I just purchased a used 90" Cub J3, perhaps 7 years old. It is a Great Planes kit build. I believe it is a 4.45:1 size. No manual or other documents to go by. Can anyone let me know the settings for the flight surfaces. It has a YS F91 engine in it. What is the prop nut size. this is my first YS engine. Thanks for any info.........DonU