Vessels equipped with K-F drives are known as jumpships .
Vessels equipped with K-F drives are range in mass up to 500,000 tons , though warships , a subclass of jumpship hardened against attack and fitted with naval weapons , may mass up to 2.5 million tons .
Vessels equipped with K-F drives are known as jumpships and range in mass up to 500,000 tons , though warships , a subclass of jumpship hardened against attack and fitted with naval weapons , may mass up to 2.5 million tons .