Ever wondered why for years, many engine manufacturers deliberately injected water into their engines in the form of Water-Methanol?
Aha! Because it increases power
(For all the good reasons that earlier posters have indicated).
I have memories from my earlier flying career with RR Darts with Water injection, a "Wet" takeoff on an Australian 45°C day, upon turning the W/M off at 400 feet, it seemed like the engines had stopped, RPM would initially drop considerably, until the prop CSU restored set RPM. A jet, of course, has no such speed governor, and the RPM would stay dropped.
Regards,
Old Smokey