Dang you make a guy think! I wish you had been with us when we purchased the drone. My son, Tyler, has been handling this project. I built the tender as my skill set is more welder and sledge hammer whereas Tyler's is more technology related.

I may have misspoke when I said it has flow meters. IIRC we were told it has multiple pumps that are a constant volume. Similar to a roller pump, each revolution of the pump outputs a specific volume that doesn't change. As the drone changes speed it varies the speed the pump puts out by controlling the speed at which the pump turns.