Just as you think you start to get to know a little about what is out there, the theory goes right out the window.

After speaking to the guy at the field with the Tiger and after reading all these posts, I sent an e-mail to our club president and asked for his opinion as he knows the fellow with the Tiger and knows a great deal about this hobby. He said to me that unless I want to do wild aerobatics and vertical climbs right after take off, then the .61FX will be a good choice the for Tiger and ample power.

So, having said all of this, I am not in the phase of doing any wild aerobatics. I would like to learn some aerobatics with the Tiger, but I am still learning being the most important point. This is only my second plane and my first low wing.

Thanks to all that have responded. I have learned a great deal about engines - so much so that my head hurts - and keep it coming. This is a fantastic way to learn.