I have been running this engine for months now. This new generation long stroke provides superior power when using the Hatori SB-19 over the older generation YS 91.

The GY240 is the perfect choice for the beginner starting with the 30 sized helicopter. It is also a great choice for electric helicopters. I find that the pirouette rate is a little slow, but very consistent.

The GY401 has a very consistent pirouette rate and the tail holds excellent even in the most demanding backwards flights. The best part of this gyro is its simplicity as it has no amplifier unit. I would recommend this gyro to anyone, I have complete faith that they will feel the same as I do about the GY401.