My buddy is currently making a fuse mold for a Folke-Wulf P.I. Now I have been flying electric and slope planes for years but I have never had any DF planes. The nacelle is 13" long and 3" around I was thinking about using the WeMotech 480 fan with an Astro 020. My question is how big does the inlet need to be and how big does the outlet need to be to make this fan efficient? I only have 3" around so maybe a different fan would be better? Second question were should the motor be placed should it be towards the front or rear or in the middle? The fuse length is 40" and the WS is 45" the WA is 315" squared. I am thinking of a RTF weight of 40 ounces which gives me a 18.3 ounce wing loading. According to the Astro flight website the 020 with the 480 fan on a 4 cell lipo puts out 492 watts at 35 amps at 36,000 rpm's.

Here is the link to the build thread.

https://www.rcgroups.com/forums/showthread.php?t=665191
Here are some pictures of the plane.