very interesting info here, especially from orion. i understand he is no longer with us. i have tried a few models and hope to build a manned craft one day. what i am attempting is to have the cp move back as the craft climbs out of GE increasing stability and causing a descent. my most successfull model would fly hands off IGE and needed almost full up trim OGE. IMHO that is the only way to make safe wig. i do not use the reverse delta. any news on the korean hoverwing?