Question 1:  Our chassis is a "base line steel design" with no deviations.  Which tab(s) of the structural equivalency are required?

Answer 1:  You must fully fill out the tabs named: "Cover Sheet" and "Chassis Pics".

Question 2: We have 3 equivalencies to prove for holes >4mm in regulated tubing and the sheet will not allow copying of the input/output information for each proof of equivalence. 

However, the sheet does allow creation of a copy of the welded tube inserts sheet in the SES.

Is it allowable to make copies of the welded tube inserts sheet in the SES for each of the equivalencies we need to prove?

If not, how would that information best be presented? 

Answer 2: It is acceptable to make copies of the tab for different insert types, you are asked to do this in cell B2 of the Welded Tubes Insert tab.

Question 3: I am currently filling out the Structural Equivalency Sheet and ran into an issue when entering information for the Main Roll Hoop Bracing Supports. Our Main Hoop Bracing Supports consist of two different sizes of tubing, both meeting the requirements. However, there is only 1 column to enter data into, so how can I enter the data for both sizes of tubing?

Answer 3: Please enter the details for the tube that is the least strong/stiff. The SES reviewer will be able to verify that the other tube is stronger/stiffer from the annotated images you must include in the "Chassis Pics" tab.

Question 4:  We are planning on attaching our front impact attenuator and Anti-Intrusion plate to the front bulkhead of our monocoque by the four bolts (Grade 8.8 M8 fasteners) that the SES is asking equivalency calculations for.  I am assuming that this page of the SES (the one titled MONOCOQUE IA ATTACHMENTS and tabbed B3.35 IA Attachments) is for a case where the Anti-Intrusion Plate and Impact Attenuator were to be glued on or secured in some other fashion.  But since we are using the required bolts, is are we correct in assuming that we do not need to fill out anything on this excel sheet in the SES?

Answer 4:  You will need to prove that each insert in your monocoque for the impact attenuator mounting bolt is at least as strong (in all loading directions) as the M8 bolt itself.

Question 5:  I had a quick question regarding a the "panel height" data required by the SES.  Does the panel height of the laminate only take into account the laminate from a vertical plane?  For instance, on the front bulkhead support structure tab in the SEF cell I:4 requires a panel height.  Obviously in a monocoque chassis construction the front bulkhead is supported by both vertical side walls, the floor, and top of the monocoque.  My question is: what measurements does this panel height take into account?  Does this height include only the vertical side wall height of the monocoque forward of the front roll hoop, or all of the combined heights for the laminate between the front bulkhead and the front roll hoop.

Answer 5: The monocoque section of the SES tab for the front bulkhead support is enforcing rule B3.30.2 so the panel height is for the vertical wall of your front bulkhead support structure.

Question 6:  We are looking to do the report for the impact attenuator but cannot seem to locate what needs to be included for the report if the standard type 12 attenuator is used.  I see the report for non-standard attenuators require testing so if the standard type 12 is used, what kind of testing is required and what needs to be included in the report due by March 1st?

Answer 6: Please include this information:

• Design of the impact attenuator and positioning relative to the anti-intrusion plate (dimensions)

• Dimension of the front bulkhead

• Design of the anti-intrusion plate (material, thickness, dimensions)

• Attachment method of the impact attenuator to the anti-intrusion plate

• Attachment method of the anti-intrusion plate to the front bulkhead

• Receipt of the material, a packing slip or letter of donation