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Aermacchi 175 Chimera

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Aermacchi History | Harley Sprint History

The text this Aermacchi history is from a 1965 MOTOR ILLUSTRATED article by Carlo titled, AERMACCHI, the story of the best-selling boy-racer and posted on Italia

AERONAUTICA MACCHI abbreviated to Aermacchi) was founded in for the manufacture of seaplanes, which for the factory being conveniently on the shores of Lake Varese. It quite big during the First War and continued to concentrate on aircraft in the that followed.

The company one of the keenest contenders for the famous Trophy and among its outstanding was the fastest-ever Schneider race of 440 mph that the C-72 plane set up in During the Second World abandoning seaplanes, Aermacchi perhaps the finest of all fighters by the Italian air forces.

Soon hostilities had ended it was decided to peacetime production with a truck. This was unorthodox but good and is still being to this day. Then, the motor cycle boom and to have a stake in it, the Aermacchi looked for a good designer who produce an attractive lightweight.

choice was Lino Tonti, who had at Benelli and had worked on aircraft during the war.

1951 Monsone

Tonti’s first for Aermacchi, produced in 1950, was unorthodox. It was an open-frame lightweight a 125 cc two-… engine pivoting in with the rear suspension. The or tool container, shaped a fuel tank, had a hinged at the steering column so that it be fixed near the saddle to motorcycle minded users to grip with their

This machine enjoyed popularity and a sports version of it, had the frame “closed” by a real was used in trials, including the Six Days of 1951 and 1952. unsuccessful, on the contrary, was the 250 cc twin 125s coupled together) was produced in 1953-4.

In 1955 designed a record breaker, full use of wind tunnel and resources of the factory’s aircraft which had by then resumed of civilian planes. Powered by engines of 48 cc and 75 cc capacity, this was one of the examples of a “flying cigar”, very low and almost 10 ft. long. behind the driver, the engine had the of having its cylinder inclined at a angle of 20 degrees.

The overhead were chain driven, and … dimensions were mm by 43 mm for the larger version and 40 mm by 39 mm for the smaller: with a compression ratio of the power output was 9 bhp at 11,000 rpm for the 75 cc and 7 bhp at rpm for the 50 cc—quite good figures, the period and the poor petrol had to be used. The engine, which had wet lubrication, was in unit with a gearbox and final drive was by

Weight in running order was 214 lb. tires were employed and frame construction was used for the sprung body.

1956 75 cc record holder

The record were made early in on the Milan-Varese motorway. Neither nor road conditions were but the Aermacchi flying cigar, by Massimo Pasolini (father of the works rider, Renzo) a speed of 100.2 mph over the mile and 108.8 mph over the kilo, breaking, by a considerable the records set up only a few months by Germany’s Adolf Baumm in his NSU bedstead”. With the 50 cc machine, the mile record was broken, with a marked increase, at mph.

Soon after the successful bid Lino Tonti left to FB Mondial. One of the best men in Italy was to succeed him as technical director. was Alfredo Bianchi, previously Alfa Romeo and Parilla, and a keen motor cyclist before the war.

He had designed the ohc 250 cc sports and racing models were so successful in Italian just after the war, and had manufactured his own Astoria engines and machines, the single-ohc and two-… 125 cc and 175 cc; enjoying quite a lot of popularity as components for use by small manufacturers.

first task when he Aermacchi was to evolve a production from a sketch of an ideal which had been executed by Revelli, a well-known car stylist who had been a racing motorcyclist and had won the 1925 Italian GP at Monza on a GR of his own manufacture.

1958 250 cc Aermacchi

The new model, the all-enclosed 175 cc Chimera, was during 1956. But although it a considerable amount of interest the never sold well, on the home market or outside So it was decided to undress it to produce a orthodox motorcycle.

Bianchi back to his drawing-board, expressly to make as few changes as possible in to avoid further heavy costs. This explains the backbone and the horizontal disposition of the both obligatory features of the machine.

At a time when most designers regarded overhead as a must, even for touring Bianchi had given the Chimera a engine. This was in the interests of maintenance but he had backed his decision the contention that, even for sports models, there was no need for an ohc layout. And by now the strength of argument had been more proved by the success of the racing of the Aermacchi.

When first the Chimera was a 175 cc machine. But before a 250 cc version had also been So the Aermacchi also appeared in forms.

Before long sporting potential was being In 1957 a hotted-up 175 cc model, 15.5 bhp instead of the standard 13 bhp (at the same 8,000 rpm) was made available for use in Italian machine races. Since the performance of the 175 cc production racer has increased to 20 bhp—despite the fact development of this model has to be shelved in favour of the more 250.

This appeared than the 175, the prototype given its debut in the 1960 GP by Alberto Pagani. It made a good showing, up against the of the GP racers, that Aermacchi to go ahead with a small of similar machines for sale to owners.

1960 250 cc Aermacchi Ala

The first of these 250s, the Wing model as it is called, had the long-… 62 mm by 72 mm bore and … of the Chimera, had a four-speed gearbox and 22 bhp at 8,000 rpm. One of the few obvious was an increase in wheel size 17-in to 18-in.

The low initial cost of the Golden together with its ease of and ready availability of reasonably spares, made it immediately as a private-owner racer. And it was soon itself to be a mean performer, on short, twisting circuits its light weight and good paid off.

No doubt, it was the success of this model, the achievements of the scrambles version Angelini was five times champion on an Aermacchi) that led to embark on a 50/50 commercial with the Varese factory in With a lightweight boom in the U.S.A. America’s biggest badly needed a good 250 could be sold in sports, and moto-cross forms.

Aermacchi 175 Chimera

It has been a satisfactory venture for Aermacchi, and more of whose products are shipped across the Atlantic. year 75% of the factory’s production to Harley-Davidson for distribution in America and sales of the 50 cc moped have added to those of the 250s.

Aermacchi/Harley-Davidson M-50

The increased resulting from the merger Harley-Davidson has made it necessary to the motorcycle and aircraft companies in The aeroplane factory is in Varese while the old lakeside workshops been modernized and enlarged to the growing output of motorcycles.

By the end of it seemed to Alfredo Bianchi no more power could be form the longstroke 250, so he the bore and … dimensions to an 72 mm by 61 mm. Up went the power output to 28 bhp at rpm (more than the world winning double-knocker Guzzis and the adoption of a five-speed gearbox full use to be made of this in performance. For 1965 the power be up to 30 bhp at 10,000 rpm—not bad for a push-rod racer!

Alive to the fact that it be difficult to make much on this, Bianchi already had a new design on hand. But as Harley-Davidson are opposed to having a racer differs fundamentally from the machines—they even used one of the ohv Wing motors for their U.S. record-breaking cigar. The has had to be shelved.

1964 Aermacchi/Harley-Davidson record holder

Changes have been made to the Wing for 1965 mainly the transmission. A dry type multi-plate is being used instead of the wet previously employed and a more five-speed gearbox replaces year’s component. Sold the world, these Aermacchi are now being produced in greater than Manx Nortons, 7Rs or ever were.

The story of the 350 cc Wing is also of interest. It was envisaged to allow for competition in 500 cc and was devised at the end of 1962, by coupling a piston and cylinder to a long-… half.

The resulting 72 mm by 72 mm bore and measurements gave a displacement of 293 cc and machine, by virtue of its light and easy handling (like the recent ease of the BSA Victor) was successful in Italian moto-cross, two national championships for the factory Aermacchi dropped official in scrambles in order to concentrate on racers. Scrambles models in production in 250 cc (long-…) and 293 cc versions, the producing around 22 bhp and the larger one 25 both with plenty of coming in at low revs.

A 293 cc road racer was a natural from the moto-cross model. As it appeared, at the beginning of 1963, machine produced only more power than the 250, turning over at rpm. Then in 1964 it was to a real 350, with 74 mm by 78 mm and ….

This motor 33 bhp at 8,000 rpm and is on sale to the general with a sturdier five-speed and dry type clutch.

The racing for 1965 will be much the as last year. Renzo and Gilberto Milani, as works will perform the same of role as Norton team men the British factory adopted the of racing production Manx Alberto Pagani, on the other will ride a semiprivate with a new tubular space that he has built himself.

will participate in most of the meetings including some of the in Italy and abroad, in order to further data to enable Bianchi to improve still his over-the-counter racers.

Aermacchi is so far the Italian factory which has followed this policy in doing so, made a great to motorcycle sport throughout the

Originally Posted on Moto .

Aermacchi 175 Chimera
Aermacchi 175 Chimera

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