A rule of thumb, the speed limit of flywheel rim should be 6000 fpm for cast iron material and for cast steel flywheel rim at _____ meters/min.

The speed limit for the rim of a flywheel significantly depends on the material from which it is constructed because different materials have varying strength and durability characteristics. The rule of thumb that specifies a speed limit of 6000 feet per minute (fpm) for cast iron is based on the material's ability to withstand tensile and fatigue stresses at high rotational speeds.

When considering cast steel, which exhibits better tensile strength and fatigue resistance compared to cast iron, the acceptable speed limit is higher. The correct conversion of the given cast iron limit into metric units provides the expected threshold for cast steel materials.

To convert the speed limit of cast iron from fpm to meters per minute, the following conversion is applied:

1 foot is approximately 0.3048 meters. Therefore, 6000 fpm can be converted to meters per minute by multiplying:

6000 fpm × 0.3048 m/ft = 1828.8 m/min

In the context of the question, this value serves as a baseline for determining the speed limits for cast steel. Given the increased material performance, additional speed capacity can be safely realized.

The specific answer of 3050 meters per minute suggests a conservative yet reasonable increase above the converted baseline, reflecting the enhanced