Hiller H-23
Technical  Specifications

First Flight: N/A
Number Built: N/A
Length: 27 feet  8 inches
Main Rotor Diameter: 35 feet 
Tail Rotor Diameter:   5 feet 5 inches
Height:   9 feet 8 inches
Max Take-Off Wt.: 2,428 lbs.
Empty Wt.: 1,789 lbs.
Max Cruising Speed:   92 mph   80 kts
Normal Cruising Speed:   66 mph   57 kts
Service Ceiling: 12,600 feet
Fuel Capacity: N/A
Range: 173 miles 
Fuel Type: 80/87 octane
Fuel Consumption: 20 gph
Engine: 1 Lycoming VO-435 rated @ 260 HP
Seating: 2 Passengers 
Crew: 1 Pilot 

Engine Specifications

 Lycoming VO-435

Type: 6 cylinder air cooled, horizontally opposed 
Height: 25.19 inches
Width: 33.32 inches
Depth: 25.19 inches
Bore: 4.875 inches
Stroke: 3.875 inches
Displacement: 434 cubic inches
Compression Ratio: 7.30 to 1
Dry Weight: 396 lbs. 
Ignition: Dual Scintilla S6L9-20 & S6RN-21
Fuel Grade: 80/87 octane
Carburation: Marvel-Schebler MA4-5 AA
Starter: N/A
Generator: N/A
Fuel Pump: N/A
Performance: Take-Off rated @ 270 HP @ 3400 rpm
Normal rated @ 250  HP @ 3200 rpm