Ah, but:CFIDave wrote:The reason the DA40 XL failed spin testing with winglets was because of the high polar moment of inertia of the extended range (50 gal) fuel tanks located out near the wingtips. Because the DA 40 NG is much more fuel-efficient than a Lycoming DA40, it doesn't need the outboard wing tanks of the XL/XLS/XLT, with the NG's fuel capacity of only 39 instead of 50 gallons in the wings. That's why the NG can pass spin certification tests with winglets.
Here's a video showing Diamond's flight tests of the DA40 NG doing stall and spin testing:
https://www.youtube.com/watch?v=GQXLUaA3yo4
The DA40 TDI never got winglets AND with extended tanks (i.e. 39 gal) it has the same aft CG limit as the 50 gal. IO360's.
And the NG has the most restrictive rearward CG limit of all, regardless of fuel capacity. Why is that, anyway?