IS-4 Jastrząb

what is it?

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

base stats

• seats 1passengers
• size 357 kgmax take-off weight
• built 37made in total

Bars compare against all aircraft: 3,500 km/h, 20,000 km, 850 seats; size and number built on a log scale up to 640 t (An-225) and 45,000 built (Cessna 172).

fun facts

• 🎂First flew 77 years ago, in 1949.
• 🚗Wingspan of 12 m: about 3 cars parked nose to tail.

no engine: No engine: it glides on rising air.

spec sheet

first flight

1949-12-21

introduced

1950

number built

37

role

glider

origin

🇵🇱 Poland

makers

Szybowcowy Zakład Doświadczalny

engines

none (glider)

crew

1

passengers

1

length

6.3 m

wingspan

12 m

height

1.3 m

max take-off weight

357 kg

top speed

—

range

—

Specs are for the version in the Wikipedia article's specification section. Blank means the sources don't say.