FORM: Power Train ~ UniCopter

For ARR Rotor:

Designing for the Lycoming O-320 engine, with consideration for the O-360.

 

Speed:

 

Power:

 

Torque:

 

 

Ratio:

 

Loss:

 

 

 

Engine:

2400

rpm

124 (1)

hp

271 (2)

ft-lb

Primary: (belt)

1

: 1

2..5

%

 

 

Intermediate:

2400

rpm

120.9

hp

265

ft-lb

Secondary:

1.5

: 1

1.0

%

 

 

X-shaft:

1600

rpm

119.7

 

397

ft-lb

Final:

3.33

: 1

1.0

%

 

 

Rotor:

480 (4)

rpm

118.5

hp

1314

ft-lb

Total:

5.0

: 1

4.5 (3)

%

 

 

(1) The above engine is rated at 160 hp. Robinson shows the maximum continuous power at 124 for a 150 hp O-320. See; DESIGN: Engine - Reciprocating - Lycoming - General Information

(2) Q =( hp * 5252) / rpm

(3) An additional 1% might be deducted for accessories, such as hydraulic pump etc.

(4) With rotor radius of 9'-9" the tip speed will be 334 mph, 0.45 M

Calculations are based on operating speed of 100%.

For CVJ+HS Rotor:

Designing for the Lycoming O-320 engine, with consideration for the O-360.

 

Speed:

 

Power:

 

Torque:

 

 

Ratio:

 

Loss:

 

 

 

Engine:

2400

rpm

124 (1)

hp

271 (2)

ft-lb

Primary: (belt)

1

: 1

2..5

%

 

 

Intermediate:

2400

rpm

120.9

hp

265

ft-lb

Secondary:

2.0

: 1

1.0

%

 

 

X-shaft:

1200

rpm

119.7

 

524

ft-lb

Final:

2.0

: 1

1.0

%

 

 

Rotor:

600

rpm

118.5

hp

1037

ft-lb

Total:

4.0

: 1

4.5 (3)

%

 

 

(1) The above engine is rated at 160 hp. Robinson shows the maximum continuous power at 124 for a 150 hp O-320. See; DESIGN: Engine - Reciprocating - Lycoming - General Information

(2) Q =( hp * 5252) / rpm

(3) An additional 1% might be deducted for accessories, such as hydraulic pump etc.

Calculations are based on operating speed of 100%.

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Last Revised: October 19, 2006