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Diehl Aero-Nautical XTC



Single-seat single-engined mid-wing monoplane with conventional three-axis control. Wing has swept back leading edge, swept forward trailing edge, and tapering chord; two-fin tail and canard wing. Pitch control by fully flying canard; yaw control by fin-mounted rudders; roll control by one-third span spoilers; control inputs through stick for pitch/roll and pedals for yaw. Cantilever wing; wing profile double-surface. Undercarriage has three retractable wheels in tricycle formation; steel-spring suspension on all wheels. Push-right go-right nosewheel steering connected to yaw control. Individual brakes on main wheels. Glass-fibre fuselage partially enclosed (total enclosure optional). Engine mounted above wing driving pusher propeller. Composite foam/glass-fibre construction with spars in carbon fibre.

The appearance of the world's first purpose-designed amphibious ultralight created quite a stir when it appeared in prototype form at the '82 Oshkosh and it has continued to attract great interest ever since.

This composite construction machine has floats at its wing tips and the entire fuselage forms a hull. The main wheels of the XTC Hydrolight retract sideways and outwards and the nosewheel retracts forward, nestling in the nose of the fuselage. Foot-operated individual main wheels brakes are fitted.

Though originally fitted with a twin-cylin-der Cuyuna 430RR and later with the Kawasaki TA440 developing 39 hp at 6000 rpm, the XTC Hydrolight is now normally supplied with the KFM 107 engine. The title stands for Cross-Terrain Craft and, according to its constructor, is pronounced 'ecstasy'!

To allow trailer transport, the outer wing sections are removable, rigging time being quoted as 10 min with one person. The aircraft is supplied in kit form, requiring some 100 h for completion, for around $6000 in 1982, the exact price depending on the options selected from a long list including bubble canopy, parachute systems, lights, instruments, skis, Tedlar wing covering and a trailer.


Powered by a Rotax 447 it cruises at around 45-50mph at only 4700rpm and uses around eight litres per hour. You can up the cruise to 60-65mph. The hull is constructed of fibreglass and Kevlar, the wing has a fibreglass D-section leading edge and covered with sail cloth, and a carbon fibre capped spar. Wing attach fittings are titanium, and with extensive use of stainless steel and anodised aluminium in a majority of the rest of the metal fittings this is a very low maintenance airframe even if operated in the sea.


Engine: KFM 107, 25 hp at 6280 rpm.
Propeller diameter and pitch 52x22 inch, 1.32x0.56m.
V-belt reduction, ratio 2.1/1.
Max static thrust 170 lb, 77 kg.
Power per unit area 0.16 hp/sq.ft, 1.7 hp/sq.m.
Fuel capacity 5.0 US gal, 4.2 Imp gal, 18.9 litre.
Length overall 15.2 ft, 4.62 m.
Height overall 4.8ft, 1.44m.
Wing span 32.0ft, 9.75m.
Chord at root 5.0ft, 1.52m.
Chord at tip 3.0ft, 0.91m.
Dihedral 3 degs.
Canard span 12.0ft, 3.65m.
Canard chord 2.5 ft, 0.76 m.
Fin height 3.0 ft, 0.91 m.
Total wing area 155 sq.ft, 14.4 sq.m.
Main wing area 128 sq.ft, 11.9sq.m.
Canard area 27.0 sq.ft, 2.5 sq.m.
Total spoiler area 4.0 sq.ft, 0.37 sq.m.
Fin area 10.0ft , 0.93 sq.m.
Rudder area 8.0 sq.ft, 0.74 sq.m.
Main wing aspect ratio 8.0/1.
Wheel track 6.3ft, 1.93m.
Wheelbase 10.2ft, 3.09m.
Nosewheel diameter overall 11 inch, 26 cm.
Main wheels diameter overall 11 inch, 26 cm.
Floats, dimensions 2.4 x 14.0 ft, 0.71 x 4.26 m.
Empty weight 247 lb, 112kg.
Max take-off weight 500 lb, 227kg.
Payload 253 lb, 115kg.
Max wing loading 3.22 lb/sq.ft, 15.8 kg/sq.m.
Max power loading 20 lb/hp, 9.1 kg/hp.
Load fac-tors +4.0, -4.0 design; +8.0, -8.0 ultimate.
Max level speed 62 mph, 100 kph.
Never exceed speed 80 mph, 129 kph.
Max cruising speed 60 mph, 97 kph.
Economic cruising speed 50 mph, 80 kph.
Stalling speed 25 mph, 40 kph.
Max climb rate at sea level 600 ft/min, 3.1 m/s.
Min sink rate 250 ft/min at 37 mph, 1.3 m/s at 59 kph.
Best glide ratio with power off 14/1 at 40 mph, 64 kph.
Take-off distance 100 ft, 30 m.
Land-ing distance 200 ft, 60 m.
Range at average cruising speed 120 mile, 193 km.

Engine: KFM 107 ER, 22 hp.
2.1:1 reduction belt drive.
Wingspan 32ft.
Wing area 150 sq.ft.
Aspect ratio 6:1.
Length 14ft.
Empty weight 280 lbs.
Payload 250-lbs. pilot plus fuel.
Wing loading 3.2 lbs/sq.ft.
L/D 16:1.
Cruise speed 50 mph.
Stall speed 26 mph.
Vmax 60 mph.
Climb rate 600 fpm.
Fuel 5 USgal.

Engine: Rotax 447, 43 hp.
Cruise: 30-50 mph.
Stall: 26 mph.
Fuel consumption: 6.5-7 lt/hr.
Top speed: 70 mph.
Endurance: 4.5 hours.


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