It would be helpful to see the effects section of the aircraft xdp file that is having the contrails on all the time.
There are some older versions of the contrail effect that were speed dependent.
There may also be a name conflict within the effects.xml that might be interfering.
Thanks for the reply!
here is the aircraft.xdp (hurri mk2a)
<Effects>
<Effect Type="Track" EffectName="fx_ac_Light_formation_yellow" PosX="0" PosZ="-2.32" PosY="0.77" MinVel="1" MaxVel="60"></Effect>
<Effect Type="Track" EffectName="fx_ac_Light_formation_yellow" PosX="0" PosZ="-2.24" PosY="-0.75" MinVel="1" MaxVel="60"></Effect>
<Effect Type="Track" EffectName="fx_ac_Light_nav_green" PosX="5.74" PosZ="0.4" PosY="-0.33" MinVel="1" MaxVel="60"></Effect>
<Effect Type="Track" EffectName="fx_ac_Light_nav_red" PosX="-5.74" PosZ="0.4" PosY="-0.33" MinVel="1" MaxVel="60"></Effect>
<Effect Type="Track" EffectName="fx_ac_Light_landing" PosX="-3.11" PosZ="0.68" PosY="-0.47" MinVel="1" MaxVel="55"></Effect>
<Effect Type="Track" EffectName="fx_ac_Light_landing" PosX="3.11" PosZ="0.68" PosY="-0.47" MinVel="1" MaxVel="55"></Effect>
<Effect Type="Track" EffectName="fx_ac_Light_landing_effect" PosX="-3.11" PosZ="0.68" PosY="-0.47" MinVel="1" MaxVel="52"></Effect>
<Effect Type="Track" EffectName="fx_ac_Light_landing_effect" PosX="3.11" PosZ="0.68" PosY="-0.47" MinVel="1" MaxVel="52"></Effect>
<Effect Type="Track" EffectName="fx_N_gtrail" PosX="-6.1" PosZ="-0.6" PosY="-0.32" MinVel="39" MaxVel="55"></Effect>
<Effect Type="Track" EffectName="fx_N_gtrail" PosX="6.1" PosZ="-0.6" PosY="-0.32" MinVel="39" MaxVel="55"></Effect>
<Effect Type="Track" EffectName="fx_N_gtrail" PosX="-6.1" PosZ="-0.6" PosY="-0.32" MinVel="80" MaxVel="82"></Effect>
<Effect Type="Track" EffectName="fx_N_gtrail" PosX="6.1" PosZ="-0.6" PosY="-0.32" MinVel="80" MaxVel="82"></Effect>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" Location="emitter_eng0_exh_r"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" Location="emitter_eng0_exh_r_1"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" Location="emitter_eng0_exh_r_2"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" Location="emitter_eng0_exh_l"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" Location="emitter_eng0_exh_l_1"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" Location="emitter_eng0_exh_l_2"/>
<Effect Type="StartEngine0" EffectName="fx_engstrt" Location="emitter_eng0_exh_r"></Effect>
<Effect Type="StartEngine0" EffectName="fx_engstrt" Location="emitter_eng0_exh_r_1"></Effect>
<Effect Type="StartEngine0" EffectName="fx_engstrt" Location="emitter_eng0_exh_r_2"></Effect>
<Effect Type="StartEngine0" EffectName="fx_engstrt" Location="emitter_eng0_exh_l"></Effect>
<Effect Type="StartEngine0" EffectName="fx_engstrt" Location="emitter_eng0_exh_l_1"></Effect>
<Effect Type="StartEngine0" EffectName="fx_engstrt" Location="emitter_eng0_exh_l_2"></Effect>
<Effect Type="Shells0" EffectName="fx_shells_s" Location="emitter_shell_l_0"></Effect>
<Effect Type="Shells1" EffectName="fx_shells_s" Location="emitter_shell_l_1"></Effect>
<Effect Type="Shells2" EffectName="fx_shells_s" Location="emitter_shell_l_2"></Effect>
<Effect Type="Shells3" EffectName="fx_shells_s" Location="emitter_shell_l_3"></Effect>
<Effect Type="Shells6" EffectName="fx_shells_s" Location="emitter_shell_r_0"></Effect>
<Effect Type="Shells7" EffectName="fx_shells_s" Location="emitter_shell_r_1"></Effect>
<Effect Type="Shells8" EffectName="fx_shells_s" Location="emitter_shell_r_2"></Effect>
<Effect Type="Shells9" EffectName="fx_shells_s" Location="emitter_shell_r_3"></Effect>
<Effect Type="Track" EffectName="fx_high_contrail" Location="emitter_eng0_exh_l"/>
<Effect Type="Track" EffectName="fx_high_contrail" Location="emitter_eng0_exh_r"/>
</Effects>