【How-to】How big is the enterprise

One quarter impulse for the shuttle could be estimated at 1,852 kilometers per second. The Star Trek Voyager Technical Manual, page 13, has full impulse listed as ¼ of the speed of light, which is 167,000,000 mph or 74,770 km/s. One quarter impulse for Voyager would be 18,665 km/s.