good answers -I suggested all materials - -some thought that meant structure only -I meant ALL material -engine/ covering -all of it -so 50% of original weight -
I think the plane could be good deal smaller as synergistically, the lighter plane would need far less lifting area- and OR less power for the same job
On models when we got into reduction of weight to meet class requirements - It quickly became evident that the wings could be smaller and or with much reduced airfoil thicknes as maneuvering all could happen at lower AOA- best yet - the speed could be selected - for windy or smooth air .