Centre mounted joy stick, rudder pedals, tail wheel steerable through rudder pedals.

Empty wt: 248 lbs
Wing span: 30’6”
Wing area: 148 sq.ft
Height: 7’
Length: 17’
Fuel cap; 4.5 USG
Construction: Aluminium, Dacron
Engine: Rotax 277 (268 cc) 28 hp
Static thrust: 230 lbs
Max wt: 500 lbs
Stall: 25 mph
Max speed: 62 mph
Vne: 75 mph
Climb rate: 800 fpm @ 35 mph
Design limit: +6, -4g
Glide ratio: 7.5-1
Wing loading: 3.42 lbs/sq.ft
Power loading: 17.86 lbs/hp

Single seat single engined mid wing mono¬plane with unconventional three axis control (conventional three axis control optional). Wing has unswept leading and trailing edges, and constant chord; V tail. Pitch/yaw control by elevon; roll control by one third span ailerons; control inputs through stick for pitch/yaw/roll (optional: stick for pitch/roll and pedals for yaw). Cantilever wing; wing profile; double surface. Undercarriage has three wheels in tricycle formation (MkIII and MkIII B), tail dragger formation (MkII); suspension on all wheels. Nosewheel steering independent from yaw control. Wood/foam/steel tube fuselage, partially enclosed (totally enclosed optional). Engine mounted above wing driving pusher propeller. Mylar wing covering.

Ultra Efficient Products Invader Article

Conceived by Nick Leighty, the prototype Invader was seen for the first time at Sun ‘n’ Fun in 1982 where it won the outstanding aircraft award, which ensured considerable success every time the aircraft appeared in public. The aircraft is covered in transparent plastic which allows the whole structure of the aircraft to be seen and is proving to be a real marketing asset.

The Invader is controlled purely through a stick in the standard version, a mixer transmitting the stick movements to the ailerons and the elevons on the V tail. It is possible, however, to build this single seater to give conventional control using the rudder bar, which is fitted anyway to control the steering. On the MkIII type (with tricycle undercarriage) it controls the nosewheel, while on the MkII (with tail dragger under-carriage) it steers the tailwheel, the undercar¬riage being the principal difference between the two versions. The wing is made up of a central section to which are joined the wings and the aileron controls and these are demountable for easy transport and garaging.

Offered as a set of plans for $60 in 1983, the cost of building an aircraft being reckoned at $1500 for material and 300 400h labour. Ribs are made of white block styr¬ofoam, hot wire cut to shape and reinforced with spruce cap strips to tie them to the spar. The geodesic structure ensures excellent rigidity and the fuselage structure is made up of 4130 chrome molybdenum steel, welded. However, the rib structure has not been well received by the European homebuilders, where there are still few people used to the idea of a ‘consumable’ aircraft, as these ribs have an expected life of around four years if the aircraft is garaged or covered when not in use.

At Sun ‘n’ Fun in March 1983 Ultra Efficient Products confirmed its intention to sell the Invader as kits during this year. At that time the machine was expected to have a Yamaha engine with reduction drive or a Zenoah G25B of 20 to 22 hp using direct drive. However, since then a MkIII B version has appeared, similar in all respects to the MkIII but with Rotax 277 power. The undercarriage configuration does not make a significant difference to the weight or per¬formance of the aircraft.

Engine: Yamaha, 14hp rpm
Power per unit area 0.10hp/sq.ft, 1.1 hp/sq.m
Fuel capacity 2.5 US gal, 2.1 Imp gal, 9.5 litre
Length overall 18.0 ft, 5.49 m
Height overall 4.0ft, 1.22m
Wing span 31.0ft, 9.44m
Constant chord 4.5 ft, 1.37 m
Sweepback 0 deg
Total wing area 140 sq.ft, 13.0 sq.m
Wing aspect ratio 6.9/1
Empty weight 165 lb, 75kg
Max take off weight 380 lb, 172kg
Payload 215 lb, 98 kg
Max wing loading 2.71 lb/sq.ft, 13.2 kg/sq.m
Max power loading 27.1 lb/hp, 12.3 kg/hp
Load factors +4, 4 design
Max level speed 55mph, 88kph
Never exceed speed 60 mph, 97 kph
Max cruising speed 40 mph, 64 kph
Stalling speed 20 mph, 32 kph
Max climb rate at sea level 500 ft/min, 2.5 m/s
Min sink rate 250 ft/min at 40 mph, 13 m/s at 64 kph
Best glide ratio with power off 14/1 at 40 mph, 64 kph
Take off distance 150 ft, 45 m
Landing dis¬tance 175 ft, 53 m
Service ceiling 4000 ft, 1220 m
Range at average cruising speed 100 mile, 161 km

Engine: Rotax 277, 28hp at 6500 rpm
Propeller diameter and pitch 44 x 15 inch, 1.12 x 0.38 m
Power per unit area 0.20hp/sq.ft, 2.2 hp/sq.m
Fuel capacity 2.5 US gal, 2.1 Imp gal, 9.5 litre
Length overall 18.0 ft, 5.49 m
Height overall 4.0ft, 1.22m
Wing span 31.0ft, 9.44m
Constant chord 4.5 ft, 1.37 m
Sweepback 0 deg
Total wing area 140 sq.ft, 13.0 sq.m
Wing aspect ratio 6.9/1
Empty weight 185 lb, 84kg
Max take off weight 400 lb, 181kg
Payload 215 lb, 98 kg
Max wing loading 2.86 lb/sq.ft, 13.9 kg/sq.m
Max power loading 20.0 lb/hp, 6.5 kg/hp
Load factors +3.5 design
Max level speed 60mph, 97kph
Never exceed speed 70 mph, 113 kph
Max cruising speed 45 mph, 72 kph
Economic cruising speed 40mph, 64kph
Stalling speed 22 mph, 35 kph
Max climb rate at sea level 500 ft/min, 2.5 m/s

Invader Mk.IIIB
Engine: Rotax 277, 28 hp
Empty wt.: 245 lbs
Max wt.: 475 lbs
Wing span: 31 ft
Wing area: 144 sq.ft.
Length: 5.49m
Aspect ratio 7:1
Length 18’
Wing loading: 3.2 lbs/sq.ft
Power loading: 16.9 lbs/hp
L/D 14:1
Max speed mph: 60 mph
Cruise: 50 mph
Stall: 27 mph
Vne: 80 mph
Seats: 1
Takeoff roll 150 ft
Climb rate 500 fpm
Fuel capacity 1.25 USG

Invader Mk.IV Sport
Engine: Rotax 277, 28 hp
Prop: 56 x 22
Wing sapn: 28 ft
Wing area: 126 sq.ft
Empty wt: 225 lbs
Max wt: 450 lbs
Cruise: 50 mph
Stall: 27 mph
Vmax: 60 mph
ROC: 600 fpm
TO run: 150 ft
Ldg roll: 100 ft

Invader Mk.IV Sail
Engine: Rotax 277, 28 hp
Prop: 56 x 22
Wingspan: 36 ft
Wing area: 135 sq.ft
Empty wt: 225 lbs
Max wt: 450 lbs
Cruise: 40 mph
Stall: 27 mph
Vmax: 60 mph
ROC: 600 fpm
TO run: 150 ft
Ldg roll: 100 ft

Designed and built in Belgium by Erik Reynders as a low-cost homebuilt microlight aeroplane, the first Calypso was a single-seat which first flew in October 1994. Construction of about 24 airframes of the Calypso in single seat or two seat configuration were started by 2004, of which 14 were ready to fly in that year.

The homebuilt kits of the Calypso are produced by Ultracraft in Heusden-Zolder, Belgium. The kit delivered to a customer includes a completed airframe of welded chrome-molybdenum steel tube, and an aluminium cockpit. Composites and wood are used in the aircraft and its wings. Power-unit options include the 2-stroke Rotax 582 and the 4-stroke Rotax 912 engine. The wings of the Calypso can be folded, which reduces the needed parking space in the hangar.

Engine: Rotax 447, 40 hp
Wing span: 8.65 m
Wing area: 11.5 sq.m
MAUW: 295 kg
Empty weight: 150 kg
Fuel capacity: 40-60 lt
Max speed: 155 kph
Cruise speed: 105 kph
Minimum speed: 50 kph
Climb rate: 3 m/s
Certification: Belgique
Seats: 1
Fuel consumption: 8 lt/hr
Price (1998): 630 000 FB

Centre mounted joy stick, rudder pedals, tail wheel steerable through rudder pedals.
Construction: Aluminium, Dacron, Chrome-moly

Engine: Kawasaki 440 (436 cc) 40 hp
Static thrust: 230 lbs
Wing span: 29’6”
Wing area: 147.5 sq.ft
Height: 6’
Length: 17’6”
Fuel cap; 5 USG
Empty wt: 261 lbs
Max wt: 500 lbs
Stall: 26 mph
Max speed: 64 mph
Vne: 75 mph
Climb rate: 650 fpm
Design limit: +6, -4g
Glide ratio: 8-1
Wing loading: 3.39 lbs/sq.ft
Power loading: 12.5 lbs/hp

Single seat single engined high wing mono¬plane with conventional three axis control. Wing has swept back leading and trailing edges, and constant chord; no tail, canard wing. Pitch control by fully flying canard; yaw control by tip rudders; roll control by spoilers; control inputs through yoke for pitch/roll and pedals for yaw. Wing braced from above by kingpost and cables, from below by cables; wing profile; single surface. Undercar¬riage has three wheels in tricycle formation; suspension NC on nosewheel and glass fibre suspension on main wheels. Push right go-¬right nosewheel steering connected to yaw control. Brake on nosewheel. Aluminium tube framework, with pod. Engine mounted below wing driving pusher propeller. Rudders and canard are covered in Stits polyriber fabric.

The prototype having made its first flights at the end of the summer in 1982. The prototype used a KFM 107ER motor which gives, according to Ultavia Aircraft, 25 hp at 6300 rpm and is becoming optional on the production models, the standard version coming with a Cuyuna 430R; a 2/1 reduction drive system for the 430R is also optional for $300 extra. The Ultavia is fitted with a yoke, rather than a stick. Its spoilers can be used differentially to control roll and together to act as air brakes. This machine comes as standard with a glass fibre nose cone, fitted with a Lexan transparent windscreen. The accent is put by the manufacturer on rapid rigging and de rigging, with single ¬surface resin impregnated Dacron wings which can be rolled up around the spars and stored in a bag, like a Rogallo wing. A genuine 15 min rigging time is claimed.

The Ultavia will be available during the summer of 1983, as a kit requiring 30h assembly at a price of $4595 (with a Cuyuna 430D) or factory built for $5395. A KFM 107ER engine costs $640 extra; an instrument panel is also available.

Engine: Cuyuna 430R
Max power 30hp at 5500rpm
Propeller diameter and pitch 54 x 17 inch, 1.37 x 0.43 m
Belt reduction, ratio 2.0/1
Power per unit area 0.19 hp/sq.ft, 2.1 hp/sq.m
Fuel capacity 5.0 US gal, 4.2 Imp gal, 18.9 litre
Wing span 32.0ft, 9.75m
Constant chord 5.0 ft, 1.52 m
Main wing area 155 sq.ft, 14.4 sq.m
Main wing aspect ratio 6.6/1
Nosewheel diameter overall 11 inch, 28 cm
Main wheels diameter overall 11 inch, 28cm
Empty weight 230 lb, 104kg
Max take off weight 480 lb, 217kg
Payload 250 lb, 113kg
Max wing loading 3.09 lb/sq.ft, 15.1kg/sq.m
Max power loading 16.0lb/hp, 7.2kg/hp
Never exceed speed 55mph, 88kph
Stalling speed 24mph, 39 kph
Best glide ratio with power off 10/1
Take off distance 150 ft, 45 m
Service ceiling 13,000 ft, 4000 m