| Model |
Hirth F23 |
| No. Cylinders |
2 (horizontally opposed) |
| Displacement |
521 cc |
| Horsepower |
50 hp |
| Recommended TBO |
1000 hrs |
| Propeller |
66 in x 30 in |
| Length |
18 ft 1 in |
| Height. |
8 ft 10 in |
| Wingspan |
28 ft 0 in |
| Wing area |
156 sq ft |
| Wing loading |
3.36 lb/sq ft |
| Power loading |
10.5 lb/hp |
| Seats |
1 |
| Minimum flight crew |
1 |
| Empty weight |
250 lbs |
| Useful load |
275 lbs |
| Payload w/full fuel |
245 lbs |
| Max takeoff weight |
525 lbs |
| Fuel Capacity |
5 gal |
| Takeoff distance, ground roll |
40 ft |
| Takeoff distance, 50 ft obstacle |
150 ft |
| Rate of climb |
900 ft/min |
| Max level speed, sea level |
54 mph |
| Landing distance, 50 ft obstacle |
200 ft |
| Landing distance, ground roll |
60 ft |
| Glide Ratio |
5.5:1 |
|
|
| CRUISE PERFORMANCE CHART & FUEL FLOW: |
| @ 55% power 4125 rpm |
1.8 gph |
44 mph |
| @ 65% power 4575 rpm |
2.0 gph |
47 mph |
| @ 75% power 5025 rpm |
2.5 gph |
50 mph |
| @ 100% power 6150 rpm |
4.3 gph |
54 mph |
| LIMITING AND RECOMMENDED SPEEDS |
| Vx (Best angle of climb) |
33 mph |
| Vy (Best rate of climb) |
36 mph |
| Va (Design maneuvering) |
48 mph |
| Vne (Never exceed) |
65 mph |
| Vs (stall, power off) |
24 mph |
| Landing approach speed |
31 mph |
|
