All .049s are not the same, even ones that look the same will have much different power outputs. The cylinders, fuel in use, backplates from a Baby Bee or a Black Widow, etc. Same for the rotarys as well.

The Quickie is a cool looking plane, and I have the plans from the magazine. No way I would build that here, the landings would end it's life Q U I C K L Y.