Trident & 1-11 Thrust Setting for Takeoff
Posted: 28 Oct 2014, 11:51
Morning,
I have been flying the Trident and 1-11 extensively over the past few years, and have always used the method of 100% on the Thrust Index gauges, EGT out of the Red (600c) as my power setting for takeoff.
Now, I was reading somewhere (it escapes me exactly where) that there were actually two power settings used for takeoff - Max Power and a slightly derated setting - possibly called 511 Power? I assume this was simply to reduce TGT and maintenance costs, and that it was calculated from tables in the performance manuals.
Being the OC type, I like to fly as realistically as I can (within the obvious confines of the sim), and would like to try and find out a bit more about this procedure. Unfortunately, the Royal Archives are a bit inconvenient to visit to consult the real world Trident documentation so I was wondering if there was a rule of thumb I could use to obtain a derate - assuming that it was simply a reduction applied to the Maximum Power Thrust Index for the given ambient conditions? Or was it a reduction in the allowable TGT for takeoff? Conversely, where Water Injection was used in limiting conditions can the Thrust Index be wound forward by an equivalent amount to still produce 100% Thrust and remain within the TGT limit?
One more thing - I have always used 11900rpm as the climb power setting for both Trident and 1-11; is this correct or would 11800rpm be more suitable? I know it's not a huge difference but if you are going to do it - then do it right I say!
Cheers for any help you guys can offer.
Tom
I have been flying the Trident and 1-11 extensively over the past few years, and have always used the method of 100% on the Thrust Index gauges, EGT out of the Red (600c) as my power setting for takeoff.
Now, I was reading somewhere (it escapes me exactly where) that there were actually two power settings used for takeoff - Max Power and a slightly derated setting - possibly called 511 Power? I assume this was simply to reduce TGT and maintenance costs, and that it was calculated from tables in the performance manuals.
Being the OC type, I like to fly as realistically as I can (within the obvious confines of the sim), and would like to try and find out a bit more about this procedure. Unfortunately, the Royal Archives are a bit inconvenient to visit to consult the real world Trident documentation so I was wondering if there was a rule of thumb I could use to obtain a derate - assuming that it was simply a reduction applied to the Maximum Power Thrust Index for the given ambient conditions? Or was it a reduction in the allowable TGT for takeoff? Conversely, where Water Injection was used in limiting conditions can the Thrust Index be wound forward by an equivalent amount to still produce 100% Thrust and remain within the TGT limit?
One more thing - I have always used 11900rpm as the climb power setting for both Trident and 1-11; is this correct or would 11800rpm be more suitable? I know it's not a huge difference but if you are going to do it - then do it right I say!
Cheers for any help you guys can offer.
Tom