Safety 1st MO140 Specifications download pdf (Page 69)

Chapter 14:

ROLL OVER PROTECTIONS

1. The Driver Roll Over Protection (ROP) has been designed in co-operation with

specialists in order to protect the driver in the event of his vehicle tipping over during a

tractor pulling competition.

2. The design, or the ROP built according to the given specifications, are not to be

understood as an automatic guarantee, as for providing an always adequate protection

for the driver during an accident with the tractor.

3. The ROP specifications must be seen as a set of minimum requirements and advisory

guidelines.

4. Neither the ETPC Board, the T&S Board nor any of their members can be made

responsible for consequences resulting from the application of the ROP specifications or

malfunction of the safety devices in question.

A. General Considerations

1. The construction must allow an easy exit for the driver in the event of a fire etc.

2. Tractors weighing more than 4000 kg are recommended to have a tube wall thickness

0.5 mm higher, or more, than specified.

3. If team drivers or tractor constructors think that the ROP constructions specified below

are not solid enough, they are free to make them stronger.

4. All NTPA certified ROP cages are permitted by the ETPC.

5. No ballast can be hung from or attached to any portion of the ROP-structure. Chassis-

attachment is exempt of this rule.

B. Construction

1. Bending radius of all tubing should be as wide as possible, the minimum is two (2) times

the outside diameter of the tube being bent.

2. All fastening bolts must be grade 8.8 or better, this must be clearly marked on the head

of the bolt.

3. All welded joints must be welded by an experienced professional; a steel filler metal must

be employed that is compatible with the base metal.

4. All weldings must be done according to generally accepted welding practices.

5. No grinding on any welding.

6. All structural material for the ROP shall be seamless mild steel (carbon mechanical) tube

or normalized chrome molybdene (DIN Norm 25 CrMo 4) seamless steel tube.

7. Tubing diameters and wall thicknesses are nominal measurements.

8. The dimensional locations of the main structural hoops and secondary tubing shown in

the figures are to be used as guidelines but must remain within 20% of the dimensions

specified in the figures.

The maximum backward inclination of the cage is 20 degrees.

9. Tubing size and material shown in the figures and tables are minimum

requirements!

10. There shall be a minimum of 50 mm between the main hoops and the driver s helmet,

both vertically and laterally, with the driver seated in normal position.

11. In order to avoid possible neck injury, the horizontal distance between the main hoops

and the driver’s helmet must not be over 200 mm.

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Safety 1st MO140 Specifications Page 69

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