Design Origins and Purpose
The Twin E-Z Flyer emerged from the innovative mind of Wayne Winters, who sought to create a specialized platform for air-to-ground photography operations where twin-engine safety was paramount. Building upon his successful single-engine EZ Flyer design, Winters recognized the need for redundant power when operating over hostile terrain or conducting extended photography missions. The aircraft drew inspiration from other successful twin-engine ultralight designs, particularly the Ultraflight Lazair and Leza-Lockwood Air Cam.
Engineering Modifications
Winters extensively modified his original EZ Flyer design to accommodate the twin-engine configuration. The most significant change involved creating an entirely new center wing section to house two engines mounted side-by-side in pusher configuration. This modification increased the wingspan from the original design to 35.5 feet, expanding the total wing area to 235 square feet. The fuselage required stretching by 2 feet to reach a total length of 23 feet, specifically engineered to provide unobstructed forward visibility for the front seat occupant during photography operations.
Blue Yonder Aviation
Blue Yonder Aviation, based in Indus, Alberta, Canada, served as both designer and manufacturer of this unique aircraft. The company operated as a flight school and aircraft manufacturer, with Wayne Winters leading the design efforts. Despite the prototype's successful demonstration and extensive review by aviation publications, Blue Yonder never expanded production beyond the single example, focusing instead on their flight training operations.
Technical Specifications and Performance
The Twin E-Z Flyer retained several design elements from its single-engine predecessor, including Junker's ailerons, Clark "Y" airfoil configuration, and an open lattice "N" girder fuselage constructed from 4130 steel tubing. The prototype utilized twin Rotax 503 two-stroke engines, each producing 50 horsepower, though the design accommodated alternative Rotax powerplants including the 64-horsepower 582, 80-horsepower 912, or 100-horsepower 912S variants.
With an empty weight of 789 pounds and maximum gross weight of 1,400 pounds, the aircraft demonstrated respectable performance figures. Maximum speed reached 100 mph, while cruise speed settled at 70 mph with a remarkably low stall speed of just 35 mph. The design achieved a service ceiling of 15,000 feet and operational range of 352 miles, making it suitable for extended photography missions.
Safety Innovations
Recognizing the critical importance of engine-out handling characteristics, Winters incorporated an enlarged vertical tail surface to improve directional control during single-engine operations. This modification proved essential for twin-engine aircraft, where asymmetric thrust during engine failure can create dangerous handling characteristics. The pusher configuration also provided improved visibility and reduced propeller strike risk during ground operations.
Operational History
Despite extensive demonstration flights and favorable reviews in aviation publications, the Twin E-Z Flyer remained a one-off prototype throughout its operational life. Blue Yonder Aviation utilized the aircraft within their flight school operations, providing students with experience in twin-engine handling characteristics unique among ultralight aircraft. The open cockpit configuration and tandem seating arrangement made it particularly suitable for instruction, allowing clear communication between instructor and student.
Market Reception and Legacy
The aircraft's specialized nature and limited production reflected the niche market for twin-engine ultralights. While the design successfully demonstrated the feasibility of reliable twin-engine ultralight aircraft, the added complexity and cost compared to single-engine alternatives limited commercial appeal. The prototype's continued operation into the 2000s proved the design's fundamental soundness, but economic factors prevented series production.
Design Classification
The Twin E-Z Flyer could be constructed to meet either basic ultralight or amateur-built experimental aircraft regulations, providing flexibility for potential builders. This dual classification approach allowed operators to choose the regulatory framework best suited to their intended use, though the aircraft's weight and performance characteristics pushed the boundaries of traditional ultralight definitions.
Current Status
The sole Twin E-Z Flyer prototype remains the only registered example of this design, serving as a testament to innovative engineering within the ultralight aviation community. Its specialized role in aerial photography operations and unique twin-engine configuration secured its place in aviation history as a successful prototype that demonstrated advanced concepts within the constraints of ultralight aircraft regulations.