Kahlog, thanks for getting in touch with Sierra, I just received my BF-109 and it's great , but I was concerned about the retract installation also . I was considering going the way of Scalecraft and others until I read your post . I purchased a set of retracts for a CMP T-6 from Darrel and they are well made so I can imagine the ones he'll put together for the 109 will be just as good , I'll be giving him a call . A buddy of mine flies a P40 with Sierra's and they work good .

Someone in past posts was inquiring about putting a Gas engine in there plane, I'm hopeing to put an Evolution 26 in mine ( already got it from awhile ago, in an other plane right now ) the only concern about installing it is the front carb might be too close to the front ring of the fuse , if you can picture it . That big spinner would be tough to get a starter on and not slip off while trying to get a 4 stroke running , another reason for a gasser .