GSR-ST-18/70KIS

GSR-ST-18/70KIS purpose and operating modes

GSR-ST-18/70KIS combines engine starting and DC generation in one rotating electrical machine. In starter mode, electrical energy produces torque at the drive shaft; in generator mode, mechanical input is converted into electrical output for the aircraft network. The two duties have different current, voltage and time conditions. Their ratings are therefore separated in Technical Details rather than combined into a single operating range. The slash in 18/70 is retained as part of the product designation.

Power-supply application

The generator is described in the electrical system of the Yak-38 family as a DC source working alongside separate AC equipment and reserve batteries. The related equipment includes the GT16PCH8D AC generator and PO-750A and PT-500Ts converters. These units support different electrical networks; their presence in one aircraft does not make them alternatives to the DC starter-generator. General aircraft context is available in the neutral Yak-38 reference.

GSR-ST-18/70KIS regulation and protection

The electrical-equipment reference associates this generator with RUG-83T voltage regulation, TS-9MT stabilization, R-2A resistance, DKN-8 network-control equipment and AZPS-1 protection. Their functions complement the rotating machine: the generator produces power, while external equipment regulates its output and manages its connection to the electrical system. The associated apparatus is not an integral supplied kit. Exact execution and installation-specific wiring remain defined by the relevant aircraft electrical documentation.

Starter duty and mechanical output

Starting is a short-duration duty with a substantially higher current than normal generating operation. The existing technical data specify a current condition lasting up to forty seconds and a separate field-current value. Shaft torque is stated in kilogram-force metres, not kilograms of mass. The starter speed range describes the acceleration duty and must not be used as the continuous generator speed range. Cooling and duty-cycle conditions are consequently part of the machine's operating context.

Generator output and technical data

In generator mode, the card separates the nominal voltage from the voltage at which the stated power is specified. This avoids treating figures from different rating conditions as a single arithmetic operating point. Generator-mode shaft-speed limits are not inferred from the starter range. Numeric starting and generating data are grouped below, while other machines are available in the generators and starter-generators catalogue. The KIS designation identifies the combined cooling system in the source description.

Machine type: DC starter-generator
Operating modes: Engine starting; DC generation
Aircraft electrical-system reference: Yak-38 family
Cooling: Combined system, KIS execution
Starter voltage: 0–93 V
Starter current: 850 A, for up to 40 s
Starter field current: 21 A
Starter torque: 7.5 kgf·m
Starter shaft-speed range: 0–9,000 rpm
Generator nominal voltage: 28.5 V
Generator load current: 600 A
Generator rated power: 18 kW, specified at 30 V
Associated voltage regulator: RUG-83T
Associated stabilizing transformer: TS-9MT
Associated resistance: R-2A
Associated network-control equipment: DKN-8
Associated protection equipment: AZPS-1
AC generator in the aircraft-system reference: GT16PCH8D
Converters in the aircraft-system reference: PO-750A; PT-500Ts

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