There were no plans with the original. Except for identifying the CG and some other important data, the manual was basically a two-page list of tasks (1. assemble airframe, 2. install radio; 3. install engine, 4. apply covering, 5. fly. ). If you do a search here on RCU for modeltech and "cap 21" you might find a couple of others who built this plane and who might still have the manual. I flew mine three or four times and sold it in the interest of life being too short. It had a tendency to snap and I just did not enjoy flying it. I had an os 61 fx on mine.