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Can Bay Area startup’s firefighting drones save us from catastrophe?

by Jon lee Anderson
November 30, 2020
in Tech
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With flame-ravaged Bay Area communities still mired in a tough recovery after California’s worst fire season destroyed more than 1,000 Bay Area homes, a Silicon Valley startup says its artificially intelligent firefighting drones could help stop future catastrophes.

If drones from Rain Industries had been in position around the Bay Area during this August’s lightning storms, the aircraft could have contained 72% of the fires within 10 minutes of ignition, the Palo Alto firm’s co-founder and CEO Maxwell Brodie said. “This is a transformative technology,” Brodie said. “If it is us or someone else that does this, it doesn’t really matter. This will happen.”

After starting out with a smaller, six-rotor prototype drone that successfully doused small fires by dropping balls full of retardant, Rain is now testing autonomous aircraft resembling small helicopters that it says can fly preemptively during potentially hazardous wildfire conditions and use their infrared sensors to locate and combat flames when they first erupt. Alternatively, the drones could take to the air as soon as flames are detected by the hundreds of fire-spotting cameras already positioned throughout California, existing lightning-strike-detection antennas or weather satellites.

“We are going after and solving the rapid response piece,” Brodie said.

A drone resembling a small helicopter used as Palo Alto startup Rain Industries’ “Mark 2” firefighting aircraft (courtesy of Rain Industries) 

Rain’s technology has already drawn interest from area fire officials, including Dixon fire chief Todd McNeal, who had used drones as an “eye in the sky” when he was fire chief in Twain Harte in the Sierra Foothills east of Stockton.

“By no means will they or I ever tell somebody that this will replace firefighters on the ground,” McNeal said. “We’re not going to full autonomy and sit back and let the machines do the work. The intent is to speed up the detection, to speed up the initial response, and deliver some sort of suppression agent to hold it, to slow it down.”

Fires in the western U.S. are regularly setting new records for size and damage, creating an urgent need for new tactics and technologies, McNeal said. Rain’s drones can help “fill in the coverage map” in areas further from fire departments and firefighting aircraft, he said.

The “Mark 2” drones Rain is now testing can carry up to 400 pounds of liquid retardant to extinguish fires or create containment lines that prevent flames from spreading, Brodie said. The company hopes to sell service contracts to Cal Fire and local fire departments, as well as insurance companies and utilities like PG&E that have suffered multi-billion-dollar wildfire losses in recent years.

Rain’s system could be ready to go in a year, Brodie said.

Each drone would be parked inside a secure shelter and launched in response to fire-watch cameras or satellite imagery. It would navigate autonomously to the ignition site using “computer vision,” its infrared sensors feeding data to AI software to estimate the size, growth rate, and direction of the fire, before “deciding” whether to drop retardant on the fire, create a firebreak ahead of it, or summon more drones. Human operators would oversee and approve its operations.

The people behind Palo Alto startup Rain Industries, with an earlier prototype drone (left to right): Ephraim Nowak, chief engineer of autonomous systems, Bryan Hatton, chief technical officer, and Maxwell Brodie, CEO (courtesy of Rain Industries) 

“Drones have certainly come into the forefront in the last several years,” said former Menlo Park Fire Protection District director Bart Spencer, who now works for Rain. “It makes sense that you take something that’s on the cutting edge of technology and you’re adding a firefighting skill to that. You’re getting a resource to a place that oftentimes is not reachable or not reachable in a reasonable amount of time.”

But if Rain is to successfully deploy its drones, it will have to surmount several challenges, including “accurately identifying the sheer number of hot spots in a large and fast-expanding fire,” said UC Berkeley forestry expert William Stewart. Piloted helicopters can accurately drop much larger volumes of retardant, said Stewart, who also cited “the airspace challenge of drones interfering with much larger, and much more effective, helicopters” and potential problems with wildfire-related turbulence.

Brodie acknowledged that high winds are a challenge for drones, and said bigger aircraft tend to handle them better. Rain will test the Mark 2 to determine its wind tolerance, he said. “If we need to go larger than that it’s not fundamentally a problem as far as the technology goes,” Brodie said. “With larger vehicles you need fewer vehicles in an area.”

Brodie pointed out that deploying helicopters in smoky, windy conditions and tight terrain is perilous for pilots. “If you look in places where automation is typically used first, one of the major areas is when things are dangerous,” he said.

Rain has discussed its technology with major California fire departments and Cal Fire, Brodie said. Cal Fire spokeswoman Alisha Herring noted that the agency already uses drones for fire-damage assessment, but hasn’t used them to drop retardant. However, the agency is always looking for emerging technologies that could improve capabilities and safety, she said, adding that Rain’s technology would have to be evaluated and tested by Cal Fire.

PG&E, which received bankruptcy protection in 2019 after being hit with $30 billion in liabilities for damage from wildfires in 2017 and 2018 linked to its equipment, also uses drones to inspect its network, and has helped build the network of fire-spotting cameras that it uses along with satellite imagery to identify fires.

Although a cost estimate for the Rain service isn’t yet available, Dixon fire chief McNeal noted that this year’s fires alone caused billions of dollars in damages and experts believe climate change will continue to bring catastrophic fire seasons. “The cost of the current destruction we’re seeing,” he said, “is going to be ridiculously larger than the cost of this one prong of the possible solution.”

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