Find my thread "Ultra Stick Lite done right" ... there it shows you how to build a 9+ pound USL lite... You can take a lot of weight out of it and it will remain strong and fly great.

Mine, with a G26 Gasoline engine (a lot heavier than a YS, etc) weighed well under 10 pounds. It is a rocket ship.. takes off in 10 feet and goes straight up!

DP