Has anyone out there removed an engine
from a motorglider and then flown it?

Anyone?

I did it for one season after having a propeller mast breakdown. It
required a new removing the nose batteries, adding tail ballast, and a
weight & balance. If you are set up to do it 1-2 hours would do.
Otherwise you will spend a day. Moffitt also did it for the 1984 15M
nationals (also a DG-400).

Tom
DG-400