|Engines||1*960hp M-103||2*960hp M-103|
|Wing Load (kg/m2)||171||225|
|Power load (kg/hp)||4.2||2.7|
|Speed at 0m||332km/h||-|
|Speed at 4500m||400km/h||570km/h|
|Guns||1*7.62mm ShKAS or 2*12.7mm UB|
High speed close support bomber. It combined power of twin-engine aircraft with low drag of a classic single-engine scheme.
The S had a very long, slender fuselage that contained two engines in tandem ('sparka') in front of the wing, each driving part of a six-bladed contra-rotating propeller. The 'greenhouse' cockpit with the two seats was well aft of the small wing.
Unique powerplant ('sparka') was developed and tested prior to the aircraft. It was pretty simple and efficient, but added 150kg of weight.
Electric control systems were used widely (unusual for Soviet pre-War aircraft), including remotely controlled machineguns in the very tail.
Whole metal aircraft incorporated several novel solutions (especially in wing and fuselage construction), which will be found useful decade later in such aircraft as Il-28. Wing was equipped with large flaps to simplify landing - wing load of 225kg/m2 was a record high. During flight test wing airfoil had to be modified, and it was performed on same wing by adding 'second skin'. Some tests were carried out with second engine removed.
|64k drawing from same source used to make a background;|
|Modified June 3, 1997||Back to|