Instytut Lotnictwa: JK-1 Trzmiel

General data

Producer info

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Names and dates
Market original model designation
JK-1
Market model designation (english translation or spelling)
JK-1
Original model name
Trzmiel
Model name (english translation or spelling)
Trzmiel
Project start date
1955
Date of prototype completion
1957
Tests start date
1957-05
Project end date
1960
Country of manufacture
Poland
People involved
Stanislaw Wojcicki {Stanisław Wójcicki}Design engineer
Jerzy Kotlinski {Jerzy Kotliński}Project leader
Antoni Smigiel {Antoni Śmigiel}Test pilot
Config info
Rotorcraft typeHelicopter
Config
Single rotor
Way of counteracting main rotor torque
Counteracting torque not required
Weights
Maximum Takeoff Weight (MTOW)
340
kg
Manufacturers empty weight (MEW)
140
kg
Cabin and cockpit
Maximum number of people onboard
1
External dimensions
Length
2.95
m
Height
2.14
m
Main rotor
Cyclic control
Swash-plate (direct)
Main rotor diameter
7
m
Main rotor direction of rotation
Counterclockwise
Number of blades
2
Powerplant
Static thrust of a single engine
123
N
Fuel system
Fuel tank capacity
100
l
Performance
Maximum horizontal flight speed (Vh)
131
km/h
Maximum service ceiling
5500
m
Maximum flight endurance
0.25
h
0.0658