PP not even spaceship1 uses this configuration to create a auto-stable decent, a lot of free flown modells uses this as save thermal-brake since a long time
(1967)
released with a glimm-rope or a smal timer the horizontal stabilisator moved up after some minutes, and the following flight path is very stable with not to much downspeed,
the model sinks faster than the updraft thermik may be and landed without high-speed-chrash on earth........
if a trim +13deg for an a330 seems very stable for 45° angle of decent....
can it be that today some pilot did not know (learn) the trim value for a stable glide with 3° or 4° angle of decent? is the understanding of the aerodynamic mechanism of an auto-stable flow (glide) no longer notable fore every pilot?
trim, position of CG.....is today every basic thing out of mind?
every pilot has to build and flow free flow models before he learn to control computers