If you would like to stop the tailskid bouncing while on the ground, here are a few lines of text to replace the existing lines in your flight_model.cfg file, [CONTACT_POINTS] section:
static_pitch =14.206
static_cg_height =4.210
point.0 = 1, -13.080, 0.00, -1.5, 500, 0, 1.000, 90, 0.50, 2, 0.50, 0, 0, 0, 0, 0, 1.0
point.1 = 1, 1.191, -2.55, -5.2, 750, 0, 1.192, 0, 0.55, 2, 0.55, 0, 0, 2, 0 ,0, 1.1
point.2 = 1, 1.191, 2.55, -5.2, 750, 0, 1.192, 0, 0.55, 2, 0.55, 0, 0, 3, 0, 0, 1.1
**** BACK UP YOUR EXISTING FLIGHT_MODEL.CFG FIRST!! ****
If you would also like to stop the plane creeping forward at tickover on the ground, these lines will reduce the tickover rpm only. Again, replace the existing lines in your engines.cfg [PISTON_ENGINE] section:
engine_mechanical_efficiency_table=0:0.6, 400:0.65, 700:0.72, 1100:0.72, 1350:0.65
engine_friction_table=-300:-20, 300:17, 500:20, 1000:20, 1200:25, 1400:30
manifold_efficiency_table=0:0.28, 1:0.99
**** BACK UP YOUR EXISTING ENGINES.CFG FIRST!! ****