I have flown mine with a YS 63, OS 91fs and Saito 91. At sea level on 15% nitro. except I used 20% with the YS. This is a 6 lb (more or less) plane. The profile guys are flying 4 lb Mojos with Saito 82s , some on 30% nitro. Right now I am flying it with my new Saito 91 that will go on my Mojo 60 as soon as I get comfortable with it. The UCD has been a very user friendly plane so I use it to check out new stuff.

I think the Saito 82 will work fine on the UCD 46.