I think the real answer to this question is to know the bottom conditions of where you’re anchoring not so much as how you’re anchoring. I haven’t a clue as to how much of a “wind equivalent“ the M-25XP in my E32-3 pulls although I suspect it can be a lot but how to come up with a scientific answer is beyond my pay grade. I sail the Chesapeake bay and for the the most part the bottom consists of various consistencies of mud, mud with grass, mud with gravel, soft mud, harder mud, etc. I could go on but I’m hoping you get the idea, with different kinds of bottoms, plus different wind conditions/changing directions, comes different anchoring strategies. They are the type of anchor you’re using, the ratio of chain/rope your rode (most E boats use chain/rope) and how much scope. There have been times when I’ve dropped the hook, let out the appropriate rode and just let the boat settle in without using the engine to set the anchor. Other times when I knew the wind was going to be up I’d use the engine. Also, if I’m in a unfamiliar anchorage, with the wind up and forecasted to increase overnight with a change in direction I’ll set out with lots of scope and set and alarm on my iPhone to get up once or even twice during the night to check the anchor and my position. If the wind changes directions while you’re asleep and causes the anchor to reset then you’re probably not going to be using the engine. Although I do keep the key in the ignition and the engine ready to go if I start dragging in the middle of the night.
So as a scientific exercise it would be nice to know the wind equivalent pull of my engine in reverse on the anchor it’s better to know the bottom conditions and forecasted winds for the night.