diff --git a/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert b/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert
index ee5ea9401c..eac28c8cdb 100644
--- a/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert
+++ b/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert
@@ -37,7 +37,10 @@ param set-default SIH_IYY 0.000625
 param set-default SIH_IZZ 0.00300
 param set-default SIH_IXZ 0
 param set-default SIH_KDV 0.2
-param set-default SIH_L_ROLL 0.145
+
+# SIH_L_ROLL = CA_ROTOR0_PX. this is redundant, should in future use CA rotor
+# geometry info in sih...
+param set-default SIH_L_ROLL 1
 
 # sih as tailsitter
 param set-default SIH_VEHICLE_TYPE 2
diff --git a/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil b/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil
index e033c1a4b6..956d776b39 100644
--- a/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil
+++ b/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil
@@ -75,7 +75,10 @@ param set SIH_IYY 0.000625
 param set SIH_IZZ 0.00300
 param set SIH_IXZ 0
 param set SIH_KDV 0.2
-param set SIH_L_ROLL 0.145
+
+# SIH_L_ROLL = CA_ROTOR0_PX. this is redundant, should in future use CA rotor
+# geometry info in sih...
+param set SIH_L_ROLL 1
 
 # sih as tailsitter
 param set SIH_VEHICLE_TYPE 2