If you are referring to the models shown on page one of this thread, then the 'rocket like ' model is an APS 'Windbag' (actually a 'Model Aircraft' plan-but Aeromodeller absorbed 'Model Aircraft' from Jan 1966-so the plans service contains plan originating in both magazines)-it is MA 386-and still apparently available:
Free Flight Unorthodox Various people have produced scaled up versions over the years but
AFAIK only the original sized one is available as a full sized plan. Presumably Traplet in the UK would be your best source for the plan
ChrisM
'ffkiwi'