Piston

Zanzottera MZ 34 / MZ 35 / Compact Radial Engines MZ 34 / MZ 35

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The Zanzottera MZ 34 and MZ 35 are a family of single-cylinder, two-stroke, single ignition aircraft engines designed for powered paragliders, one and two place powered parachutes, single place ultralight trikes, light single place ultralight aircraft and motor gliders.

The engine was originally designed and produced by Zanzottera Technologies of Italy, but the design was sold, along with the rest of the company’s two-stroke ultralight aircraft engine line to Compact Radial Engines of Surrey, British Columbia, Canada.

The MZ 34 and 35 both have a cylinder barrel that is Nikasil-coated. The engine features a decompression channel to allow easier recoil starting, a tuned exhaust system and a belt-type reduction drive. Starting options include a recoil or electric starter.

Earlier versions produced 26 hp (19 kW) at 6250 rpm or 38 hp (28 kW) with a tuned exhaust at 6450 rpm. The current production engine is rated at 27.5 hp (21 kW) at 6250 rpm. Reduction ratios available are 1.84, 2.05, 2.14, 2.24 and 2.34 to 1.

The unit cost for the MZ 34 in 2009 was US$2840, and the MZ 35 US$3120.

The owners manual acknowledges the limitations inherent in the design of the engine, stating:
This is not an aeronautics approved engine.
This engine has not been subjected to durability and safety tests in compliance with aeronautical standards. It is designed to be used in paramotors and ULM or aeroplanes where engine failure will not produce serious consequences. The user must assume responsibility for all risks deriving from the use of this engine and must understand that this engine is subject to sudden failure. Engine failure may result in an emergency landing. Such accidents may cause serious material damage and injuries. Never use an aircraft fitted with this engine in areas or at conditions and altitudes which may cause problems if forced to land as a result of sudden engine failure.

Variants:

MZ 34
Single cylinder, two stroke single ignition aircraft engine optimized for powered paragliders, one and two place powered parachutes, single place ultralight trikes, light single place ultralight aircraft

MZ 35
Single cylinder, two stroke single ignition aircraft engine with a narrower profile, optimized for motor-gliders

Applications:
Aviastroitel AC-5M
Belite Aircraft Superlite
The Butterfly Super Sky Cycle
Earthstar Thunder Gull
Fly Products Power
North Wing ATF
Paramotor Inc FX5
Spartan DFS Trike

Specifications:
MZ 34
Type: Single cylinder, two-stroke aircraft engine
Bore: 76 mm (2.99 in)
Stroke: 69 mm (2.72 in)
Displacement: 313 cc (19.10 cu in)
Length: 296 mm (11.65 in)
Height: 410 mm (16.14 in)
Dry weight: 17 kg (37 lb) with engine mount and silent-block mountings, starter motor, manual starter, reduction drive and muffler
Valvetrain: Reed valve induction
Oil system: 50:1 oil to fuel, premixed
Cooling system: air cooled
Ignition: Electronic
Reduction gear: Poly-V Belt drive with optional ratios of 1.84, 2.05, 2.14, 2.24 or 2.34 to 1
Power output: 27.5 hp (21 kW) at 6250 rpm
Max torque: 35 hp at 4100 rpm
Compression ratio: 9.6:1
Price 1998: 149 00 Fttc

Zalewski WZ-V

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In September 1916 Imperial Russian Army opened a contest for a design of a three-seat army co-operation aircraft. Zalwski designed a quadruplane (which he designated WZ-V) that was to be built at Kiev, but overall situation made it impossible. The designed aircraft had a crew of three (two seating abreast in the front cockpit plus gunner behind them), a wooden construction and 220 hp Renault engine.

Zalewski WZ-I

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In 1909 the then-17-year old student of engineering Władysław Zalewski begun designing an airplane being essentially a scaled-down Farman. In 1911 he proceeded to construction works but financial constraints caused a break until 1913 when they resumed only to be interrupted again year later by the outbreak of the Great War, this time for good. Interestingly, already built elements managed to survive the war and years later some of them were used in construction of another Zalewski’s aircraft, the WZ-XI/XII.

Yurev 1912 Helicopter

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Student of the Moscow Technical College (МВТУ), Борис Николаевич Юрьев (Boris Nickolaevich Yurev) was the inventor of an automatic pitch-control mechanism, but because of lack of funds this full scale model was built without an engine nor pitch-control mechanism. Later however, a 30 hp Anzani radial was installed yet the machine remained without the poorly working pitch-control, which was used only on rotating tests. Considered to be the first modern helicopter with a single main rotor and a tail rotor.

Yunker Y-1 / Y-2

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Designed by Felix Knoll during 1929-1930, the Y-1 and Y-2 were three place open cockpit biplanes.

The Y-1 N421N c/n 1 was powered by a 165hp Warner. When the company floundered it sold for a whole dollar ($1) to Carrol Beckwith of Larned KS. The registration was cancelled by CAA 7 January 1933 after he informed them it was dismantled.

The Y-2 N490N c/n 2 was powered by a165hp Wright R-540A. the Y-2 crashed on 27 March 1930 and its registration was cancelled.

Yue No.2 / Ru, Feng No. 2

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Feng Yue #2 at the National Aviation Museum in Nanking.

Although the “Feng Ru No. 1″ airplane was damaged during the first test flight, it can be proven that it flew, and the Chinese immigrants in the USA were legitimately very proud. They continued to support Feng Ru’s airplane endeavors, and in January 1911 Yue started his new airplane”Feng. 2” in Oakland.

Yue launched his second airplane above the Piedmont hills on September 21, 1909. The Feng Yue #2 was Curtiss-like, but had some differences in the front elevator assembly.

This was the first airplane manufactured by an Oakland resident to fly in that area. Unfortunately, this airplane crashed as well after a twenty minute flight when the bolt holding the propeller shaft broke. Fong continued building planes, and in 1911, his plane stayed in the air for 40 minutes and landed without a mishap.