On Dec 7, 8:41*am, wrote:

I guess that the heat problem on the tail will clearly appear with the
new engine (twice the thrust of the actual one)

Not necessarily. I'd guess most of the additional static thrust comes
from the fan, rather than a bigger core. This would be likely since
the absolute fuel consumption supposedly is unchanged, which means the
amount of heat energy produced in combustion is more or less
unchanged. With the bigger fan (does the original engine even have a
fan, or is it a straight turbojet?) you might actually get lower temps
due to the mixing of cooler bypass air after the turbine section. In
any event I'm guessing the Hph engineers are aware of what the
temperature parameters are as a melty-tail sailplane would not likely
pass certification. It would be fun to watch though...

9B