My winter project will be a 1/4-scale Fairchild 24W, enlarged from 1/4,8 scale plans. (from 90" to 108" span)
The original plans was designed for a 1 cu.in. four stroke engine
What would theoretically the (four stroke) engine size be for the 1/4-scale model, in order to get the
corresponding performance? I assume there is a formula

Thank in advance,
/Leo