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Moment arm
APEX pin, a pin for joining the two sections of the torsion link on the landing gear.
This range shows the extent of positive righting arm and does not mean safety of heel throughout without capsizing.

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Open the tool →力臂 (lì bì) means “Lever arm, Moment arm”.
力臂 is pronounced lì bì in Mandarin Chinese.
“Lever arm” is 力臂 (lì bì) in Chinese.
This page has 2 example sentences using 力臂, each with pinyin and an English translation.