( ( ( The moment ) ( of ( inertia tests ) ) ) ( ( were ( performed ( in ( ( all ( three ( primary axes ) ) ) ( using ( torsional ( spring method ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN moment)) (PP (IN of) (NP (NN inertia) (NNS tests)))) (VP (VBD were) (VP (VBN performed) (PP (IN in) (NP (NP (DT all) (CD three) (JJ primary) (NNS axes)) (VP (VBG using) (NP (JJ torsional) (NN spring) (NN method))))))) (. .)))
The moment of inertia tests were performed in all three primary axes using torsional spring method.
(ROOT (S (NP (NNS Centrifuges)) (VP (VBP use) (NP (NN inertia)) (S (VP (TO to) (VP (VB perform) (NP (PRP$ their) (NN task)))))) (. .)))