HALF MOON BAY, Calif. — From a bluff overlooking the Pacific Ocean, a loud pop signals the catapult launch of a small fixed-wing drone that is designed to carry medical supplies to remote locations almost 40 miles away.

The drones are the brainchild of a small group of engineers at a Silicon Valley start-up called Zipline, which plans to begin operating a service with them for the government of Rwanda in July. The fleet of robot planes will initially cover more than half the tiny African nation, creating a highly automated network to shuttle blood and pharmaceuticals to remote locations in hours rather than weeks or months.

Rwanda, one of the world’s poorest nations, was ranked 170th by gross domestic product in 2014 by the International Monetary Fund. And so it is striking that the country will be the first, company executives said, to establish a commercial drone delivery network — putting it ahead of places like the United States, where there have been heavily ballyhooed futuristic drone delivery systems promising urban and suburban package delivery from tech giants such as Amazon and Google.

“The concept of drone ports is something that a very small decision-making unit in the country decided they were going to do,” said Michael Fairbanks, a member of the Rwandan president Paul Kagame’s presidential advisory council. “It took a very short time. It’s something that America could learn from.”