From top speed to wing span YAK54 gives you all the specs.
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Disclaimer: All data shown in this table is based on the manufacture's information and is subject to change due to further modifications of the aircraft.

Empty aircraft mass...............1,662.2lbs.

Load:
pilots with parachutes 520 lbs.
oil............................17 lbs.
fuel..........................110 lbs.

Take-off weight, except for the ferry version 2,178 lbs.
Engine................................
M 14X/360HP Propeller.................
MTV9 three-blade ....variable pitch

MAIN FLIGHT CHARACTERISTICS AT ISA CONDITIONS:
Operating altitude..................................0-11810 ft.
Top speed .............................................280 mph
Stalling speed........................................................ 65 mph
Lift-off speed.......................................................80.8 mph
Landing speed.....................................................83.9 mph
Roll rate at flight speed not exceeding........186.4mph.........................343 deg/sec
Ferry range at 1,640 ft. atitude , .............................124.3 mph
Speed,........................... with 309 lbs. of fuel and min 7%
Reserve..............435 mi.
Rate of climb at sea level............................... 2,953 ft/min
Length .....................................................................22'-8"
Wing span ...............................................................26'-9"
Wing area.........................................................138.8 sq.ft.
G-limits.......................................................................+9/-7
Take-off and landing run on soil of at least 11lbs/0.16sq.inch -556/1476ft