The Zenoah 34 sounds like a pretty decent amount of power for the Rascal. I would recommend going with something in the recommended range for the engine, but go for the low pitch side of the range. A lower pitch prop will limit your top end speed a bit (which doesn't sound like a problem) and will act as a bit of a brake on your landing approaches. This is actually an important consideration with the Rascal 110. It is so light, and has such a big wing, that it doesn't take too much power to hold altitude. With a big engine and a high pitch prop, you have a serious risk of not being able to slow down enough to lose any altitude when you want to land! A lower pitch prop can really help steepen your approach to something manageable.

I should point out that the person at Sig that designed the Rascal (and the wing) was really into gliders before designing the Rascal, so he used a combination of two airfoils from his glider days for the Rascal wing. Some of those glider genes show through once in a while.

It's an awsome plane though. I highly recommend it. It slows down so much on approach that you'll have all the piper cubs at your field passing you, but it's a clean efficient design so if you put a lot of power up front you can easily hit 80-90 mph on the top end. Put a big roaring engine up front and do some huge swooping aerobatics and you have a really awsome looking and sounding airplane in the sky that slows *way* up for landing.

Curt.