Originally Posted by pigboat
I believe most RR Dart powered aircraft used water/methanol injection to either restore or boost engine power in hot/high operations. The RR Dart Mk529 was an example of a restored power engine while the Mk532 was a boosted engine. The Fairchild/Fokker F-27 series of aircraft as well as the Gulfstream G159 used water meth injection.
From the Fairchild manual:
Gulfstream says essentially the same thing
The correct mixture for the above is critical. It is 63% +/- 1% of water and 37% +/- 1% of methanol by volume. W/M is extremely corrosive, so if you have to handle it personal protective devices are essential.
The Nihon YS-11 which I flew used the Dart and indeed did use water injection.
Once you got the Dart started, you 'trimmed' it up with small toggle switches on the center console. You were provided with wet and dry data in the summer days. As part of your flight kit, since the YS-11 had such poor ventilation and air conditioning, you carried a small towel to wipe the sweat from your brow after a few flights But then (being parochial and partial to cold beer) it did make the afternoon brew even more enjoyable.