Vertipedia - Curti Zefhir

A two-seat ultralight helicopter meant for recreational or training flights. This aircraft is unique as it is the only helicopter to feature a ballistic parachute, which is located above the main rotor.

Overview

Data on design, manufacture and status

Design authority: Curti Aerospace

Primary manufacturer: Curti Aerospace

Parent type: No type defined

Aircraft status: In development

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Dedicated control device: 1 Tail rotor

Crew required: 1-2 in Side-by-side arrangement

Landing gear: Skids

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

Layout and Dimensions

Weights and Performance

Engine Details

Primary Lift Device

Primary Control Device

Overall Dimensions
Overall Height:	2.50 m	8.2 ft
Overall Length:	8.70 m	28.5 ft
Overall Width:	1.60 m	5.2 ft

Airframe Dimensions
Airframe Length:	6.80 m	22.3 ft
Airframe Width:	1.60 m	5.2 ft
Airframe Height:	2.00 m	6.6 ft

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:	1.60 m	5.2 ft

Cabin Dimensions
Cabin Internal Height:
Cabin Internal Length:
Cabin Internal Width:	1.40 m	4.6 ft

The values for the Max range and the Max level flight speed are taking into account a 10-minute reserve, as this was provided by the manufacturer.

Weights
Max Gross Weight (ground):	700 kg	1,543 lb
Max Gross Weight (airborne):
Max Take-off Weight:	700 kg	1,543 lb
Empty Weight:

Climb Performance
Max Rate of Climb:

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:	4,000 m	13,123 ft

Limitations
Max Level Flight Speed:	185 km/h	100 kts
Never Exceed Speed:	189 km/h	102 kts
Service Ceiling:

Range and Endurance
Max Range:	318 km	172 nm
Max Endurance:	2 hrs

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines:	1
Designation:	PBS Aerospace TS100 turbine
Manufacturer:	PBS GROUP, a.s.

Normal Ratings
Max continuous:	105 kW	141 hp
Take-off / rated:	180 kW	241 hp
Intermediate:
Maximum:

OEI Ratings
OEI contingency:
OEI continuous:
OEI 30-second:
OEI intermediate:

Main Rotor Characteristics
Diameter:	7.60 m	24.93 ft
RPM:	528.0 rpm	528.0 rpm
Direction of Rotation:	Counterclockwise
Hub Type:	Teetering

Main Rotor Blade Characteristics
Blade Construction:	Metal
Blade Chord:	0.195 m	0.64 ft
Blade Tip Geometry:	Flat
Blade Twist:
Number of Blades:	2

Main Rotor Derived Characteristics
Disc Area:	45.36 m²	488.3 ft²
Disc Loading:	15.43 kg/m²	3.160 lb/ft²
Solidity:	0.0327

Main Rotor Blade Derived Characteristics
Blade area per blade:	0.74 m²	8.0 ft²
Tip Speed:	210.11 m/s	689.3 fps

Tail Rotor Characteristics
Diameter:	1.20 m	3.94 ft
Configuration:	Pusher
Direction of Rotation:	Top blade aft
RPM:	3062 rpm	3062 rpm

Tail Rotor Blade Characteristics
Number of Blades:	2
Blade Construction:	Metal
Blade Chord:	0.120 m	0.39 ft
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:	1.13 m²	12.2 ft²
Solidity:	0.1273

Tail Rotor Blade Derived Characteristics
Tip Speed:	192.39 m/s	631.2 fps
Blade Area (per blade):	0.072 m²	0.78 ft²

References

References and sources used

Zefhir Brochure

Curti Aerospace
http://www.zefhir.eu/pdf/Zefhir-helicopter-brochure-2018.pdf?utm_source=pdf_download&utm_medium=pdf_onsite&utm_campaign=zefhir_sito, July 9, 2018 (page 7)
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