Coffin corner - is it better to descend on the fast side?

[Flash131]

The 20 second dive plus 1.5g pull-up may not have been flown before. The rules allow the design dive speed to be established from a ‘rational analysis’ of this manoeuvre. There is no requirement to demonstrate it in flight test.

See the excellent summary in this post:

http://www.pprune.org/tech-log/254943-demonstrated-design-dive-speed-vdf.html#post3002448

If you pull 1.5g at VD or MD, you might be the first to do so.