I have calculated the performance/weight ratio of my Yak 50:
The empty weight of the RA2005K is 720 kg This is calculated: the original weight according to the aircraft's books is 750 kg; I replaced equipment and gained a measured 30 kg.
With a (heavy) pilot and full fuel plus oil, the total weight at takeoff is around 900 kg.
The engine is a 450 HP M14R, measured at 437 horsepower. When extrapolating the measured thrust data on a M14P (360 horsepower) and a M14PF (400 horsepower), this gives a thrust of about 990 kgf. I've taken Kevin Kimball's data, and I also use an MTV9-260-29 three-bladed prop.
So the thrust/weight ratio is 1.1
Hovering and climbing away is theoretically possible. But the ailerons of the Yak 50 are too short. When hanging on the prop, the aircraft always ends up in an inverted spin (torque wins ...).
Nevertheless, performance at takeoff is incredible. The Yak 50 barely rolls on the runway and it's already airborne. Rate of climb is easily above 5000 ft/min