Technical details
last update February 1, 2004                                file name: drawings.html
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The best drawing available of TsKB-15 comes from an old Modelist Konstruktor magazine.
See the sites  or too, where scans of these drawings (as many other ones) are available. This latest site has scans of fair drawings from Aviacia n.12, representing all the prototypes and the preliminary drawings.
If printed with the appropriate resolution of 174 dpi by a photo-retouch program, the drawings reported below are in 1/72 scale, except for some enlarged details that are in 1/36 or 1/18 scale, respectively where is written 1:20 and 1:10 on the original 1:40 drawing.
Disappointingly, there are not so good drawings of the TsKB-19 available on bibliography.

1      - Engine “Hispano-Suiza 12YBRS”
2      - Oil tank
3      - Cockpit canopy
4      - Accumulator
5      - Extractable water cooler
6      - Oil cooler
7      - Spar of the wing, welded from steel tubes
8      - Machine gun ShKAS
9      - Fuel tank (hermetic wingtips)
10    - Airscrew section (polished metal, the back side of blades painted in dark-blue color)
11    - Rope for undercarriage retraction
12    - Removable door (both left and right)
13    - The boundary of blue and red colors painting (the plane is painted in red, the engine cowling and the airscrew disk –blue)
14    - Leading rod
15    - Slider
16    - Direction of undercarriage during the retraction
17    - Opening for the cockpit panel illumination (both left and right)
18    - Swing of the fin
19    - Rope with roll for retraction of undercarriage
20    - Braking rope


The I-17 had many in common with I-16 regarding the construction.
The fuselage was wooden, semi-monocoque. The frame of fuselage consisted of plywood ribs and four main spars ending in the nose with steel joints for installation of engine section.
The central wing section was skinned by plywood and formed integral with the fuselage. The removable outer sections of wings were joined to the central wing section. Both wing spars were made from steel tubes, the wing ribs were made of duralumin. The wooden wing tips were fixed by rivets to the wing ribs. The upper surfaces were fabric-skinned, carefully prepared and painted.
The ailerons and tail unit were of metal construction, fabric-skinned.
The main undercarriage of TsKB-15 was similar tho that of I-16, with mechanical retraction by  metallic wires acting translating the main legs roots; it was not reliable nor simple, so a more modern pneumatic undercarriage was developed for the TsKB-19.
The powerplant of the TsKB-15 consisted of a V-shape twelve-cylinders liquid-cooled engine.
One water cooler was extractable from the fuselage undersurface.
On TsKB-19, two lowerable underwing coolers were installed instead of this central one.
The airscrew was with fixed step, as on most fighters of its age.
On TsKB-15, all four weapons were installed in the outer section of the wings, as on TsKB-19.
On TsKB-19bis, one 20 mm cannon ShVAK had been installed in the interstice of cylinders of V-shape engine, and two ShKAS machine guns in the wings.

Translated from Modelist Konstruktor by Audrius Nairanauskas
The Hispano-Suiza 12Y engine powered the TsKB-15.
It was a 36 l engine with 12 cylinders, rated at 760 HP. It was considered rather heavy (470 kg) for its power.
Subcessive versions of HS-12Y were used on French fighters as MS-406 and D-520.
Some versions of the Hispano-Suiza 12 were equipped with a gun between the cylinders banks and firing through the propeller shaft.
This photo is from rear/above.
The HS 12Y was built under license in Soviet Union as Klimov M-100, and gave origin to the M-103, 105 and 107 too.
This photo represents the M-100 engine equipping the second prototype TsKB-19.
Some pieces, as the propeller shaft, are missing.
The underwing coolers of TsKB-19 and 19bis were partially retractable into the wing undersurface.
When in semi-retracted position, the coolers appeared  covered with an aereodynamic cowling.
The cooler can traslate vertically on fixed rails thanks to four small rollers on each side.
When in lower position, the cowling was separed from the wing undersurface, and the cooler sides and rails were partially visible.
Connections were provided for flexible pipes for coolant.

(drawing from Aviacia n.12)

The main undercarriage of TsKB-19 and 19bis was inward retractable, and actioned by a pneumatic actuator.
Reinforcing struts were provided behind and on the outer side of each main leg; the outer strut was hinged to a triangular strut hinged in the wing bay.
The main legs were provided with covers and outward foldable flaps for the wheels actioned by a thin leverism, as on I-16.
The doors are omitted in front drawing.

(drawing from Aviacia n.12)

A ski undercarriage was developed for TsKB-19.

(drawing from Aviacia n.12)

I-17 index
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technical details
Building the Amodel Kit
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