Depending on the mark, the Dart was either a restored or boosted power engine with the use of water meth. In either case water meth allowed takeoffs at higher gross weights because of the better single engine wet climb performance.
Operation was straightforward. You armed the system before adding power on takeoff, it cut in when the RPM reached a preset value and cut out when power was reduced below a preset RPM on climb. There was a time limit of five minutes at wet power on the engines I flew (Dart 529-7E/8E)
A typical mix would be 55% water to 45% methanol by volume.The stuff was highly corrosive and the pumps had to be kept submerged at all times. If you ran a tank dry and didn't refill it within a pescribed length of time, it meant a pump change. It was introduced into the engine via the second stage compressor, which was also where the air for the deicer boots was tapped. As a result, the deicer distribution valves could become contaminated. We always ran the boots a couple of cycles after every wet takeoff, just to clear the system.