Bert Sisler, of Barnsville, Minnesots, second design was the mid-wing Whistler. The two-seat craft is convertible from tailwheel to tri-gear configuration. The fuselage is tubular steel and fabric, the wings and tail are of wood geodetic construction with fabric covering. The baggage compartment has a 70 lb capacity.
The SF-2 Whistler N5549 built in 1973 was improved to become the SF-2A Cygnet circa 1977.
Designed by Burt Sisler, USA, the two-place, plans-built, VW powered Cygnet has geodesic wing construction, offers excellent short-field performance, good climb rate and ease of control. It can handle two 175-pound people and 80 lbs of baggage. This is a United States designed side by side 2 seater being designed for STOL operations. The Cygnet features folding wings and is designed for running on Mogas. Early United States mac¬hines were powered by a 60 hp HAPI engine, providing a 100 mph cruise and 350 mile range.
The Cygnet Model SF-2A in 2008 was available from:
Viking Aircraft
333 Sunny Hill Dr
Elkhorn, Wisconsin 55312
SF-2 Whistler
Engine: 70 hp Baker VW1834
Wingspan: 30’0″
Length: 19 ft
Height: 5 ft 9.5 in
Empty weight: 645 lb
Useful load: 500 lb
Baggage capacity: 70 lb
Max speed: 95 mph
Cruise: 86 mph
Stall: 43 mph
Landing speed: 42 mph
Landing roll: 300 ft
ROC solo: 700 fpm
Seats: 2
SF-2A Cygnet
N191S
Engine: 62hp Barker-VW 1834cc
Wingspan: 30’0″
Length: 19’0″
Useful load: 515 lb
Max speed: 108 mph
Cruise: 100 mph
Stall: 48 mph
Seats: 2
SF-2A Cygnet
Engine: 1835cc HAPI VW conversion
HP range: 60-82
Speed max: 108 mph
Cruise: 90-100 mph
Range: 390 sm
Stall: 41 mph (solo), 48 mph (dual)
ROC: 580 fpm
Take-off dist: 700 ft
Landing dist: 700 ft
Fuel cap: 15 USG
Weight empty: 585 lbs
Gross: 1100 lbs
Height: 5.83 ft
Length: 19 ft
Wing span: 30 ft
Wing area: 125 sq.ft
Seats: 2
Landing gear: tail wheel
Cygnet SF-2A
Engine: 1835 60HP VW
Span: 30 ft
Empty Weight: 585 lbs
Useful Load: 515 lbs
Seats: 2 Side by Side
Stall: 48 mph
Landing Speed: 60 mph
Cruise: 100 mph
Rate of Climb: 580 fpm
All Aero 