1" Fuel Injector of Soyuz-FG Rocket RD-107A RD-108A Engine in 3D Display

Description

Fuel Injector of Soyuz-FG Rocket RD-107A RD-108A Engine in 3D Display.
Fuel Injector from injector’s head mixture chamber of RD-108A rocket engine (14D21) from central and side Soyuz boosters, used on the Soyuz-FG (11А511U-FG), Soyuz-STA (372RN21A) and Soyuz-STB (372RN21B). 1 inch long, paper tag “D194-238"
attached
.
The injector places in 3 D display size 5.1/2” x 5.1/2” x 0. ¾”
Excellent condition.
Some information:
In development since around 1993, the new injector heads were designed to improve the mixing of fuel and oxidizer sprayed inside the combustion chambers of the modified RD-107A (14D22) and RD-108A (14D21) engines which propel the first and second stage, respectively. The older RD-107 (11D512) and RD-108 (11D511) engines used 260 two-component centrifugal injectors, while the new engines received more than 1,000 one-component injectors. They allowed finer aeration of propellant for more thorough burning of its components while also reducing the probability of high-frequency vibrations inside the combustion chambers. RD-107А (AKA 14D22) is an improved version of the 11D511 with new injector design that eliminated the high frequency combustion instabilities. Used on the Soyuz-FG RD-108А (AKA 14D21) is an improved version of the 11D511 with new injector design that eliminated the high frequency combustion instabilities.  Used on the Soyuz-FG (11А511U-FG), Soyuz-STA (372RN21A) and Soyuz-STB (372RN21B).
The letter of authenticity will be included.
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