I don't see that rule.
The only rules that mention springs, explicitly allow them, unless deemed unsafe.
Quote:
<R01> Energy used by FRC ROBOTS, (i.e., stored at the start of a MATCH), shall come only from
the following sources:
A. Electrical energy derived from the onboard 12V battery (see Rule <R34> for specifications
and further details).
B. Compressed air stored in the pneumatic system, stored at a maximum pressure of 120 PSI.
C. A change in the altitude of the ROBOT center of gravity.
D. Storage achieved by deformation of ROBOT parts.
Teams must be very careful when incorporating springs or other items to store
energy on their ROBOT by means of part or material deformation. A ROBOT may be
rejected at inspection if, in the judgment of the inspector, such items are unsafe.
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