Introduction
The logger/limiter plays a central role and is of paramount importance in F3G. The logger ensures that the drive parameters stipulated in the regulations are adhered to:
Maximum energy: 350 W/min
Maximum motor runtime: 30 seconds
and automatically shuts off the drive when these maximum values are reached.
Furthermore, the logger also measures the so-called "F5J altitude," which is important in duration. This refers to the maximum altitude the model reaches from takeoff until 10 seconds after the motor is automatically or manually shut off.
To ensure fair and equal conditions for all participants, only loggers tested and homologated by the EDIC (a sub-organization of the FAI) are permitted in the competition. This homologation always refers to a combination of logger, power sensor, and the associated software (firmware). Any deviation from this means that a non-compliant configuration is used, and the flight will be deemed invalid and awarded zero points.
The list of currently certified and approved loggers can be found on the FAI website under the heading F3G LOG Approval List.
Loggers, such as the Altis V4+ or SM Unilog2, still need to be configured for F3G competition mode using the manufacturer's software. Some loggers, e.g., the rc electronics Eagle F3X, have firmware specifically designed for F3G, which automatically sets the parameters for competition and cannot be changed by the pilot/participant.
In general, it's advisable not to view the logger solely as a "black box." All loggers offer additional functionalities and detailed information such as current, voltage, climb rates, etc., which provide valuable data for optimizing the drivetrain and flight tactics.
IMPORTANT Its the pilots responsibility to assure that the used logger/limiter is working and configured properly.
Currently certified / approved loggers for F3G - as of March 2026
As of March 15, 2026, the following loggers are certified for use in F3G and permitted in competition:
rc-electronics Eagle F3X with power sensor and firmware 1.3.5 -> More details
SM-Modellbau Unilog2 with F3G 150Ap power sensor and firmware 1.17j -> More details
Aerobtec Altis V4+ with power sensor and firmware 2.8 - The manufacturer has discontinued production of this logger -> More details