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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsThere is no single “safe temperature” for an RC turbine jet. Exhaust-gas temperature (EGT), the turbine casing, an electric starter motor and the ECU battery are different components, measured in different places and governed by different limits. Use the manual for the exact turbine and ECU, and the battery maker’s instructions for the pack.
Which temperature are you checking?
On a turbine-powered RC jet, a temperature reading only makes sense when you know what is being measured and where. EGT is the hot exhaust gas monitored by the turbine system; it is not the surface temperature of the engine. A casing, starter motor and ECU supply battery each have their own operating conditions. Do not apply an electric model motor or battery rule to turbine EGT.
The exact turbine and ECU documentation governs operating and shutdown limits. For battery operating and charging temperatures, use the instructions for the actual battery model. The available manufacturer specifications do not establish a universal limit for every turbine casing, starter motor or ECU battery.
What EGT limits do manufacturers specify?
JetCat P250-PRO
JetCat’s P250-PRO V1-2 technical information, approximately 2020, specifies a maximum normal-operation EGT of 800°C and a maximum starting EGT of 900°C for three seconds. It also lists ambient-temperature ranges of −40°C to +50°C for starting and −50°C to +50°C for operation. These are limits for the named P250-PRO document, not battery, casing or starter-motor limits and not specifications for other turbines. JetCat manuals and technical information.
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ENJET E170
ENJET’s E170 product listing gives an EGT range of 600–850°C and recommends a 3S LiPo with at least 2200 mAh. The EGT range describes exhaust gas; the battery line describes a supply-pack specification. Neither establishes a general temperature cutoff for batteries or other engines. ENJET E170 product page.
Do not use one model’s published EGT as a target or allowable limit for another model. If a value appears abnormal or the ECU reports a temperature fault, stop and follow that system’s troubleshooting instructions rather than changing the operating limit based on a generic range.
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How to choose a compatible ECU battery
Battery configuration and battery temperature are separate questions. JetCat documentation illustrates why the exact ECU chart matters: P250-PRO technical information describes battery chemistry as selectable and identifies 3–4S LiPo or LiFePO4 as ideal for that model, while the BMS V1.0 manual describes a particular 3-cell 9.9V LiFePO4 pack and an alternative 2-cell LiPo. Those examples are not interchangeable recommendations for every ECU. JetCat model documentation and JetCat BMS instructions and downloads.
Before replacing a pack, check the ECU compatibility chart and compare the required chemistry, cell count and voltage, capacity, connector, and current or starting requirements. Also check the battery maker’s operating and charging temperature range. A specification such as “3S LiPo” is not enough to establish compatibility by itself.
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How to cool the turbine safely after a flight
Some turbine systems keep the ECU powered through an automatic cooldown and shut down only when that sequence finishes. JetCat describes automatic cooling and subsequent power-down for the P80-SE. Its BMS instructions also warn against disconnecting the battery after startup or while the engine is running. JetCat P80-SE information and JetCat BMS instructions.
- Use the shutdown sequence specified for your turbine and ECU version.
- Keep the required ECU supply connected while the prescribed cooldown is underway; do not interrupt the sequence by disconnecting the battery.
- Wait for the system’s indicated completion and automatic power-down, where that behavior is specified for your model.
Cooldown behavior varies by system, so confirm the exact manual rather than assuming every ECU behaves like the P80-SE.
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Charging and handling the battery
JetCat’s BMS V1.0 instructions warn that a LiPo or LiFePO4 battery can explode if charged with incorrect parameters. Use a compatible charger with the battery and charger makers’ specified settings, do not exceed the pack’s permitted charging current, and do not leave charging unattended. Follow the warnings and instructions supplied with the exact battery and charger. JetCat BMS instructions.
Temperature limits for charging and for operation may differ. Check the battery maker’s specified range for both conditions; do not treat a general hobby recommendation as a universal cutoff for every pack.
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