While the Humbug is foot-launchable and foot-recoverable, “auxiliary” wheels are available as well as floats, skis, ice skates or dune buggy wheels. The convenient mixer stick operates three-axis controls, and foot pedals operate the rudder. Construction, for the most part, consists of aluminum tubes and channel fittings, plastic end caps, nylon cable eyes, stainless cables and 3.8-ounce Dacron envelopes for the tail and wings. Power for the Humbug can come from several options; the most popular to this point is a twin-engine Gemini power system that uses a Partner (Swedish chain saw) engine which can be modified to develop from five to nine hp. Chrysler engines which are rated at 10 hp each are also available. Setting up the Humbug for flight requires only 20 minutes. It was available as a finished, test-flown airplane or as a kit.

The Skyseeker Explorer bears a passing resemblance to the Worldwide Clipper, except that the company has stuck to aluminum tubing for the fuselage instead of the Clipper’s welded steel. Powered by a Rotax 277.

Engine: Rotax 277
Max speed: 75 mph

1984. Centre mounted joy stick, rudder pedals, tailwheel steerable through rudder pedals.

Empty wt: 252 lbs
Wing span: 32 ft
Wing area: 160 sq.ft
Height: 9 ft 9 in
Length: 19 ft
Fuel cap; 5 USG
Construction: Aluminium, Dacron
Engine: Rotax 277 (268 cc) 28 hp
Static thrust: 180 lbs
Max wt: 496 lbs
Stall: 20 mph
Max speed: 60 mph
Vne: 75 mph
Climb rate: 750 fpm @ 30 mph
Design limit: +4, -2g
Glide ratio: 6-1
Wing loading: 3.1 lbs/sq.ft
Power loading: 17.71 lbs/hp

The Skyriders company builds a European version of the Ultralight Flight Phantom, which is identical to the American machine except for the power pack and a larger fuel tank.

Ultralight Flight fit a Kawasaki TA440 engine and, while this variant remains avail¬able in Europe, the popularity of Robin engines in Europe has led Skyriders to standardise on the Robin EC44 power unit.

Nicklow En¬gineering supplies his engine in lightweight form, without cooling fan, in which guise it gives 295 lb (134 kg) of static thrust.

Engine: Robin EC44, 58 hp at 7200 rpm
Propeller diameter and pitch 60 x 30 inch 1.52 x 0.76 m
Toothed belt reduction, ratio 2.5/1
Max static thrust 295 lb, 134 kg
Power per unit area 0.41 hp/sq.ft, 4.4 hp/sq.m
Fuel capacity 6.0 US gal, 5.0 Imp gal, 22.7 litre
Empty weight 229 lb, 104kg
Max take off weight 509 lb, 231 kg
Payload 280 lb, 127 kg
Max wing loading 3.61 lb/sq.ft, 17.6 kg/sq.m
Max power loading 8.8 lb/hp, 4.0kg/hp
Max recommended level speed 70mph, 113kph
Max possible level flight speed >80mph, >129kph
Never exceed speed 100 mph, 161 kph
Max cruising speed 70mph, 113kph
Economic cruising speed 50 mph, 80 kph
Stalling speed 28 mph, 45 kph
Max climb rate at sea level 1500 ft/ min, 7.6 m/s
Take off distance 60 ft, 18 m on concrete
Landing distance 50 ft, 15 m on concrete
Range at average cruising speed 150 mile, 241 km