Use of TOGA with Flex speeds

[Gutter Airways]

Thank you for the input guys.

Like nitpicker330, I also ran a couple of calculations through the LPC yesterday.

These are the results I got. It should be noted, these results are based on a TORA of 3500m, sea-level, and an airfield without any high obstacles or terrain, ISA temperature and a QNH of 1004. I am mentioning this, incase it is of significance in analysing the results.

The Flex calculation gave the following speeds:

Flex 57
V1: 152
V2: 152
VR: 154

(min V1 - 152, min V2 - 120, Vmcg - 113)

TOGA gave the following speeds:

V1: 141
V2: 142
VR: 145

(min V1 - 120, min V2 - 120, Vmcg - 113)

Whilst I understand the logic of reaching the Flex V1 speed sooner on the runway with TOGA thrust, hence greater remaining stopping distance, I would like to ask about the decision to stop or go. It would seem you could end up in a situation, with TOGA thrust but Flex speeds, where you stop above what would be the normal V1 for that thrust setting. Any comments on this?

Secondly, I do not understand why the minimum V1 is so high for the Flex calculation.

Thank you once again for your insight.