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B77X

777-300ER speeds not close at light weights

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Calculated speeds in the calculator tool are not close to what the FMC shows. v speeds are more than 10 knots different than the FMC's calculations. At light weights every calculation even TO2 is a selected temp of 70c. That is not right.

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On 6/26/2020 at 9:52 AM, B77X said:

Calculated speeds in the calculator tool are not close to what the FMC shows. v speeds are more than 10 knots different than the FMC's calculations. At light weights every calculation even TO2 is a selected temp of 70c. That is not right.

Hello,
the v-speeds are increased with the rise of the assumed temperature, that is probably the reason for the difference in speeds.
When it comes to high sel. temp., you can try taking off at a shorter runway which has higher altitude.
-300ER has huge engines with a lot of thrust

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On 7/18/2020 at 12:05 AM, nixdevelopment said:

Hello,
the v-speeds are increased with the rise of the assumed temperature, that is probably the reason for the difference in speeds.
When it comes to high sel. temp., you can try taking off at a shorter runway which has higher altitude.
-300ER has huge engines with a log of thrust

Hi when I use a different takeoff calculator program for the more powerful 200LR/LRF I have a different variety of numbers that match the FMC. But at light weights I do not see this in the 300ER using your calculator.

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