In a video report Thursday about Tanker 41, “the latest weapon in the firefighting arsenal”, Neptune’s BAe-146 air tanker is described by the news reader and text on the screen (above) as having a “31,000 gallon tank”. That figure is off by a factor of 10 — they missed it by over 28,000 gallons. T41 can carry just under 3,000 gallons, maximum, and usually carries less due to density altitude limitations. If the 31,000 number was meant to be pounds instead of gallons, at 9 pounds per gallon for retardant it would still overstate the capacity by at least 400 gallons.
The air tankers that come closest to carrying 31,000 gallons are the 747 with 20,000 gallons, and the DC-10 at 11,600 gallons. All of the others flying today have a capacity of 3,000 gallons or less. The P2Vs usually carry less than 2,000. Coulson’s C-130Q that was awarded a contract this week will always carry 3,500 gallons when it begins dropping on fires in a few months.
The video shows T41 dropping on the Powerhouse Fire north of Los Angeles. The second time they show the drop near the end of the video, the news reader did not mention how the volume of the retardant trailed off at the end. The two BAe-146s have been criticized for having a consistent drop pattern for only the first 2,400 to 2,500 gallons, while the remaining 500 to 600 gallons dribbles out. Neptune has said they are outfitting their third and fourth BAe-146s this summer with an improved tank design which will fix some of the bugs with the tanking system. Then next winter they will modify the tanks in the first two BAe-146s, T40 and T41.
I watched some of the aerial firefighting Thursday while it was being streamed live, and saw an air tanker drop unlike any I have seen before. The same air tanker, T41, made two separate drops on the same pass. The ridgetop target was not straight. It had two straight sections but had an oxbow in the middle. The ridge was too crooked for the aircraft to make two sharp turns and treat the entire ridge in one long drop, so it flew a straight line and dropped maybe 1,000 gallons on the first straight section, stopped dropping while it passed by the crooked section of ridgetop, then when it was over the second straight section, opened the doors again and dropped another 1,000 gallons or so. Either T41 or another air tanker probably came back later and treated the oxbow section skipped before.