Credit
Original uploader was User:Ahunt at en:wikipedia · Public domain · Resized · Public domain · Source ↗ · Modified
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At a glance
Measured figures
F28F · Length
Single source29 ft 3 in (8.92 m)[source]
R44 Raven II · Length
Single sourceConfiguration
| Specification | Enstrom F-28 | Robinson R44 |
|---|---|---|
| Crew | one[source] | 1/2 (There are 4 seats including the pilot, so there can be pilot and co-pilot, with two passengers, or alternately a single pilot with 3 passenger spots)[source] |
| Type | Light helicopter[source] | Light utility and trainer helicopter[source] |
| Manufacturer | Enstrom Helicopter Corporation[source] | Robinson Helicopter Company[source] |
| Manufactured | 1965-present[source] | 1990–present |
38 ft 3 in (11.66 m)[source]
F28F · 1 × Lycoming HIO-360-F1AD four-cylinder, direct-drive, horizontally opposed, air-cooled, piston aircraft engine
Single source1 × Lycoming HIO-360-F1AD four-cylinder, direct-drive, horizontally opposed, air-cooled, piston aircraft engine, 225 hp (168 kW)[source]
R44 Raven II · 1 × Lycoming IO-540-AE1A5 6-cylinder air-cooled horizontally-opposed piston engine
Single source1 × Lycoming IO-540-AE1A5 6-cylinder air-cooled horizontally-opposed piston engine, 245 hp (183 kW)[source]
F28F · Endurance
Single source3 hr 30 min[source]
F28F · Service ceiling
Single source12,000 ft (3,700 m)[source]
F28F · 1,450 ft/min (
Single source1,450 ft/min (7.4 m/s)[source]
Bars compare reported quantities only. A larger figure does not make a system better; configurations and test conditions differ.
| Introduction date | 1965[source] | 1993[source] |
|---|
| Variants | Enstrom TH180 Spitfire Mark I[source] | — |
|---|
| Developed into | Enstrom 480[source] | Robinson R66[source] |
|---|
| Capacity | two passengers[source] | 3/2 / 748 lb (339 kg)[source] |
|---|
| Main rotor area | 804 sq ft (74.7 m 2 ) NACA 0013.5[source] | 855.4 sq ft (79.47 m 2 )[source] |
|---|
| Country of origin | Vereinigte Staaten[source]Country of design · Entwurfsland | United States[source]Inventory Origin column; table 6, row 11, cell 3; revision 1376110979; retrieved 2026-09-30 |
|---|
| Designer | — | Frank D. Robinson[source] |
|---|
| Status | — | In production[source] |
|---|
| Number built | — | 6,866+ (through 2023)[source] |
|---|
| First flight | — | 31 March 1990[source] |
|---|
| Developed from | — | Robinson R22[source] |
|---|
| Fuel capacity | — | Fuel: 100 octane low lead (100LL) fuel or 100/130 octane[source] |
|---|
| Airfoil | — | NACA 63-015[source] |
|---|
| Main tank capacity | — | 31.6 US gal (26 imp gal; 120 L)[source] |
|---|
| Main tank usable fuel | — | 30.6 US gal (25 imp gal; 116 L)[source] |
|---|
| Auxiliary tank capacity | — | 18.5 US gal (15 imp gal; 70 L)[source] |
|---|
| Auxiliary tank usable fuel | — | 18.3 US gal (15 imp gal; 69 L)[source] |
|---|
| Fuel consumption | — | 15 gallons per hour (12 imp gal/h; 57 L/h)[source] |
|---|
| Altitude restrictions | — | 14,000 ft (4,300 m) density altitude or 9,000 ft (2,700 m) above ground level in order to be able to reach ground within 5 minutes in case of fire[source] |
|---|