The Evolution TPS engine is an odd sized .455.

It is comparable to a standard .46 in terms of power.

The plane comes with a prop that purposely tones down the performance of the engine, for newbies, making the plane slow and easier to control.

Later you can change the prop to a standard 11x6, and the performance will increase greatly.

The TPS engine also has a removable 2oz flywheel on it. This helps to keep the engine rotating at idle, preventing deadsticks and engine outs.

The idea is to make the engine as newbie friendly as possible...

Unfortunately many of the engines arrive with the limiters set so the point you want to move the needle to, is just beyond what is permitted by the limiters... so most people end up removing the limiters.

My experience has been that about 70% of the PTS engines come with the limiters within the right range, and the other 30% require that the limiters been removed or reset to permit additional needle movement.

The Alpha is a great trainer plane. I selected it for my 10y daughter's trainer.

Getting it ready couldn't be simpler... just put it together, adjust the throws and surfaces, start the engine and tune, then fly.

No break in, etc.

Later change the prop, and it's a more sporty flyer.

The components will transfer to another plane later if desired.