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The IS-4 Jastrząb (Instytut Szybownictwa – gliding institute) was a single-seat aerobatic glider designed and built in Poland from 1949.

Made by Instytut Szybownictwa.

Empty Weight Lb
562
Wing Area Sqm
14
Designer
J Niespał
Span Ft
39
Max Speed Mph
280
Aspect Ratio
10
Introduced
1950
Glide Ratio
20
Span In
4
Gross Weight Lb
750
Sink Rate Ms
1
Number Built
37
Crew
1
Empty Weight Kg
255
Gross Weight Kg
340
Min Sink Speed Mph
45
Height In
3
Sink Rate Ftmin
213
Manufacturer
Instytut Szybownictwa
Max Speed Kts
243
First Flight
21
Max Speed Kmh
450
Height Ft
4
Origin
Poland
Min Sink Speed Kts
39
National Origin
Poland
Wing Area Sqft
148
Met Or Eng
met
Min Sink Speed Km/h
73
Span M
12
Length Ft
20
Height M
1
Similar Aircraft
* Vogt Lo 100
Length In
6
Length M
6
Category
Polish sailplanes 1940-1949

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