A little clearification about the functions of Auto-Pilot and Trim #5

World War One - there was a existing form of Autopilot, that depended on Magnets and pullies, as most of these Birds had NO electrical system, outside of a switch for the engine magneto. But if not set-up right you'd find yourself in an unfriendly country if your petrol lasted that long. And it was much too expensive to install in an aircraft bound for battle.

[EDIT Polovski: Autopilot works fine in OFF Uncleal, CTRL+ALT+A. This is a level flight AND HEADING autopilot, although technically it doesn't exist in WW1 of course See FAQ.]

PS . . some British pilots, late in the war, had battery powered map reading lights

Auto-Trim . . While some find these Birds difficult to fly, it was their very unstableness that separated each one from the next. There was NO Auto Trim on any aircraft. But there's been conflicting reports, of Pilot Controlled Elevator Trim on the SE5a in 1918
And if you nose around cockpit of a Sopwith Triplane, under the seat you'll find an elevator trim adjustment wheel. Unknown if the pilot could reach it in flight
Some aircraft had Grounds Crew adjustable trim, on reports of flight manners, from the pilot.
Some had no adjustabilty period
Judgement call on it's use

In real life pilots would take her up for a short flight, just so they could give instructions to the Grounds Crew. It might take 2 or 3 of such short flights, to get everything dailed in.

That Picture of the Young Officer, reporting for duty, on the Flight Line . . . is pure Hollywood

To be fair, I'd say trim once, at the start of the flight, then hands off

Some use Auto-Trim as a sort of Autopilot. You still need to be there, but you can read a book, glancing at the moritor now and then. Not Holding the Joystick
Best done at 17,000 . . where chances of being 'disturbed' are less