the original rules listed a list of possible engine types, wich were all haveing at least half a ton of weight(or later, with Special engines, atleast the weight was always positive).
also the formula you give tells us the Minimum engine Rating for said vehicle, not the weight.
together you get: you Need an engine Rating of -8, the smallest engines from the list that have that engine Rating(or more) are the ten Point engines, wich have positive weight.
_________________ typos and spelling-mistakes are property of the finder. english is not my mother-tongue.
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