The A/C in question is a Grob 109, it's a taildragger so a curved approach is appropriate really thinking about it.
www.military-airshows.co.uk/ abingdon2005/1750.jpg
To clarify what I learned i'll go through a basic circuit as is remember it, from 1998 ish as it might have changed, and my point is how it is simpler than a PPL style circuit.
All heights in QFE, and ignore the fact you actually "glide".
Take off and climb at 60kts straight out to 800ft (ROC 400fpm) "Pause" I was told a few times!
Level at 800ft, 60kts. Turn at about 15-20*AOB until downwind (also a constant turn). Maintain 60kts, 800ft until mid point downwind. Now A.P.T. reduce power to idle and maintain 60 kts in the glide, still on downwind.
As the piano keys meet the leading edge increase to approach speed 65-70kts in the glide, usually at 700' by this stage. Still on downwind.
As piano keys come out under trailing edge start turn at about 15-20* AOB.
Halfway round you should be at about 500' (Still air).
Roll out on finals at about 300' still having maintained approach speed. Land.
Joining was either 45* into downwind at cct height, or 90* to the upwind piano keys if you were engine off. (although at 900')
Basically the point I am trying to make is you are climbing, turning then descending steadily but not all at the same time. You have broken it down into little bits.
I can't help but think that the young lad down south in the Cessna 150 who died last week could have been trying to do more than one thing at once, forgot about airspeed then it got away from him. Maybe tightening the turn to stay square. Incidentally I was also 16 and had about 10 hours on my subsequent solos, which is what got me thinking about base final turns.
As for EFATO's well turn back from 300', or fly a mini cct at 500'. (As you can tell i loved that plane
.