Greetings,As the topic says can I do these calculations without using Topcat?I'm more interested in the assumed temperature and N1 derate as I know the V speeds can be done using the FMCTopcat was used in tutorial 2 and Ryan stated it was an option.I know the performance charts are in the FCOM Vol 1 but I have absolutely no idea where to start.Can anyone help?Pretty pleeeease!Thank you.

Yeah, I'm very interested in this question as well.

Does Israels' tool not give this data?

Normally in flight manuals they show you an example. I'd suggest looking in the pages before and after the chart for the example. I know in the 727 manuals, they show the example on the second chart, not the first one (I guess flap 15 takeoffs were more common, so they showed it there instead of on the flap 5).If I had them here with me, I'd draft something up, but I don't have them in front of me.

I'm more interested in the assumed temperature and N1 derate as I know the V speeds can be done using the FMC

Lets take a stab at this. Lets say for example that the OAT is 15C and the PA is SL. Go to page PI.10.14 in the FCOM V1. This page is for the 600 model assumed temp.Enter Table 1(maximum assumed temp)at 15C and a PA of 0, the max assumed temp is 61C.Next move on to Table 2(takeoff N1)Use an assumed temp up too but not greater than the max temp from table 1(61C)lets use 50C. 50C and 0 PA gives an N1 of 90.4Next subtract the OAT(15C) from the assumed temp used(50C). This gives us 35C.Now enter table 3(N1 adjustment for temp difference) with 35C. 35C and SL puts us between 4.6 and 5.9.math puts us at 5.25. You can also be conservative and round down to 4.6.Last step is to take 5.25, and subtract it from 90.4= which rounds to 85.2Now in the current and previous aircraft i flew, you will use the assumed temp to calculate/adjust V speeds.The only issue now is knowing if you can still make the required/minimum climb gradients with the reduction. There are no charts to calculate this.I don't fly the 737, so this is my best guess at calculating the assumed temps reading the charts.Also, don't forget to make adjustments for bleeds when required.

I use TOPCAT on all my flights and find it pretty accurate when comparing the data from it and the end result in the FMC.I find that you can set up the W & B in TOPCAT Manaully but I tend to skip that part as I don't read nor write to the aircraft's .cfgSo you load your fuel and payload in the FMC and it goives you your gross weight,I then go to the Take-Off page in TOPCAT and enter my GW wieght into the Take-Off Weight box e.g if my GW is 68.8 I would put 68800 in the box.I then put in the Departure ICAO into the Airport box and update the weather via Active Sky and TOPCAT will give the RWY and winds / QNH etc etc.I then set Optimum for both FLAP and THRUST,I use Air Conditioning ON and Anti-Ice OFF on most of my Australia flights but this varies in other areas.Then hit the compute button.Here is my Assumed Temperature and Reduced Thrust setting for the flight I'm doing at as I type.TAKE-OFF YPPD/PHE RWY 14 TORA 8202FT PMDG NGX BOEING 737-800 CFM56-7B26PORT HEDLAND TEMP +25C QNH 999 WIND 110/22 (19KT HW)------------------ CONDITIONS ------------------- ** FLAPS 1 ** TO2 ** DRY ** ** AIR COND ON ** ANTI ICE OFF ** ASSUMED TAKE-OFF WEIGHT 60807 KG ------------------ FULL THRUST ------------------- +25C 71116 FIELD 139-140 140 148 2340FT 93.3%---------------- REDUCED THRUST ----------------- +42C 63412 CLIMB 142 142 147 974FT 90.8% +43C 62808 CLIMB 142-143 143 147 864FT 90.7% +44C 62211 CLIMB 142-143 143 146 743FT 90.5% +45C 61616 CLIMB 142-143 143 146 620FT 90.4%//+46C 61021 CLIMB 142 143 146 494FT 90.2% +47C NOT AUTH +48C NOT AUTH***************************************************DO NOT EXCEED MAX STRUCT TAKE-OFF WGHT OF 78471 KG***************************************************As you can see I have taken off using FLAPS 1 and TO2 with an assumed temperature of 46 degrees which gave me a 90.2% thrust rating.When I select TO2 and enter 46 degrees into the FMC it says the thrust will be set at 90.4% so its pretty close for me :)If you set up TOPCAT like in the Tut #2 and follow the above you should be on the right track.Good luck.

Adam, the topic name is "Takeoff performance calculation without Topcat".

Pretty simple, what you are looking for is the FPPM. google it ! can't give you a link since Ryan said its not authorized round here.