Cuyuna 340 & 430 | |
---|---|
Type | |
National origin | United States |
Manufacturer | Cuyuna Development Company |
First run | 1979 |
Major applications | Pterodactyl Ascender |
Unit cost | US$800 (1980) |
- Cuyuna 430 Service Manual 2017
- Cuyuna 430 Service Manual 2016
- Cuyuna 430 Service Manual Download
- Cuyuna 430 Service Manual Pdf
Cuyuna 430 R/D Pdf User Manuals. View online or download Cuyuna 430 R/D Service Manual.
- Troubleshooting the Cuyuna 430R ultralight aircraft engine. Part of the growth of the ultralight industry can be attributed to the availability of light weight but powerful two stroke engines. One such engine was the Cuyuna 430 R. In its hay day the Cuyuna was used by most of the leading manufacturers.
- Brand new OEM type 2 ring pistons for your 430, pins and circlips included plus a major OH gasket and seal kit as shown. This set fits all 430 & 440 cuyuna 2SI including the UL and ULII-02series. Std bore 67.5mm. O/S are available in another listing.
- Brand new OEM type 2 ring pistons for your 430, pins and circlips included plus a major OH gasket and seal kit as shown. This set fits all 430 & 440 cuyuna 2SI including the UL and ULII-02series.1st oversize bore 67.75mm. Includes world wide priority mail shipping.
The Cuyuna 430 and Cuyuna 340 are a family of two-stroke, twin-cylinder piston snowmobile engines that were redesigned to serve as ultralight aircraft powerplants.[1][2]
Development[edit]
While developing the Pterodactyl Pfledge flying wing ultralight in the late 1970s, designer Jack McCornack experimented with a number of possible engines. Early flights used a German-made Sachs engine, but the high exchange rate and long lead times for this engine convinced him to try other options.[2]
McCornack settled on a snowmobile engine produced by the Cuyuna Development Company as having the best potential. In 1979 he modified the engine with a crankcase extension, an additional main bearing, lowered the compression ratio using an additional head gasket and substituted a smaller 32 mm (1.26 in) Mikuni carburetor, amongst other modifications. The original snowmobile engine produced 40 hp (30 kW). Lowering the compression ratio not only de-rated the engine, but also made pull-starting easier and allowed it to run on lower-octaneregular auto fuel. The resulting engine worked well, was de-rated to produce 30 hp (22 kW) at 5,500 rpm and proved reliable in service.[2]
Cuyuna 430 Service Manual 2017
Citing liability concerns over producing a two-stroke engine for human-carrying aircraft applications, Cuyuna declined to produce the modified engine. Instead, Cuyuna decided that the resulting engine was different enough from the base snowmobile engine that they would supply assembled and test-run shortblocks as parts to McCornack's company, Pterodactyl Limited, who would then complete the engines and be the manufacturer, allowing Cuyuna to continue producing snowmobile engines.[2]
After two years of poor sales of snowmobiles, due to a dearth of snow and no lawsuits against Pterodactyl Limited regarding the engine, Cuyuna agreed to build the engines themselves.[2]
The 430 was also produced in a reduced 2.362 in (60.0 mm) bore version called the 340. The modification reduced its displacement to 339 cc and output to 25 hp (19 kW) at 5500 rpm. The standard 430 has a bore of 2.658 in (67.5 mm).[1]
Variants[edit]
- 340D
- Direct drive version, 25 hp (19 kW) at 5500 rpm, recoil starter.[1]
- 340R
- Reduction drive version using a belt drive system, 25 hp (19 kW) at 5500 rpm, recoil starter[1]
- 430D
- Direct drive version, 30 hp (22 kW) at 5500 rpm, recoil starter.[1][2]
- 430F
- Reduction drive version using a 3:1 gearbox system, dual carburetors, producing 45 hp (34 kW).[3]
- 430R
- Reduction drive version using a belt drive system, 30 hp (22 kW) at 5500 rpm, recoil starter[1][2]
- UL II
- 35 hp (26 kW) version
Applications[edit]
Specifications (430D)[edit]
Data from Cuyuna[1] & McCornack[2]
General characteristics
- Type: Direct drive two-stroke piston aircraft engine
- Bore: 2.658 in (68 mm)
- Stroke: 2.362 in (60 mm)
- Displacement: 428 cc (26.11 cubic inches)
- Dry weight: 65 lb (29 kg)
- Designer: McCornack/Cuyuna
Components
- Fuel type:Regular auto fuel
- Oil system: 40:1 premixed fuel and oil
- Cooling system: fan forced air
Performance
- Power output: 30 hp (22 kW)
- Compression ratio: 12.5:1
- Power-to-weight ratio: 0.46 hp/lb (0.76 kW/kg)
References[edit]
Cuyuna 430 Service Manual 2016
- ^ abcdefgCuyuna Development Company: Cuyuna Engines, Cuyuna Development Company, undated
- ^ abcdefghMcCornack, Jack (Fall 1980). 'The Cuyuna 430D Experimental Aircraft Engine, Ptimes Vol 2 No 1'(PDF). Archived from the original(PDF) on 2011-07-16. Retrieved 2009-09-29.
- ^Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page D-17. Cybair Limited Publishing, 2001. ISBN0-9680628-1-4
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Cuyuna 430 Service Manual Download
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