
The Scott brothers and Dan Hanchette created the Viper Aircraft Company in 1995.
The ViperJet was the first two seater jet on the kit market in the USA. Originally designed to be equipped with a Continental TS10 520 engine with a 5-blade fan, the Mark I has a Turbomeca Marbore II or IV.

First flight with a Marbore VI was planned for October 1999.

The Marbore was to be eventually replaced by a General Electric J85 (military version of the CJ-610 of the Learjet 23) to give the Viper Mk II.

Prototype
Engine: Marbore VI, 1100 lb
MAUW: 3500 lb
Take-off SL (No flap): 2526 ft
Take-Off SL (10 deg.Flap): 1804 ft
Landing SL (Full Flap): 2624 ft
Max.Speed @ SL TAS: 370 mph
Max.Speed @ 10,000′ TAS: 391 mph
Max.Speed @ 15,000′ TAS: 404 mph
Max.Speed @ 25,000′ TAS: 416 mph
Max.Rate.Climb @ SL/260 mph: 4400 fpm
Seat: 2
Prototype
Engine: Marbore II, 880 lb
MAUW: 3500 lb
Take-off SL (No flap): 3516 ft
Take-Off SL (10 deg.Flap): 2418 ft
Landing SL (Full Flap): 2624 ft
Max.Speed @ SL TAS: 331 mph
Max.Speed @ 10,000′ TAS: 353 mph
Max.Speed @ 15,000′ TAS: 357 mph
Max.Speed @ 25,000′ TAS: 370 mph
Max.Rate.Climb @ SL/260 mph: 3100 fpm
Seat: 2
Engine: GE J-85-17A, 2850 lb
Cruise: 450 mph
Stall: 84 mph
Range: 1380 sm
Rate of climb: 10,000 fpm
Takeoff dist: 1200 ft
Landing dist: 2500 ft
Fuel capacity: 270 USG
Empty weight: 2750 lb
Gross weight: 5500 lb
Length: 25.5 ft
Wing span: 30 ft
Wing area: 130 sq.ft
Seats: 2 tandem
Cockpit width: 30 in
Landing gear: retractable nosewheel
LSA: no