UFM Easy Riser
|UFM Easy Riser|
|Role||Hang glider & Ultralight aircraft|
|National origin||United States|
|Manufacturer||Ultralight Flying Machines|
|Designer||Larry Mauro & John Moody|
|First flight||1975 (powered ultralight)|
|Status||In limited production (hang glider version, 2002)|
|Variants||Mauro Solar Riser
Pterodactyl Light Flyer
The UFM Easy Riser is an American swept wing biplane hang glider that was first powered in 1975, becoming the first modern ultralight aircraft. The Easy Riser was still in production as an unpowered glider in 2002 by Ultralight Flying Machines.
Design and development
The Easy Riser was developed by Larry Mauro from the earlier Kiceniuk Icarus II biplane hang glider. An engine was installed by John Moody in 1975 so the glider could be launched from flat terrain.
Early powered versions consisted simply of a motor added to the foot-launched hang glider version with control by a combination of weight shift for pitch and tip rudders for roll and yaw, with the tip rudders used together as air brakes. Because many pilots could not run fast enough to achieve take-off wheeled tricycle gear was added. The aircraft exhibited poor pitch stability so a horizontal stabilizer and elevator was added. Finally on later versions the tip rudders were replaced with a tail-mounted rudder.
The Easy Riser is constructed with an aluminium structure and stamped ribs, covered in doped aircraft fabric covering, Mylar or other coverings. The pilot sits on a fabric sling seat. Engines used include the 11 hp (8 kW) McCulloch MAC-101, 15 hp (11 kW) Hirth F-36 and Solo 210.
Easy Risers were produced in large numbers until the ultralight market downturn of the early 1980s when the type was taken out of production. Later the unpowered glider version was put back into limited production.
Aircraft on Display
- Canadian Air & Space Museum - Easy Riser used by Bill Lishman in projects to teach birds to migrate
- EAA AirVenture Museum - two Easy Risers and the Solar Riser.
- US Southwest Soaring Museum - Easy Riser
Specifications (Easy Riser ultralight)
Data from EAA
- Crew: one
- Length: 9 ft 0 in (2.74 m)
- Wingspan: 30 ft 0 in (9.14 m)
- Height: 4 ft (1.2 m)
- Wing area: 170 sq ft (16 m2)
- Empty weight: 120 lb (54 kg)
- Gross weight: 320 lb (145 kg)
- Powerplant: 1 × McCulloch MAC-101 two cylinder inline engine, 11 hp (8.2 kW)
- Propellers: 2-bladed wooden, 4 ft 6 in (1.37 m) diameter
- Maximum speed: 40 mph (64 km/h; 35 kn)
- Cruise speed: 25 mph (40 km/h; 22 kn)
- Stall speed: 20 mph (32 km/h; 17 kn)
- Range: 100 mi (87 nmi; 161 km)
- Service ceiling: 9,000 ft (2,700 m)
- Rate of climb: 300 ft/min (1.5 m/s)
- Wing loading: 1.88 lb/sq ft (9.2 kg/m2)
Notable appearances in media
- Aircraft of comparable role, configuration and era
- Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page E-14. Cybair Limited Publishing, 2001. ISBN 0-9680628-1-4
- Experimental Aircraft Association (2011). "UFM EASY RISER". Retrieved 6 March 2011.
- Experimental Aircraft Association (2011). "UFM-APP EASY RISER". Retrieved 6 March 2011.
- Moody, John (2002). "CURRENT EASYRISER INFO". Retrieved 6 March 2011.
- Rogers, Bennett: 1974 Sailplane Directory, Soaring Magazine, page 99. Soaring Society of America, August 1974. USPS 499-920
- Experimental Aircraft Association (2011). "UFM/MAURO SOLAR RISER". Retrieved 6 March 2011.
- AIAA/SAE/ASME 20th Joint Propulsion Conference (1984). "AIAA paper 84-1429" (PDF). Retrieved 6 March 2011.
- Canadian Air & Space Museum (2011). "Easy Riser Ultralight". Retrieved 12 September 2011.
- US Southwest Soaring Museum (2010). "Sailplanes, Hang Gliders & Motor Gliders". Retrieved 26 May 2011.
- Experimental Aircraft Association (2011). "UFM EASY RISER Specifications". Retrieved 6 March 2011.