Go to the Corona, or "Lite Machines" forum, about two category's above the Mikado Logo entry on Runryder. Back about two or three pages, on the postings, there is mention of and the thread that gives access to "The Electric Helicopter Beginner's guide", second version, by Toshi...Don't know if you're already familiar with this article, but it contains over 100 pages of useful electric heli info, including that about Logo. Interchangable main parts are mentioned. I have the first version of this article burned on a disc, the second version, I havn't seen. Good luck, Steve.