Within the Aircraft.cfg and/or Air File, is there a way to modify/replace a fixed pitch prop with a constant speed prop? If so, what text needs to be modified?I fear that this may be part of the aircraft model and cannot be modified, but if it can, I sure would appreciate a little information on how to make this modification.Thanks:RTH

From the default C172's aircraft.cfg:

[propeller]thrust_scalar = 1.0                 			//Propeller thrust scalarpropeller_type= 1                   			//0=Constant Speed, 1=Fixed Pitchpropeller_diameter= 6.3             			//Propeller Diameter, (feet)propeller_blades= 2                 			//Number of propeller bladespropeller_moi= 5.0                          	//Propeller moment of inertiabeta_max= 0                         			//Maximum blade pitch angle for constant speed prop, (degrees)beta_min= 0                         			//Minimum blade pitch angle for constant speed prop, (degrees)min_gov_rpm= 0                              	//Miminum governed RPMprop_tc= 0                                  	//Prop time-constantgear_reduction_ratio= 1.0           			//Propeller gear reduction ratiofixed_pitch_beta= 20                        	//Fixed pitch angle of fixed pitch prop, (degrees)low_speed_theory_limit= 80                  	//Speed at which low speed theory becomes blended in (feet/second)prop_sync_available= 0                      	//Prop synchronization available? 0=FALSE, 1=TRUEprop_deice_available= 0             			//Prop de-icing available? 0=FALSE, 1=TRUEprop_feathering_available= 0                	//Prop feathering available?  0=FALSE, 1=TRUEprop_auto_feathering_available= 0   			//Prop auto-feathering available?  0=FALSE, 1=TRUEmin_rpm_for_feather= 0                      	//Minimum RPM for prop featheringbeta_feather= 0                     			//Feathering pitch angle (degrees)power_absorbed_cf= 0                        	//Coefficient of friction for power absorbed by propellerdefeathering_accumulators_available= 0      	//Defeathering accumulators available? 0=FALSE, 1=TRUE prop_reverse_available= 0           			//Prop reverse available?  0=FALSE, 1=TRUEminimum_on_ground_beta= 0           			//Miminum pitch angle on ground, (degrees)minimum_reverse_beta= 0             			//Minimum pitch angle in reverse, (degrees)

Compare with the C182:

[propeller]thrust_scalar = 1.0                         	//Propeller thrust scalarpropeller_type= 0                           	//0=Constant Speed, 1=Fixed Pitchpropeller_diameter= 6.58                    	//Propeller Diameter, (feet)propeller_blades= 3                         	//Number of propeller bladespropeller_moi= 8.3                          	//Propeller moment of inertiabeta_max= 31.7                              	//Maximum blade pitch angle for constant speed prop, (degrees)beta_min= 14.9                              	//Minimum blade pitch angle for constant speed prop, (degrees)min_gov_rpm= 1400                           	//Miminum governed RPMprop_tc= 0.1                                	//Prop time-constantgear_reduction_ratio= 1.0                   	//Propeller gear reduction ratiofixed_pitch_beta= 20                        	//Fixed pitch angle of fixed pitch prop, (degrees)low_speed_theory_limit= 80                  	//Speed at which low speed theory becomes blended in (feet/second)prop_sync_available= 0                      	//Prop synchronization available? 0=FALSE, 1=TRUEprop_deice_available= 0                     	//Prop de-icing available? 0=FALSE, 1=TRUEprop_feathering_available= 0                	//Prop feathering available?  0=FALSE, 1=TRUEprop_auto_feathering_available= 0           	//Prop auto-feathering available?  0=FALSE, 1=TRUEmin_rpm_for_feather= 0                      	//Minimum RPM for prop featheringbeta_feather= 0                             	//Feathering pitch angle (degrees)power_absorbed_cf= 0                        	//Coefficient of friction for power absorbed by propellerdefeathering_accumulators_available= 0      	//Defeathering accumulators available? 0=FALSE, 1=TRUE prop_reverse_available= 0                   	//Prop reverse available?  0=FALSE, 1=TRUEminimum_on_ground_beta= 0                   	//Miminum pitch angle on ground, (degrees)minimum_reverse_beta= 0                     	//Minimum pitch angle in reverse, (degrees)

I don't know if the .air file plays a role too.

Thanks Jeroen!So simple I overlooked it.Changing "propeller_Type=1" to "propeller_Type=0" did the trick.Happy flying:RTH