Assertion: tank's speed | /r/HasProperty | achieved
Facets:
value: by weakening the motor field
type: MANNER
Source sentences:
text: However, during actual field testing, the maximum speed achieved on hard surfaces was 13 kilometres per hour (8.1 mph) with full motor field, and by weakening the motor field to a minimum, a top speed of 22 kilometres per hour (14 mph) was achieved.