The JPX D-320 and D330 are a family of French twin-cylinder, horizontally opposed, two-stroke aircraft engines.^[1][2]

The engine was introduced specifically for the powered paraglider market, as part of the company's comeback efforts following going out of business in the early 1990s.^[1] Production of the engine had ended by 2012.^[3]

Design and development

The engine has two cylinders in a horizontally opposed configuration, with cooling fins on the cylinders. The single ignition system uses capacitor discharge ignition. Fuel is metered by a single Tillotson carburetor. Starting is only by electric start, without recoil start as an option.^[1][2]

The D-320 has a redline rpm of 6600 and uses a belt reduction drive of 2.38:1. Its weight of just 36 lb (16 kg) gives the engine a high power-to-weight ratio.^[1][2]

Variants

D-320

Twin-cylinder, horizontally opposed aircraft engine introduced in the mid-1990s and currently out of production. Power output is 20 hp (15 kW) at 6600 rpm.^[1][2]

D330

Twin-cylinder, horizontally opposed aircraft engine, improved variant, currently in production. Power output is 20 hp (15 kW) at 6500 rpm.^[2]

Applications

• Alpaero Exel
• Alpaero Sirius
• Bailey JPX D330
• D'Yves Yvasion 2000
• Ekolot JK 01A Elf
• Reflex J 320
• Technic'air Fly Roller

Specifications (D330)

Data from JPX^[2]

General characteristics

• Type: twin-cylinder, two-stroke engine
• Displacement: 319 cc (19.47 cu inches)
• Dry weight: 15.5 kg (34 lb) complete with standard reduction drive, carburettor, air filter, electronic ignition, starter motor and exhaust system.

Components

• Valvetrain: 6-blade reed valve induction
• Fuel system: Tillotson carburetor
• Oil system: premixed 2.5% oil and fuel
• Cooling system: air cooled

Performance

• Power output: 20 hp (15 kW) at 6500 rpm
• Compression ratio: 8.5:1
• Fuel consumption: 2.5 litres to 6 litres per hour depending on load and cruising speed