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Kolb UltraStar


Single-seat single-engined high-wing monoplane with conventional three-axis control. Wing has unswept leading and trailing edges, and constant chord; cruciform tall. Pitch control by elevator on tail; yaw control by fin-mounted rudder; roll control by full-span ailerons; control inputs through stick for pitch/roll and pedals for yaw. Wing braced from below by struts; wing profile Kolb; double-surface. Undercarriage has three wheels in tail-dragger formation; suspension on tailwheel and optional spring suspen-sion on main wheels. Push-right go-right tailwheel steering connected to yaw control. Brakes on main wheels. Aluminium-tube framework, without pod. Engine mounted below wing driving pusher propeller.

This Homer Kolb production was shown for the first time in public at the Sun ‘n’ Fun meeting in March 1982, then next at Oshkosh. Kolb Company announced that the Ultrastar would go on sale in October 1982 but initial production was delayed, the first kits not being delivered until December.

As with the Flyer, the machine is supplied as a kit requiring the purchaser to do all the fabrication, all the materials and necessary components being included in a price of $3595 in 1982. In March 1983 Kolb Company announced that for $1995 you could have a basic Ultrastar kit of just materials and plans and in addition a covering kit for $345, an accessory kit for $1355 and prefabricated wing ribs for $99.

Engine: Rotax 377
Empty wt. lbs: 245
Max wt. lbs: 525
Wing span: 27ft 8in
Wing area sq.ft.: 148
Length: 20’.
Wing loading lbs/sq.ft: 3.55
Power loading lbs/hp: 15.28
Max speed mph: 63
Cruise mph: 55
Stall mph: 26
Vne mph: 75
Seats: 1

Engine Cuyuna ULII-02, 35 hp at 6250 rpm.
Prop-eller diameter and pitch 50x30 inch, 1.27x0.76m.
V-belt reduction, ratio 2.0/1.
Power per unit area 0.24hp/sq.ft, 2.6 hp/sq.m.
Fuel capacity 5.0 US gal, 4.2 Imp gal, 18.9 litre.
Length overall 20.0 ft, 6.09 m.
Height overall 6.0ft, 1.83m.
Wing span 27.5ft, 8.35m.
Constant chord 5.5 ft, 1.65 m.
Sweepback 0 deg.
Tailplane span 7.8 ft, 2.33 m.
Total wing area 145 sq.ft, 13.5sq.m.
Total aileron area 27.0 sq.ft, 2.51 sq.m.
Wing aspect ratio 5.2/1.
Main wheels diameter overall 14 inch, 36 cm.
Empty weight 235 lb, 107kg.
Max take-off weight 470 lb, 213kg.
Payload 235 lb, 107kg.
Max wing loading 3.13 lb/sq.ft, 15.3 kg/sq.m.
Max power loading 13.4 lb/hp, 6.1 kg/hp.
Max level speed 63 mph, 101 kph.
Never exceed speed 70 mph, 113 kph.
Max cruising speed 50 mph, 80 kph.
Economic cruising speed 40 mph, 64 kph.
Stalling speed 25 mph, 40 kph.
Max climb rate at sea level 1000 ft/min, 5.1 m/s.



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