Zenair CH640


The Zodiac CH 640 Chris Heintz design is a four-place, low-wing, all-metal kit aircraft.  The CH 640 is a conventional four-seater, with a 2 + 2 seating configuration. The prototype aircraft is powered by a 180-hp Lycoming O-360 engine. The design features a fixed tricycle landing gear, large dual gull-wing doors, a wing span of 31.5 feet and an overall length of 23 feet. The Zodiac CH 640 is designed to bridge the gap between utility designs and the fast and expensive composite designs - to make it a practical and useful aircraft for the "average" pilot/builder. The CH 640 has a useful load of 1,000 lbs., making it a true four-seater. Heintz used the Zenith CH 2000 as the basic platform for his new design since the aircraft already boasted a huge cabin area, and the type-certificated design could easily be stretched into a four seater. Starting with a basic CH 2000 fuselage assembly, the CH 640 started to take shape by stretching the cabin area and adding the rear seat. New wings and horizontal tail sections were also developed, and the firewall-forward side was borrowed from the Heintz’ STOL CH 801 design which utilizes the same engine. The new airframe took just three months to put together. The CH 640 has conventional all-metal construction adapted for quick and simple kit construction. Kit parts are supplied ready-for-assembly, using blind rivets extensively. Many of the kit parts are the same design as the production Zenith CH 2000, which is being produced under an FAA production certificate.

Engine: Lycoming O-360, 180 hp
Prop: Sensenich 76-EM8-0-63
Max. Engine Wt: 440 lbs/200 kg
Power: 150 - 240 hp
MTOW: 2,200 lbs/1000 kg    
Design Ult.Load:     + 5.7, - 2.9 G
Max. Wing Loading: 14.6 psf/71.4 kg/sq.m
Max. Flap Speed: 115 mph/185 km/h
Max. Cruise Speed  -  Vc: 160 mph/256 km/h
Vne: 175 mph/280 km/h        
Empty weight: 1,200 lbs.
LSA: yes
Cockpit width: 46 in
Performance @ 1718 lbs
Max Level Speed: 167 mph/267 km/h
Cruise (75% 7,000 Ft.): 154 mph/246 km/h
Stall Speed (Flaps Down): 40 mph/65 km/h
Stall Speed (Flaps Up): 50 mph/81 km/h
Rate Of Climb: 1,400 fpm/7.0 m/s
Service Ceiling: 16,000+ ft./4880+ m.
Endurance (Standard): 3 Hrs. 45 min
Range (Standard): 525 sm/845 km.
Take-Off Roll: 950 ft./260 m
Landing Roll: 800 ft./244 m.
Performance @ 2200 lbs
Max Level Speed: 157 mph/251 km/h
Cruise (75% 7,000 Ft.): 150 mph/240 km/h
Stall Speed (Flaps Down): 47 mph/76 km/h
Stall Speed (Flaps Up): 58 mph/93 km/h
Rate Of Climb: 950 fpm/4.8 m/s
Service Ceiling: 12,800 ft./3,900 m.
Endurance (Standard): 3 Hrs. 45 min
Range (Standard): 510 sm/820 km.
Take-Off Roll: 990 ft./300 m
Landing Roll: 1,150 ft./350 m