If that is the right boat, this is what the rule book says for the 1/10th scale class:
1) Power to be provided by a single motor meeting the following requirements:
2) ERCU approved motors shall be of an inrunner design and shall not exceed the following dimensions:
- Length: 60mm (2.362 inches).
- Diameter: 37mm (1.457 inches).
- No modifications are allowed to the motor except for except for normal wear, drive flats or keys, electrical connectors and water cooling, it must be run as shipped from the manufacturer.
- No modifications are allowed to the motor except for except for normal wear, drive flats or keys, electrical connectors and water cooling, it must be run as shipped from the manufacturer.
- Bearings may be replaced at any time