Technical data
Type	AIR-2S Ya-2S	AIR-2S Ya-2S floatplane
Function	trainer
Year	1931	1931
Crew	2
Engines	1*60hp 'Cirrus I'
Length	7.0m	7.7m
Wingspan	8.8m
Wing area	18.7m²
Empty weight	420kg	470kg
Loaded weight	660kg	710kg
Wing Load (kg/m²)	35.3	38.0
Power load (kg/hp)	7.8	8.4
Maximum Speed at 0m	150km/h	140km/h
Cruise Speed	130km/h	120km/h
Landing Speed	60km/h	65km/h
Landing Roll	7sec	7sec
Takeoff Roll	-	20sec
Ceiling	-	3350m
Range	-	500km

AIR-2S, Ya-2S, A.S.Yakovlev

4bk b/w the AIR-2S engine start near the Krymskij Most (Crimea Bridge), Moscow river, Moscow. Crowd on the bridge is ready for a show ('Notes of an aircraft designer')

20k drawing from "History of aircraft construction in the USSR", Vol.1 p.428

Version of the AIR-2 with more powerful 'Siemens' engine. Performance was improved substantially. It became possible to install AIR-2S on floats designed by V.B.Shavrov. Floatplane version was flown on May 18, 1931. Transition from wheels to floats took as little as 1hour 10minutes. Pilot B.L.Bukhgolts and passenger V.B.Shavrov performed short straight flight, and without stopping the engine another 10 minutes circle flight. Next crew to fly were Ju.I.Piontkovskij and A.S.Yakovlev.

Aircraft was flown many times on Moscow river (Moscow) without any problems.

References:

"History of aircraft construction in the USSR", Vol.1 p.427;
'Notes of an aircraft designer';

More Links:

A.S.Yakovlev Museum;

Yakovlev aircraft at D.Levin AirPage