If the 'fix' your looking for is making the rear wheel steerable, open the aircraft.cfg and scroll down to this line.....(I know this is 'cheating', but not being a diehard purist, I find it makes flying these a/c less frustrating).
[contact_points]
point.0=1, -56.00, 0.0, -2.3, 1200.0, 0, 0.60,
00.0
, 0.200, 2.5, 0.695, 0.0, 0.0, 0.0, 0.0, 0.0
Edit the blue highlighted number, the steering angle, to read as below.
[contact_points]
point.0=1, -56.00, 0.0, -2.3, 1200.0, 0, 0.60,
48.0
, 0.200, 2.5, 0.695, 0.0, 0.0, 0.0, 0.0, 0.0
You can experiment with the number, but I find something in the 40's works best. This fix works for any of the castored (non steerable rear wheel) a/c, such as the piper or tri-motor.
As always it is safest to back up any file before editing.
Cheers,
Dave