I think this is very fundamental question.

I am wondering why 0.00259 is used as weight-mass conversion ratio, when inch/pound unit is used in Nastran.

Could anyone explain the reasons?


1 Answer 1


It's the inverse of the acceleration of gravity g in imperial units. $$ 1 g = 386.1 in/s^2 $$

$$ 1/g = 0.00259 s^2/in $$

You need that since:

$$ weight = mass * g $$


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.