[F4U-1_Corsair]

it is inside the telescope, so that you can look at your target and slip without moving your head.

the slip was expecially important because in dives your tourque really runs away, in fact, in a near vertical dive, your slip indicator will often be thrown all the way to the left or right.

this is how I remember the telescope I saw.



unlike yours, it also had the cross-hairs at the end away from the eye, so that if your eye wasn't dead center, it wouldn't move in your perspective very much.

lastly, as you said "As sim pilots we sometimes neglect the importance of trimming the aircraft, My Dad told me that during flight training this was a major topic."

this is very true. in fact, most people almost never trim their planes in combat. If anywhere, it is here that the trim is most important. In a F4U, properly trimmed I can out run untrimmed planes that are generally considered faster. In fact, you also can get rid of the supposed AI advantage in speed. they arn't faster, just trimmed!

this also stops the supposed p47 lack of dive ability. It, like the corsair, just has a lot of tourque in a dive, that causes it to yaw a lot at high speed. if trimmed, you will often find that you have to sometimes worry about going right past that Bf109 you were previously behind.