Hi,

@Lou: I thought you added half the steady and all of the gust?

e.g. 250@15G30, add 7.5+15 = +23 kts to Vth? IIRC max. correction is 20 kts, so it would be Vth + 20.

I'm trying to find some data I used to have on 707 perf.

Best regards,
Robin.

Robin, you are correct!  :-[

It's been a while, but you would add the wind speed + 1/2 the gust to a max of 20kts.

Here is a quote from an AA pilot:
"AA uses the following formula:
"Approach speed = Vref + 1/2 Reported Wind + Gust.
Minimum approach speed = Vref +5.
Maximum approach speed = Vref +20."
(tailwind is always ignored)."

In the modern planes the Vref is figured by the computer.