Gday Centaurus,
I have had this argument recently. I too beleive that it is incorrect to use the speeds associated with the actual OAT. You are in effect performing an "improved climb" take off with out the certified "imp clmb" data.
Further, certification data for the second segment is predicated at V2, which is entirely related to Vs, not assumed or actual OAT.
In my view, if you go rated thrust then you must use the speeds for the weight.
Any others care to comment??
Cheers,
Contract Con
P.s If it does say in the preamble in your RTOW, as written by the boffin that came up with all the numbers, to use the speeds for the actual OAT, then you may have no choice, regardless of opinion. The RTOW is an official certified doc. approved by your states regulator. If you go outside of what is written, you may end up in a sticky situation,in court with some smart ass lawyer, after it all goes bad one afternoon
