Your question was not at all biased... I don't think there are any bad questions, only bad answers.

Just from my experience on the RCU forums, I see a lot of whining when it comes to engines. This makes sense due to the many issues that a combustion engine can have. I simply want people to get fair information...

I personally don't own a ST .51 but I'm sure they are great engines. Being ringed, it should last longer than an ABC. But the ABC engines will perform better from what I have experienced.

One thing that I would tell you is that from a support standpoint, Tower Hobbies will give you a 4 year warranty if you are a member (may be worth it to you, may not).

That said, I didn't say that I've never had problems with TH engines because I have. However, if you send it back they will take care of you. Other than that, it's personal preference...


I have a few electrics myself and enjoy them very much.

Hope this is helpful!