I noticed that alot of small park flyer models req'd like a 400T or a 400BL what does the "T" or "BL" stand for? Also a plane I have specs out a gearbox do I have to use a gear box or can I use a outrunner motor without the gearbox. The model I am refering to is the Nitro Models EP pitts calls for a 400T motor with a 5:1 gearbox and I want to install a E-flite 480 motor without a gearbox. is this wise or do I have to use a gearbox? Thanks in advance