Hey get the DX-6i that way you can use in on any plane. I am using the DX-7. Probably overkill for the vapor, but then I fly my 1/4 scale clipped with cub with a gas engine. Have to look and see if I have any pictures of the beast, 37,000 miles on it. Still all original. Look like Bonnie and Clyde going down the back roads.