WTF? That's sheer lunacy. 

 'Weight will be in kg's'??? Weight is a *force*; measured in *newtons*. Thrust is a *force* measured in newtons. Divide one by the other; you have a dimensionless constant. kgs are a measure of *mass*. 

 A 'Thrust to weight' ratio isn't a 'thrust to mass' ratio. I am *not* going to condone fucking up units in any article that I contribute to. I don't care if the manufacturers do do it that way; they're stupid idiots. That's worse than lbf and lbm that the imperial units use.