Moody formula

Moody formula

[′müd·ē ‚fȯr·myə·lə]

(mechanical engineering)

A formula giving the efficiency e ′ of a field turbine, whose runner has diameter D ′, in terms of the efficiency e of a model turbine, whose runner has diameter D ; e ′ = 1 - (1-e) (D / D ′)^1/5.