On Tue, 8 Aug 2006, Lee Elliott wrote:
Thanks for posting this observation - this is clearly a bit wacky
(not that accelerating w/o +energy wasn't) - can you reproduce
it?
Now that I tested it again, I saw however that the FF number didn't fall
over from a high number to a negative, but decreased to zero first. Same
goes for N1. But it happens quite suddenly.
KSFO "Fair weather", Noon. 2D mini-panel on. Full throttle (no AB, no flaps
or slats). Take-off. Gear up and climb to 1000'. Bank 90° and pull the
stick all the way back. After a while the engine sound suddenly changes to
a low thunder and not only FF goes negative, but so does N1 and EGT. (I
don't think N2 did though) Tank fills up and overfills quickly. FF is
*very* negative. The number runs off-screeen. If you get too much altitude
the phenomenon stops. Stay low; below 5000', at 1000'
or so ...without crashing into anything -- which isn't that easy to avoid in
70G mach 3 turns. If you ease off throttle, you get the reported phenomenon
with insane speed instead. (mach 8 and 300G). AoA seems to stay at about
16°.
Apparently the "magical energy" doesn't come from increased mass -- FF is
near zero (and positive) with zero throttle and mass doesn't increase. My
guess is that this is a bug in the yasim jet engine code somewhere. One of
these one-liners that are so hard to find. ;) But at least it's easy to
reproduce.
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