55mm means that the plane isnt stock and has been upgraded and oversized. They do not sell a 55mm edf version of an f-16. JPower produces and sells a 50mm version of an f-16. Your friend probably upgraded his edf unit for more thrust. The problem is even with a greater than 1 to 1 thrust ratio(aka ballistic or hovering), your problem is the fact that scaled down, your plane is hypersonic. The best I have seen personally is low triple digits (maybe). With an f-16, in that scale, you will not hit 125. If you do,the plane will probably break up.
Now then, You have been here 3 posts, so here is some lingo. Asking a completely off topic question in a completely off topic thread is called hijacking. We don't like this. There is a micro edf forum. it is here http://www.rcgroups.com/micro-edf-je...r-systems-650/
.Ask this question there.