König SD 570

König SD 570
Type	Two-stroke aircraft engine
National origin	Germany
Manufacturer	Dieter König; Compact Radial Engines

The König SD 570 is a four-cylinder, two-stroke, single ignition radial aircraft engine designed for powered paragliders, powered parachutes and single place ultralight trikes.^[1]^[2]

The engine was originally designed and produced by Dieter König of Berlin, Germany. The design was sold to Zanzottera Technologies of Italy and then sold again, along with the rest of Zanzottera's two-stroke ultralight aircraft engine line to Compact Radial Engines of Surrey, British Columbia, Canada.^[1]^[2] Compact Radial Engines was then in turn acquired by Fiate Aviation Co., Ltd. of Hefei, Anhui, China in August 2017. Fiate Aviation did not advertise the engine as available in 2021.^[3]

Development

The SD 570 is an unusual four-cylinder radial engine that is very compact and light weight at only 19 kg (42 lb). The engine features single capacitor discharge ignition, a single Bing 49 diaphragm-type carburetor and rotary valve induction. Compact Radial Engines offered it without a reduction drive, although when Zanzottera built it an optional 1.75:1 cog belt reduction drive was available. Starting is electric starter only and a recoil starter is not an option.^[1]^[2]^[4]

Earlier versions produced 28 hp (21 kW) at 4200 rpm with a slide-type carburetor and reduction drive. The Compact Radial Engines version is rated at 24 hp (18 kW) at 4200 rpm. Time between overhaul is rated as 300 hours.^[1]^[2]^[4]

The SD 570 shares the same bore and stroke as the smaller three-cylinder König SC 430 radial engine.^[2]^[4]

Variants

Zanzottera SD 570: Four-cylinder, two-stroke, single-ignition, radial aircraft engine producing 28 hp (21 kW) at 4200 rpm. Equipped with a slide-type carburetor and an optional reduction drive.^[1]^[4]
Compact Radial Engines SD 570: Four-cylinder, two-stroke, single-ignition, radial aircraft engine producing 24 hp (18 kW) at 4200 rpm. Equipped with a Bing 49 diaphragm-type carburetor and no reduction drive.^[2]

Applications

Specifications (CD 570)

Data from Compact Radial Engines^[2]

General characteristics

Type: Four-cylinder, radial two-stroke aircraft engine
Bore: 66 mm (2.60 in)
Stroke: 42 mm (1.65 in)
Displacement: 579 cc (35.33 cu in)
Dry weight: 19 kg (42 lb)

Components

Valvetrain: rotary valve induction
Oil system: premixed oil and fuel
Cooling system: air-cooled
Reduction gear: none

Performance

Power output: 24 hp (18 kW) at 4200 rpm

References

^ ^a ^b ^c ^d ^e Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page G-6 Cybair Limited Publishing, 2001. ISBN 0-9680628-1-4
^ ^a ^b ^c ^d ^e ^f ^g Compact Radial Engines Inc (2009). "SD-570, 4 cylinders 2 stroke; direct drive". Archived from the original on 16 October 2013. Retrieved 22 January 2010.
^ Fiate Aviation (2018). "Fiate Aviation". fiate.net. Archived from the original on 8 June 2021. Retrieved 23 November 2021.
^ ^a ^b ^c ^d Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 73. BAI Communications. ISBN 0-9636409-4-1