This video, featuring Shirley Zylstra, the Wildland Fire Chemicals Program Leader for the U.S. Forest Service, demonstrates the effectiveness of long term fire retardant dropped by air tankers, and occasionally by helicopters. In the video that was uploaded to YouTube yesterday, Ms. Zylstra explains how the chemical works even after the water evaporates by interfering with the combustion process.
The video is extremely low resolution, 240p, and looks like it was recorded with a flip phone, but it gets the message across.
We took these photos last week, March 20, at the Aerial Firefighting conference in Sacramento. There were about 90 minutes set aside for displays of firefighting aircraft at McClellan Air Force base, as well as live demonstrations of water and water pellet drops from a helicopter, and the use of the AirTEP Airborne Tactical Extraction Platform marketed by Aerial Machine Tool. We have photos of Coulson’s C-130Q in another article.
Caylym system containers exiting an aircraft. Screen grab from Caylym video.
After they leave the aircraft the container lids, attached by four straps, separate, and act like a parachute. The straps then put pressure on the plastic bladders, ripping them open, allowing the liquid to be dispersed. The 100 pounds of the other components, the plywood, and cardboard, fall to the ground tethered by the nylon straps. The plastic bladder, hopefully empty, falls separately.
The company says 16 units fit inside a C-130. We estimate that each one weighs 2,212 pounds, and 16 of them would hold 4,224 gallons for a total weight of 35,392 pounds. They claim a C-27J can carry 6 units, which would be 1,584 gallons with an estimated weight of 13,272 pounds. A C-130 with a Modular Airborne FireFighting Systems (MAFFS) usually carries 2,200 to 3,000 gallons of retardant, depending on the density altitude and the amount of fuel on board. Last summer the MAFFS were dropping an average of 2,394 gallons per flight.
In November the Romanian Air Force tested the Caylym system using a C-27J Spartan to drop the containers. According to the company:
…Expectations from testing were surpassed — all aspects of safety, handling and deployment of the Guardian System by the C-27J are anticipated to achieve certification from the Alenia test and evaluation team. Follow-up training is planned for the spring of 2013 in Romania.
The C-27J Spartan is an ideal aircraft for the aerial firefighting mission,” said Rick Goddard, managing director of Caylym. “The versatility and responsiveness of the C-27J in a firefighting mission, using the Guardian System gives the Romanian Air Force the ability to drop more than 1,500 gallons (6000 L) per mission, from a safe altitude over all types of terrain, day and night.”
We talked with Rick Goddard, the Managing Director of Caylym, who told us that in their tests the system could deliver six to eight gallons per 100 square feet and even more if the containers were loaded in two rows so that they would exit the aircraft two at a time. Mr. Goddard said they do not expect to spend $100,000 to conduct a standard cup test to determine the exact uniformity and quantity of the retardant coverage until the U.S. Forest Service expresses more of an interest in using the system.
Below is a video that was uploaded by Caylym on January 22, 2013. It shows their containers being assembled, filled, and then dropping from an aircraft.
Caylym has rebranded their system. Formerly called a “precision container aerial delivery system” (PCAD), they have renamed it “Guardian Deployment System”.
If these were ever actually used on a wildfire, there would have to be an even greater emphasis than usual on removing firefighters and other personnel from the target area than there is now when only liquids fall from the sky. In addition, the owner of the land would either have to be OK with leaving the debris from the containers in place after the drop in perpetuity, or crews would have to search the area and carry it out for disposal in a landfill. Debris removal would have to be included in the estimated costs of using a system like this, which could be difficult or even impossible in some areas, complicated by topography and vegetation. Depending on the climate, it could take many years or decades for the plastic bladder, plywood, cardboard, and straps to decompose if it were not removed.