Drones after a typhoon: designing an emergency relay corridor

Every year, tropical cyclones cross the Philippines. When a strong one makes landfall, the first days are often the hardest: ports close, roads are blocked, power and mobile networks go down, and communities on small islands are cut off. This guide looks at how small drones, working as a relay, could help in that window.

Why the first 72 hours matter

After Super Typhoon Yolanda (Haiyan) made its first landfall at Guiuan, Eastern Samar, in November 2013, and after Typhoon Odette (Rai) struck Siargao, Dinagat, Bohol and Cebu in December 2021, a familiar pattern followed. Large relief operations took time to reach remote islands, while small, urgent needs piled up: insulin and other medicines, blood samples for testing, replacement phone batteries and satellite phones, and simple information about who needed help.

Ships and helicopters carry heavy relief, but they're scarce and busy. Small drones can't carry rice sacks, but they can move the light, urgent items that make a big difference, while bigger assets do the heavy lifting.

The relay idea

A single drone can't fly from one end of the country to the other. A chain of relay pads can. Each pad holds charged battery packs and a small team. A parcel flies one leg, lands, gets a fresh battery or a fresh aircraft, and continues, like a relay baton.

The LipadBox concept maps a Samar–Palawan emergency corridor with 21 pads and 20 legs, about 1,193 km in total:

• Guiuan → Tacloban → Ormoc → Camotes → Lapu-Lapu (Cebu)
• Toledo → San Carlos → Bacolod → Iloilo (Negros and Panay)
• San Jose de Buenavista → Culasi → Caticlan → Semirara (Antique and Aklan)
• San Jose → Apo Reef → Coron → Linapacan → El Nido → Taytay → Roxas → Puerto Princesa (Mindoro and Palawan)

Every leg is under 100 km; the longest is about 93 km, Roxas to Puerto Princesa. You can see the full corridor on the network map by choosing "Samar → Palawan".

Why not just fly straight?

A straight line from Panay to Palawan via Cuyo looks shorter on a map, but the open-water gap is just over 100 km, beyond the range of the long-range drones in this design. Going north through Mindoro and the Calamian Islands adds distance but keeps every hop within range, with somewhere to land at each step. In emergencies, reliable beats short.

What flies in a relief corridor

• Cold-chain medicine such as insulin and vaccines, in insulated boxes
• Diagnostic samples from rural health units to working laboratories
• Communications kits: satellite phones, power banks and radio parts
• Information: aerial photos of damaged areas for local responders

Weather limits and timing

Drones don't fly into typhoons. The corridor is designed for the period after the storm passes, when winds have dropped below safe limits but sea and air transport haven't recovered. Under the PAGASA tropical cyclone wind signal system, routine LipadBox flights would stop once a signal is raised. Relief missions would resume only when local conditions are confirmed safe and coordinated with authorities.

Coordination is everything

A relief corridor only works as part of the official response. In the Philippines that means working with the National Disaster Risk Reduction and Management Council (NDRRMC), the Office of Civil Defense, local DRRM offices, CAAP and the military and coast guard aircraft that share the same low airspace. Drones must be visible in that shared picture, through flight plans, remote identification and clear communication, so they never get in the way of rescue helicopters.

Keeping it ready

A corridor that sits unused for a year won't work on the day it's needed. The practical answer is to use the same pads and drones for everyday deliveries, so batteries are cycled, crews are trained and procedures are rehearsed. When a typhoon hits, the network switches priorities instead of starting from zero.