Compare Curti Zefhir vs Enstrom Helicopter F-28F vs Robinson Helicopters R22 Beta II vs Robinson Helicopters R44 Raven I vs Robinson Helicopters R44 Raven II vs Robinson Helicopters R66
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| Manufacturer | Curti | Enstrom Helicopter | Robinson Helicopters | Robinson Helicopters | Robinson Helicopters | Robinson Helicopters |
| Aircraft Type | Zefhir | F-28F | R22 Beta II | R44 Raven I | R44 Raven II | R66 |
| Base Aircraft Price (USD) | $58,823 | $ 550,000 | $ 312,000 | $ 412,000 | $ 490,000 | $ 920,000 |
| Direct Operating Cost | - | $ 198 | $ 173 | $ 248 | $ 257 | $ 384 |
| DOC / nm | - | $ 2.08 | $ 1.80 | $ 2.30 | $ 2.36 | $ 3.49 |
| DOC / nm / Seat | - | $ 0.69 | $ 0.90 | $ 0.57 | $ 0.59 | $ 0.70 |
| Max Cruise Speed (ktas) | - | 95 | 96 | 108 | 109 | 110 |
| Max Range (nm) | 319 | 229 | 250 | 300 | 300 | 350 |
| Useful Load (lbs) | - | 960 | 490 | 950 | 995 | 1355 |
| Total Seats | 2 | 3 | 2 | 4 | 4 | 5 |
| Cockpit | - | - | - | - | - | 2 |
| Standard Cabin Seats | - | - | - | - | - | 3 |
| Min Crew | - | - | - | - | - | 1 |
| Flight Deck (Base Spec) | - | Gyro / Analog | Gyro / Analog | Gyro / Analog | Gyro / Analog | Gyro / Analog |
| Flight Rules | - | VFR | VFR | VFR | VFR | VFR |
| Certification | - | FAA / EASA | FAA / EASA | FAA / EASA | FAA / EASA | FAA / EASA |
| OEM Verification | - | Un-Verified | Un-Verified | Un-Verified | Un-Verified | Un-Verified |
| Weights | ||||||
| MTOW (lbs) | - | 2600 | 1370 | 2400 | 2500 | 2700 |
| BEW (lbs) | - | 1640 | 880 | 1450 | 1505 | 1345 |
| Useful Load (lbs) | - | 960 | 490 | 950 | 995 | 1355 |
| Fuel Capacity (lbs) | - | 238 | 157 | 279 | 279 | 493 |
| Useful Load Max Fuel (lbs) | - | 722 | 333 | 671 | 716 | 862 |
| Max Baggage Weight (lbs) | 699 | - | - | - | - | - |
| Dimensions | ||||||
| Rotor Diameter (ft) | - | 32 | 25.2 | 33 | 33 | 33 |
| Overall Height (ft) | - | 9 | 8.8 | 10.8 | 10.8 | 11.4 |
| Length (ft) | - | 28.1 | 28.5 | 38.3 | 38.3 | 38.3 |
| Cabin Volume (cu. ft) | - | - | - | - | - | 50 |
| Baggage Volume Int. (cu. ft) | - | - | 1.5 | 2.5 | 2.5 | - |
| Baggage Volume Ext. (cu. ft) | - | 6 | - | - | - | 18 |
| Engine | ||||||
| No. of Engines | - | 1 | 1 | 1 | 1 | 1 |
| Manufacturer | Curti | Enstrom Helicopter | Robinson Helicopters | Robinson Helicopters | Robinson Helicopters | Robinson Helicopters |
| Model | - | HI0-360-F1AD | O-360 | O-540 | IO-540 | RR300 |
| Horsepower | - | 225 | 131 | 225 | 245 | 300 |
| FADEC | - | No | No | No | No | No |
| TBO (hrs) | - | 1500 | 2000 | 2200 | 2200 | 2000 |
| TBO (yrs) | - | 12 | 12 | 12 | 12 | - |
| Fuel Type | - | AvGas | AvGas | AvGas | AvGas | JetFuel |
| Fuel Delivery | - | - | Carbureted | Carbureted | Fuel Injected | - |
| Fuel Capacity (gal) | - | 40 | 115 | 29.5 | 29.5 | 73.6 |
| Avionics | ||||||
| Flight Deck | - | Gyro / Analog | Gyro / Analog | Gyro / Analog | Gyro / Analog | Gyro / Analog |
| Flight Rules | - | VFR | VFR | VFR | VFR | VFR |
| Transponder | - | 1 | 1 | 1 | 1 | 1 |
| VHF Com | - | 1 | 1 | 1 | 1 | 1 |
| VHF NAV | - | - | - | - | - | 1 |
| Cabin | ||||||
| Total Seats | 2 | 3 | 2 | 4 | 4 | 5 |
| Cockpit | - | - | - | - | - | 2 |
| Standard Cabin Seats | - | - | - | - | - | 3 |
| Min Crew | - | - | - | - | - | 1 |
| Other | ||||||
| Gear Type | - | Skids | Skids | Skids | Skids | Low Skids |
| Rotorhead | - | 3-Blade Articulated | 2-Blade Teetoring | 2-Blade Teetoring | 2-Blade Teetoring | 2-Blade Teetoring |
| Tail Rotor | - | 2-Blade | 2-Blade | 2-Blade | 2-Blade | 2-Blade |
| Performance | ||||||
| Max Cruise Speed (Mach) | 185 | - | - | - | - | - |
| Max Cruise Speed (ktas) | - | 95 | 96 | 108 | 109 | 110 |
| Long Range Cruise (ktas) | - | 90 | 83 | 100 | 100 | 110 |
| Max Speed (Vne) | - | 97 | 102 | 130 | 130 | 130 |
| Max Range (nm) | 319 | 229 | 250 | 300 | 300 | 350 |
| Range Seats Full (nm) | - | 209 | 206 | 258 | 257 | 341 |
| Max Climb Rate (fpm) | - | 1150 | 1000 | 1000 | 1000 | 1000 |
| Service Ceiling (ft) | - | 12000 | 14000 | 14000 | 14000 | 14000 |
| Hover IGE (ft) | - | 7700 | 9400 | 6400 | 8950 | 10000 |
| Hover OGE (ft) | - | - | - | - | - | 10000 |