jgracin,
As requested, a few Flap15° Takeoff speeds for the B777 to play with. The B777-200ER and B777-300 are the RR Trent 884 and 892 respectively, the B777-300ER speeds are for the GE90-115BL engines.
FLAPS 15 V1 / Vr / V2 SPEEDS FOR MAX TAKEOFF THRUST
WEIGHT: B777-200ER: B777-300 : B777-300ER
TONNES
380 : ---/---/--- : ---/---/--- : 175/184/190
370 : ---/---/--- : ---/---/--- : 172/181/187
360 : ---/---/--- : ---/---/--- : 170/179/185
350 : ---/---/--- : ---/---/--- : 167/176/183
340 : ---/---/--- : ---/---/--- : 165/174/181
330 : ---/---/--- : ---/---/--- : 162/171/179
320 : ---/---/--- : 174/183/187 : 160/168/177
310 : ---/---/--- : 170/179/184 : 157/165/174
300 : 159/163/168 : 167/176/182 : 154/162/172
290 : 156/160/165 : 163/173/179 : 151/158/169
280 : 153/157/162 : 160/169/176 : 148/155/167
270 : 150/154/160 : 157/166/173 : 145/152/164
260 : 146/151/157 : 153/163/171 : 142/149/162
250 : 143/147/154 : 149/159/168 : 138/145/159
240 : 139/144/151 : 146/156/165 : 134/142/156
230 : 135/140/148 : 142/152/162 : 130/138/153
220 : 132/137/145 : 137/148/158 : 126/134/151
210 : 128/133/142 : 133/144/155 : 121/130/148
200 : 124/129/139 : 129/140/152 : 117/127/145
Below 200,000 Kg, who cares!
WARNING! - These speeds are for Dry Runway at Full Takeoff Thrust, Derates, Pressure Height, Slope, Clearway, Stopway, contamination (ad nauseum) are
NOT considered....
Mutt, Airline policy is all-pervading in favour of favouring continued Takeoff Vs Accelerate-Stop, the lower Flaps 15° V speeds ensure earlier achievement of V1, even at the expense of Higher Assumed temperatures to achieve the requisite climb/obstacle performance. We only carry airport analysis for Flaps 5° where some advantage in increased weights may apply, and don't carry Flaps 20° data at all.
This is not to say that I agree with it, as I've said before, I fly the B777 but do P/E work for other aircraft. For the aircraft that I do the work for and write operational policy, the instruction is to use the flap setting conferring the highest RTOW, even if the actual weight is well below the limits for all of the available flap settings. (T'is one of the nice things about having sole autonomy in dictating the operation
).
Regards,
Old Smokey