimum
Tube UsedEQEQ
Wall thickness:
1.21.6mmEQF.5.2.3b
The brace must be at least as big as the largest tube being braced.
84
F.5.6.2
Rear FHB must end at the node of a completely triangulated structure.
EQF.3.2.1.k
Example: 25mm x 2.5mm round
Size ARoundEQF.5.9.1
Main Hoop Brace (MHB)
Minimum
Tube UsedEQF.5.3.3
Weld caps on open ended tubes lacking inserts. Hoops are exempt. Leave weld vents.
Outer Diameter (OD):
25.025.4mmEQ
Outside rear differential carriers may be used for diagonal equivalence.
F.5.2.3.b
The brace must be within 30 degrees of the plane of the bend.
85
EQT.1.3.2
The driver's feet and legs must be completely enclosed by tubes meeting F.3.4.1.
F.6.4.1
Lower / Diagonal SIS
Minimum
Tube UsedEQF.3.4.1.a
Wall thickness:
22.5mmEQF.3.2.1.h
Example: 25.4mm x 1.6mm round
Size BRoundEQ
Tube cross sectional area (A):
114120mm^2EQ
F.11.2.2.d
The mounts or plate extend 25mm above and 25mm below the opening.
The plane of the bend is defined by the straight axes on either side of the bend.
86
F.5.14
Steering rack is inside the FBHS?
InsideEQ
In side view, feet on pedals, structural tubes must be above and below all of feet and legs.
F.3.2.1.e
Example: 25.4mm x 1.6mm round
Size BRoundEQ
Outer Diameter (OD):
2525.4mmEQF.3.4.1.b
Wall thickness:
1.21.6mmEQEQ
Tube second moment of inertia (I):
85098509mm^4EQ
Holes in a plate must be too small for the differential to pass through.
The plane and 30 degree requirement must be considered in 3 dimensions.
87
Additional steering protection is not required.
EQ
Tubes may be added for leg and foot protection.
F.3.4.1.b
Wall thickness:
1.21.6mmEQ
Wall thickness:
2.02.5mmEQ
Outer Diameter (OD):
2525.4mmEQT.2.8.4
Head Restraint >=0 from rollover envelope:
50mmEQ
88
F.6.2.3.b
Rear Front Bulkhead Support (FBHS)
Minimum
Tube UsedN/AEQ
Outer Diameter (OD):
2525.4mmEQ
Outer Diameter (OD):
25.025.4mmEQ
Wall thickness:
1.21.6mmEQF.5.10
Head Restraint Protection Hoop Used?
NoEQEQ
The mounts are considered as beams, seen in the side view.
There is no limit to the number bends.
89
F.3.2.1.b
Example: 25.4mm x 1.2mm round
Size CN/AF.6.2
Front Bulkhead Support (FBHS)
Minimum
Tube UsedEQ
Wall thickness:
1.21.6mmEQ
Tube cross sectional area (A):
173180mm^2EQ
Outer Diameter (OD):
25.025.4mmEQF.3.2.1.h
Example: 25.4mm x 1.6mm round
Size BN/AT.1.6.3.b
Air gap to driver's seat >=25mm:
35mmEQ
Sections should be taken in a plane parallel to the ground. *Plate minimums are more likely to be vertical.
There is no limit to the number or size of triangles used between an Upper and Lower.
90
F.3.4.1.c
Wall thickness:
1.2mmN/AF.3.2.1.b
Example: 25.4mm x 1.2mm round
Size CRoundEQ
Outer Diameter (OD):
25.025.4mmEQ
Tube second moment of inertia (I):
1132011930mm^4EQ
Tube cross sectional area (A):
114120mm^2EQF.3.4.1.b
Wall thickness:
1.2mmN/A
Top surface of HV Protection:
>=240mmEQ
Note: The minimum second moment and the minimum cross sectional area may not be in the same place.
91
Square side:
25mmN/AF.3.4.1.c
Wall thickness:
1.21.6mmEQ
Tube cross sectional area (A):
114120mm^2EQ
Tube second moment of inertia (I):
85098509mm^4EQ
Square side:
25mmN/AGR.1.4 - Good Engineering Practice
92
Wall thickness:
1.2mmN/A
Outer Diameter (OD):
2525.4mmEQ
Tube second moment of inertia (I):
85098509mm^4EQShoulder Harness Bar bends requires braces.
Wall thickness:
1.2mmN/AF.11.1.3F.1.13
HV Components must be within the Rollover Protection Envelope.
Take the area and moment of inertia of the one mount.
93
Square side:
25.0mmN/A
Wall thickness:
1.21.6mmEQEQ
Square side:
25.0mmN/AF.11.1.2
Outboard wheel motors are the only exception.
If they are identical, these values can be multiplied by two.
94
Tube cross sectional area (A):
91mm^2N/A
Outer Diameter (OD):
25.025.4mmEQT.2.4.2F.3.2.1.j
Lap and sub belts attachments must be located on minimum Size B tubes.
EQF.6.6
Main Hoop Brace Support (MHBS)
Minimum
Tube UsedEQ
Tube cross sectional area (A):
114mm^2N/A
If they are unique, add the values from the second mount.
GR.1.4 Chassis catch all:
95
Tube second moment of inertia (I):
6695mm^4N/A
Tube cross sectional area (A):
91120mm^2EQF.6.5.2.b
Brace angle to plane of SH side view >= 30:
62.53degreesEQF.3.2.1.i
Example: 25.4mm x 1.2mm round
Size CRoundEQ
Tube second moment of inertia (I):
8509mm^4N/A
F.11.2.1.a
From the side, below 350mm, all HV components must be protected with an upper tube,
No openings up to Upper SIS Height may allow a 254mm diameter impactor to pass through.
96
Tube second moment of inertia (I):
66958509mm^4EQEQF.3.4.1.c
Wall thickness:
1.21.6mmEQ
a lower tube, and a diagonal tube or tubes completely triangulating the upper and lower tubes.
If mounts are identical, R is the same centroid distance in each, and is the value used.
The top of the impactor will not be raised above the maximum Upper SIS height permitted by rules.
97
T.2.4.2F.3.2.1.j
Minimum Lap/Sub Belt Tube
Minimum
Tube UsedEQF.5.2.3
The plane of a bent tube is defined by the straight axes on either side of the bend.
Outer Diameter (OD):
2525.4mmEQF.5.11
Wing mounts and other items outside the rollover envelope buckle the MH or MHB.
If mounts are asymmetric, average the centroid values for R.
98
EQF.3.2.1.j
Example: 25.4mm x 1.6mm round
Size BSquareEQ
Wall thickness:
1.21.6mmEQ
F.5.11.2.a
Place rear wing mounts at nodes, or away from the MH and MHB.
EQ
99
F.6.2.3.a
Top of FB to Upper FBHS tube, 50mm vertical limit:
30mmEQF.3.4.1.b
Wall thickness:
1.21.6mmEQShoulder Harness Bar bends requires braces.
Outer Diameter (OD):
25.025.4mmEQ
Suspension pickups or rocker mounts on the MHB must be at fully triangulated nodes.
F.11.2.1.b
Tractive Side Protection
Minimum
Tube UsedEQEQ
100
Square side:
2525.4mmEQEQ
Tube cross sectional area (A):
91120mm^2EQF.5.11.3
Wing mounts should not point at the driver. In failure, try to keep outside chassis tubes.
F.3.2.1.n
Example: 25.4mm x 1.2mm round
Size CRoundEQ
F.11.2.2.a
Rear Impact Tubes Replaced:
0EQ