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Cheranovski BICh-2 / AVF-15
The Cheranovski BICh-2 (Russian: Черановский БИЧ-2) was the second glider of the “Parabola” family designed by BI Cheranovski. Generally similar to the previous BICh-1, it featured a larger wing area and an empennage directly behind the cockpit.
A slightly larger version, the new glider was built in the workshops of the Air Fleet Academy where it was given the sequential number AVF-15 and its designer would call it BICh-2.
The BICh-2 glider was designed as a single-seater flying wing built entirely of wood, with a textile covering.
Like Cheranovski's first design, the BICh-2 featured a thick wing (400mm at its thickest) with a parabolic leading edge and a thin trailing edge with control surfaces along the entire span, made up of elevons. As a fundamental difference with the first model, we can highlight the increase in the wing area by more than 1.5 times and the introduction of a vertical tail with rudder, just behind the cockpit and on the longitudinal axis of the aircraft. The wing was built using Pr-385 and Pr 436 profiles on a 10 x 8 mm pine slat structure. These slats formed a crossed lattice, fixed by glue and nails.
To facilitate movement, the wing structure was divided into three sections. Final assembly and fabric coating were done at the flight site.
The rudder was retained more out of a problem of tradition than necessity, as the ailerons provided all the necessary steering control.
The pilot was located in a cockpit in the frontal region of the model, practically hidden within the thick wing profile.
In the lower center line of the glider, a single wheel was fixed on a fairing pile, which guaranteed the necessary angle of attack to allow takeoff. Small curved skids were located at the wing ends and a conventional tail skid at the lower rear.
Only one was built, which participated in the Second National Sailing Competitions held in Koktebel in 1924 and it demonstrated good handling and stability. During the competitions and piloted by BN Kudrin, it made 27 flights, of which the most successful took place on September 20 with a maximum duration of 1 minute and 20 seconds.
The glider in the tests demonstrated ease in handling. On launching from the low heights of the lift, the Kara-Oba easily detached from the ground, glided downward at low speed and settled smoothly. Despite this, the pilots had doubts about the behavior of the BICh-2 in more complex maneuvers and its structural resistance, which is why it was never launched from the heights of the Uzun-Cyrt mountain. In this event the “Parabola would receive the award for the originality of its construction.
Wingspan: 10.00 m
Wing area: 20 m²
Length: 3.75 m
Height: 1.28 m
Rudder surface area: 0.8 m²
Aileron surface: 5 m²
Empty weight: 50 kg
Wing loading: 6 kg / m²
Accommodation: 1
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