Claytucker....If I am correct, and downthrodden will correct me if I am wrong, he likes to fly the MAS13x5. I too flew this one and love it!! It sure was a great recommendation/combination! I have the Twist with a O.S. 61FX in it as well. I too fly, like Downthrodden, not really fast, but I love to fly by the stand as slowwwww as possible, so we can look at this bird in light!!

I used the 12.25x3.75 on the .46FX...although it made the Twist fly super slow, I personally thought it was a little bit too much labor for this engine. I have *knock on wood* never had a dead stick with any prop on the 61FX!! I love this engine!! I think the 12.25x3.75 will be slightly too small for the .61FX. Give the MAS a try....I think it will be a great match for the 61FX!