RE: Dynaflite 81" Spitfire
Just be careful not to add too much weight to the tail, the nose is relatively short and balancing may require more nose weight. Originally I had an O.S. 1.08 in mine and it flew OK but I felt I didn't have any extra power for dicey moments. With the 1.08 I had to add some lead to the nose to balance. With the O.S. 1.60 I did not need the lead.