Mark, i just sent Savex my money. I had the L-39 silver version with the Wren 44. A great flying little combo but ended up selling before something happened. probably had 30 flights on it. What gear are you using, i have allways had good luck with gear, it's all about preperation and engineering. have you seen the video of the l-39 with lehner 1950 setup. It is literally faster than my turbine, i kid you not. thats when i decided to get one and do edf conversion. What does savex give you for ducting and how hard is it to install? Doug