In article , Peter
R. wrote:

The Bonanza is a slippery (read "clean") airframe. It will pick up
speed quickly if you are not paying attention, possibly getting you
high into the yellow or even the red arcs before you notice it.

Yes, the owner also mentioned this issue. This does concern me a bit,
given my low level of experience and once-in-a-while tendency to fixate
when I scan. I will certainly work with the instructor on hand flying in
IMC and I expect that I won't be on my own in IMC for several tens of
hours.

Is it even possible to practice downward unusual attitudes with this
aircraft?

Slow down before you begin the maneuver.
Putting the gear down is another method to keep the airspeed from
building quickly.
The Bonanza has a high Vge. Depending on the model, it can be as high
as high as 135 kts.