I think I have found the solution by replacing the propeller portion of the aircraft.cfg with the following lines using note pad.
[propeller]
propeller_type=0
propeller_diameter=6.666667
propeller_blades=3
propeller_moi=7.777778
beta_max=34.000000
beta_min=15.000000
min_gov_rpm=1400.000000
prop_tc=0.100000
gear_reduction_ratio=1.000000
fixed_pitch_beta=20.000000
low_speed_theory_limit=8.000000
prop_sync_available=0
prop_deice_available=0
prop_feathering_available=0
prop_auto_feathering_available=0
min_rpm_for_feather=0.000000
beta_feather=0.000000
power_absorbed_cf=0.000000
defeathering_accumulators_available=0
prop_reverse_available=0
minimum_on_ground_beta=0.000000
minimum_reverse_beta=0.000000
rotation= -1,1 //Engine 1,2,3,... Rotation direction. 1 = CW, -1 = CCW
