I can not control flight speed

I am using px4 autopilot with gazebo. I am setting flight speed of waypoints but when mission started speed stay about 10-15m/s. How can I solve this problem?

Try via parameter MPC_XY_CRUISE and MPC_XY_VEL_MAX

MPC_XY_CRUISE parameter is 5m/s but MPC_XY_VEL_MAX parameter does not exist. Also I am using advanced plane model.

Ah, for fixedwing, look into the FW_ params