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Cheranovski BICh-7
 
 Cheran-Bich7-01
BICh-7
 
The BICh-7 (Russian: Черановский БИЧ-7) appeared as an enlarged BICh-3 development with a more powerful 100 hp Bristol Lucifer engine and the fuselage featured two open cockpits in tandem.
 
At the wingtips, on the upper surface, rudders were located with a curved leading edge.
 
The landing gear featured a single center wheel with skids on the tail section and near the wingtips. This landing gear proved ineffective, as did the dolphin-fin rudder.
 
Designed by Boris Ivanovich Cheranovski the BICh-7 was built at the Air Fleet Academy in 1929.
 
As a result, the plane did not take off. After several unsuccessful attempts, the model would be modified to give rise to the BICh-7A.
 
Based on the unsuccessful BICh-7, Cheranovski modified the cell to become a two-seater with a closed cabin. The rear cockpit fairing made a smooth transition to a rudder, which was very effective in this version. The BICh-7A (Russian: Черановский БИЧ-7A) signified the continuation of the development of the original Cheranovski parabolic scheme.
 
 Cheran-Bich7-02
Cheranovski BICh-7A
 
Like most of Cheranovski's designs, the BICh-7A was built entirely of wood with a fabric covering.
 
The cabin on this model appears closed and ends at the rudder. The wing, with a thick profile, presented an area increased to 30 m².
 
Another notable feature was the modification of the landing gear to a conventional two-wheel configuration with independent landing gear and tail skid.
 
The wing profile was also slightly modified and the system of ailerons and elevons installed on a bar located near the trailing edge of the wing intrados was introduced. This configuration had been successfully tested on the BICh-5 during the experiments carried out in the TsAGI wind tunnel and resulted in an increase in the effectiveness of these surfaces and in the maneuverability of the aircraft.
 
 Cheran-Bich7-03
Cheranovski BICh-7A.
 
The BICh-7A was completed by 1932. The tests carried out in 1932 confirmed the expectations of its builder.
 
The flights carried out by the pilot NP Blagin showed that the new airplane responded positively to the controls and presented good stability both longitudinally and during turns. These flights reached a maximum speed of 165 km / h with a ceiling of 5000 meters. Landing speed remained in the range of 70 - 75 km / h.
 
The main problem with the BICh-7A was its engine. Attempts to install a more powerful 140 hp three-cylinder Bristol Lucifer unit brought no improvement. During the flights the pilot was forced to adjust the power to 100 hp due to the appearance of strong vibrations. Low engine power and the use of an imported engine limited the model's production possibilities. The M-11 domestic engine was never tested in the BICh-7A.
 
The excellent results of the BICh-7 would lead Chizhevski to develop in the Bureau of Special Constructions (BOK) a model of a flying wing that was known as BOK-5.
 
BICh-7
Engine: 1 Bristol Lucifer 100 hp
Wingspan: 12.20 m
Wing área: 30.00 m²
Length: 4.74 m
Empty weight: 612 kg
Maximum takeoff weight: 865 kg
Wing loading: 29.0 kg / m²
Power load: 8.7kg / hp
Fuel capacity: 93 kg
Payload capacity: 253 kg
Maximum speed: 165 km / h
Landing speed: 70 km / h
Seats: 2
 
BICh-7A
Engine: 1 Bristol Lucifer 100 hp
Wingspan: 12.20 m
Length: 4.74 m
Height: 2.40 m
Wing area: 30.00 m²
Empty weight: 627 kg
Maximum takeoff weight: 880 kg
Wing loading: 29.3 kg / m²
Power load: 8.8kg / hp
Fuel capacity: 93 kg
Payload capacity: 253 kg
Maximum speed: 165 km / h
Cruising speed: 138 km / h
Landing speed: 70 km / h
Practical range: 200 km
Practical ceiling: 5000 m
Seats: 2
 
 Cheran-Bich7-04
BICh-7A
 
 
 
 
 


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