Built mine as a conversion to 13mm power. Flies good on 1/2A3-2Ts and A10-3Ts. Only issue is the large 'booster stage' fins are a bit thin...shock cord cut a deep notch into one of them just recently. I may buy another and use smaller 'booster stage' fins with thicker stock. It'll get the proportions closer to the real thing, since I like flying it on 13mm engines.

FC