diff --git a/Tools/autotest/default_params/copter-coax.parm b/Tools/autotest/default_params/copter-coax.parm
index 57fd4f1fc2..f1d51851e4 100644
--- a/Tools/autotest/default_params/copter-coax.parm
+++ b/Tools/autotest/default_params/copter-coax.parm
@@ -1,76 +1 @@
-BATT_MONITOR 4.0000
-COMPASS_OFS2_X 5.0000
-COMPASS_OFS2_Y 13.0000
-COMPASS_OFS2_Z -18.0000
-COMPASS_OFS3_X 1.0000
-COMPASS_OFS3_Y 1.0000
-COMPASS_OFS3_Z 1.0000
-COMPASS_OFS_X 2.8749
-COMPASS_OFS_Y -21.8262
-COMPASS_OFS_Z -21.8422
-FLTMODE1 7.0000
-FLTMODE2 9.0000
-FLTMODE3 6.0000
-FLTMODE4 3.0000
-FLTMODE5 5.0000
 FRAME_CLASS 9
-# we need small INS_ACC offsets so INS is recognised as being calibrated
-INS_ACCOFFS_X   0.001
-INS_ACCOFFS_Y   0.001
-INS_ACCOFFS_Z   0.001
-INS_ACCSCAL_X   1.001
-INS_ACCSCAL_Y   1.001
-INS_ACCSCAL_Z   1.001
-INS_ACC2OFFS_X   0.001
-INS_ACC2OFFS_Y   0.001
-INS_ACC2OFFS_Z   0.001
-INS_ACC2SCAL_X   1.001
-INS_ACC2SCAL_Y   1.001
-INS_ACC2SCAL_Z   1.001
-INS_ACC3OFFS_X   0.000
-INS_ACC3OFFS_Y   0.000
-INS_ACC3OFFS_Z   0.000
-INS_ACC3SCAL_X   1.000
-INS_ACC3SCAL_Y   1.000
-INS_ACC3SCAL_Z   1.000
-RC1_MAX         2000.000000
-RC1_MIN         1000.000000
-RC1_TRIM        1500.000000
-RC2_MAX         2000.000000
-RC2_MIN         1000.000000
-RC2_TRIM        1500.000000
-RC3_MAX         2000.000000
-RC3_MIN         1000.000000
-RC3_TRIM        1500.000000
-RC4_MAX         2000.000000
-RC4_MIN         1000.000000
-RC4_TRIM        1500.000000
-RC5_MAX         2000.000000
-RC5_MIN         1000.000000
-RC5_TRIM        1500.000000
-RC6_MAX         2000.000000
-RC6_MIN         1000.000000
-RC6_TRIM        1500.000000
-RC7_MAX         2000.000000
-RC7_MIN         1000.000000
-RC7_TRIM        1500.000000
-RC8_MAX         2000.000000
-RC8_MIN         1000.000000
-RC8_TRIM        1500.000000
-# autotune values
-ATC_RATE_FF_ENAB 1.000000
-ATC_RAT_PIT_D    0.200000
-ATC_RAT_PIT_FILT 20.000000
-ATC_RAT_PIT_I    2.000000
-ATC_RAT_PIT_IMAX 1.000000
-ATC_RAT_PIT_P    2.000000
-ATC_RAT_RLL_D    0.200000
-ATC_RAT_RLL_FILT 20.000000
-ATC_RAT_RLL_I    2.000000
-ATC_RAT_RLL_IMAX 1.000000
-ATC_RAT_RLL_P    2.000000
-ATC_RAT_YAW_D    0.000000
-ATC_RAT_YAW_FILT 5.000000
-ATC_RAT_YAW_I    0.139709
-ATC_RAT_YAW_IMAX 0.222000
-ATC_RAT_YAW_P    1.397085
diff --git a/Tools/autotest/pysim/vehicleinfo.py b/Tools/autotest/pysim/vehicleinfo.py
index 6ac9a25b4d..27044e00eb 100644
--- a/Tools/autotest/pysim/vehicleinfo.py
+++ b/Tools/autotest/pysim/vehicleinfo.py
@@ -102,7 +102,8 @@ class VehicleInfo(object):
             "coaxcopter": {
                 "make_target": "sitl",
                 "waf_target": "bin/arducopter",
-                "default_params_filename": "default_params/copter-coax.parm",
+                "default_params_filename": ["default_params/copter-single.parm",
+                                            "default_params/copter-coax.parm"],
             },
             "calibration": {
                 "extra_mavlink_cmds": "module load sitl_calibration;",