A ship on hyperdrive could log light-years an hour, but radio waves still had to travel 186,000 mps.
"Ministry of Disturbance"
Henry Beam Piper
To come up his track at 2 mps relative velocity, firing six .
"Slingshot"
Irving W. Lande
A spaceship can log a light-year in sixty-odd hours, but radio waves still crawl along at the same old 186,000 mps.
"Four-Day Planet"
Henry Beam Piper