I'll say! I've seen you fly so slow that a 20 minute flight takes over an hour!

I would say to wiegh both engines and see what the wieght penalty is for the larger one. If there isn't one or it's next to non-existent, then go with the .61 and carry that ace in your back pocket for the entire flight (should you ever need to use it). If you want, I can bring a small scale home from work to wiegh them both. Besides, I still need to get you that prop for the cub.

Andy