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[FONT=Verdana]7.6 Chassis/Frame[/FONT][FONT=Verdana]
[/FONT] [FONT=Verdana]The chassis is defined as the frame. It must be a steel space frame. Monocoque-type structures are prohibited.[/FONT][FONT=Verdana]
Sheet material affixed to the frame by welding, bonding or riveting, or by bolts or screws which are located closer than six-inch centers, are defined as stress-bearing panels.[/FONT][FONT=Verdana]
The undertray, for safety reasons, shall be a stress-bearing panel. Its curvature must not exceed one inch. The mountings for brake and clutch pedals and cylinders, and for the instrument panel and the bulkhead (panel) behind the driver may be stress-bearing. No other stress-bearing panels are permitted.[/FONT][FONT=Verdana]
Brackets for mounting components, such as the engine, transmission, suspension pickups, instruments, clutch and brake components and body panels may be non-ferrous, of any shape and fastened to the frame in any manner.[/FONT][FONT=Verdana]
Gussets are defined as of steel, fastened to a maximum of two members, and are specifically permitted.[/FONT][FONT=Verdana]
The firewall portion of the bulkhead (panel) must extend the full width of the cockpit and be as high as the top of the carburetor. Forward facing air ducts may be installed for the purpose of delivering air directly to the engine area. Air duct openings may be located within the cockpit provided the firewall is extended to prevent flame and debris from reaching the driver. (Any shape may be used to form firewall extension.)
All firewall inlets must prohibit passage of flame and debris.[/FONT]
Here are the rules as revised for 2010:
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D.7. Chassis/Frame
Formula Ford 1986 construction requirements as of January 1, 1986 as revised January 1, 2010. All new Formula Ford cars are to be built to these specifications covered in D.6 and D.7. (Also required for Formula Continental.)
a. The chassis shall be of steel space-frame construction. Forward facing braces that protecting the driver’s legs and feet shall extend from the front roll hoop to the front bulkhead (The front bulkhead is defined as the transverse section of the frame immediately ahead of the pedals and drivers feet.) The soles of the driver’s feet shall not extend beyond the front edge of the wheel rims (in normal position; (i.e., pedals not depressed) and shall remain behind the front bulkhead. The lower main frame rails shall be a minimum of 25 centimeters (9.84 inches) apart (inside dimension) from the front bulkhead to the rear roll hoop. Monocoque-type structures are prohibited.
A stress bearing floor pan constructed from a minimum of .060 inch heat treated aluminum sheet or 18 gauge steel sheet is required. At a minimum, it shall extend from the front bulkhead to the rear roll hoop bulkhead. Its curvature shall not exceed one inch. The floor pan may be constructed in multiple sections.
The front bulkhead, forward roll hoop (dash hoop) bulkhead and main hoop bulkhead may also utilize stress-bearing panels. No other stress-bearing panels are allowed.
Stress-Bearing Panel Definition: Any sheet material that is attached to the frame by welding, bonding, riveting, threaded fasteners, or any combination thereof, the centers of which are located closer than 6 inches. No materials other than aluminum or sheet steel are allowed for use as stress-bearing panels. Stabilized materials (honeycomb) are not permitted as stress-bearing panels.
b. The area between the upper and lower main frame tubes from the front roll hoop bulkhead to the rear roll hoop bulkhead shall be protected by one of the following methods to prevent the intrusion of objects into the cockpit.
1. Panel(s), minimum of either .060 inch heat treated aluminum (6061-T6 or equivalent) or 18 gauge steel, attached to the outside of the main frame tubes. No other material types will be allowed for these panels.
2. Reinforced body - at minimum, consisting of two layers of 5 ounce, bi-directional, laminated Kevlar material incorporated into the body which shall be securely fastened to the frame. (5 layers are highly recommended.)
For either method, fasteners shall be no closer than 6 inch centers (no stress-bearing panels). The material used for the chassis braces in this area shall be at least equivalent to the roll hoop brace material.
c. A firewall(s) that seals the drivers’ compartment (cockpit) and the engine compartment is required. Forward facing ducts may be installed to delivering air directly to the engine compartment. Air duct openings may be located within the cockpit provided the firewall
is extended to prevent the passage of flame and debris from reaching the driver.
d. Brackets for mounting components, such as the engine, transmission, suspension pickups, instruments, clutch and brake components, and body panels, may be non-ferrous, of any shape, and attached to the frame in any manner.
e. Impact Attenuators: See GCR 9.4.5.G.
f. No engine oil or water tubes are allowed within the cockpit, except for shielded (stainless steel braid) mechanical oil pressure lines. Chassis tubes shall not be used as oil or water transport tubes.
Here are Richard's proposed new rules (I understand they may have been corrected somewhat, but I haven't been provided with a copy):
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General Restrictions
a. The use of carbon fiber and/or Kevlar reinforcement, titanium, ceramic, high strength composites and similar materials is prohibited, unless specifically permitted. The use of the word “unrestricted” in any section does not indicate their allowance.
b. The use of materials other than those specified in section 9.1.1.D.a above for seals, bearing and bearing liners, thread locking systems, windscreens, mirrors, instruments, wiring, electronic systems, electrical systems, cooling, hydraulic and oil systems, etc., is permitted.
...
D.7 Chassis/Frame
Formula Ford 1986 construction requirements as of January 1, 1986 as revised January 1, 201x. All new Formula F and FC cars are to be built to the specifications covered in D.7 and D.8. Exceptions specific to FC are stated in the FC rules.
a. The chassis and all bulkheads shall be of steel tube and panel space-frame construction only.
The soles of the driver’s feet shall not extend beyond the front edge of the wheel rims (in normal position; (i.e., pedals not depressed) and shall remain behind the front bulkhead. The lower main frame rails shall be a minimum of 25 centimeters (9.84 inches) apart (inside dimension) from the front bulkhead to the rear roll hoop.
Forward-facing braces that protect the driver’s legs and feet shall extend from the front roll hoop to the front bulkhead. (The front bulkhead is defined as the vertical and transverse section of the frame immediately ahead of the pedals and drivers feet. This does not preclude a secondary forward bulkhead ahead of this “front” bulkhead.)
Further reinforcement of the frame structure shall be in accordance with the allowances specifically stated herein. No other methods of reinforcement will be allowed. No panels or components other than the required and optional load bearing panels may be attached to the chassis for structural purposes.
The chassis shall carry a mandatory load-bearing floorpan, and may incorporate optional load-bearing bulkhead panels on the main and dash hoops and the front bulkhead immediately ahead of the driver’s feet. The optional bulkhead panels may be attached in the same manner as the floorpan fastening and use the same material requirements.
At a minimum, the floorpan shall extend from the rear main hoop bulkhead to the front bulkhead. Floorpan material is restricted to heat treated aluminum alloy, minimum thickness .060 inch, and/or steel sheet, minimum 18 gauge.
At a minimum, the floorpan shall be attached to the chassis lower rails at or adjacent to its full perimeter by any combination of welding, bonding, riveting, or bolting. The centers between any two adjacent fasteners shall be no more that 6 inches apart. The floorpan may not “wrap up” on to the chassis sides to any point above the top surface of the lower main frame rails.
The floorpan may be constructed in more than one section. For its entire length, the floorpan shall consist of substantially flat panel(s) in plane(s) approximately parallel to the ground plane (not counting chassis “rake”). In addition, “stepped” or sloped floorpans ahead of the dash hoop are permitted, however, the maximum vertical distance from the point of attachment to the base of the main hoop to the point of attachment at the front bulkhead shall be 25.4mm (1 inch).
b. The area between the upper and lower main frame tubes from the front roll hoop bulkhead to the rear roll hoop bulkhead shall be protected by at least one of the following methods to prevent the intrusion of objects into the cockpit.
1. Panel(s): minimum of either .060 inch heat treated aluminum (6061-T6 or equivalent) or 18 gauge steel, securely attached to the outside of the main frame tubes. No other material types will be allowed for these panels.
2. Reinforced body: at a minimum, consisting of a minimum of two layers of 5 ounce, bi-directional, laminated Kevlar material incorporated into the body which shall be securely fastened to the frame. (5 or more layers are highly recommended.)
The steel tubes used for the chassis braces in this area shall be at least equivalent to the roll hoop brace material (equal or greater material stress area and yield strength).
c. A firewall(s) that seals the drivers’ compartment (cockpit) from the engine compartment is required. Forward facing ducts may be installed to deliver air directly to the engine compartment. Air duct openings may be located within the cockpit provided the firewall is extended to prevent the passage of flame and debris from reaching the
driver.
d. Brackets for mounting components, such as the engine, transmission, suspension pickups, instruments, clutch and brake components, and body panels, may be metal, of any shape, and attached to the frame in any manner.
e. Instruments may be mounted in non-metallic panels (e.g., composite or plastic) securely affixed to the dash bulkhead.
f. Impact Attenuators: See GCR 9.4.5.G. Additional attenuators are highly recommended.
g. No engine oil or water tubes are allowed within the cockpit, except for shielded (stainless steel braid) mechanical oil pressure lines. Chassis tubes shall not be used as oil or water transport tubes.
Is this really a "rules clarification?"