Unfeathered propeller performance

My point is more that anything can happen, but for someone trainig for a multi engine license just focus on the events that are more common (engine failures, unscheduled feathers, prop overspeeds), instead of trying to logic solutions to the rare, almost unheard of situations.
Oh yes, I'll buy that. But what I won't actively discourage is someone asking about how the heavier metal works if that's their eventual goal.

Each rating has three spheres of knowledge:
- Need to know (if you don't know this, you'll bust)
- Nice to know (the examiner will probably expect you to know this, and if you don't know it, you just might bust)
- Trivia (if you want to impress your examiner, but you DO NOT need to know it, and especially not at the expense of the above two—oh and if you do try to impress the guy, you'd better be right)

(This is the part where someone points out that I'm not a CFI, but that doesn't mean I'm not right about the above.)

Granted the Bro conversation above is pretty far off into the weeds, but the principles of aerodynamics that OP is asking about with the drag from a prop not feathered are the same whether or not you're flying a Seminole or the Spruce Goose. And losing prop control isn't unheard of on a GA airplane (prop cable breaks, whee) but it's usually not as huge a deal either.
 
Can't speak for "real world" but "in the sim" in the 1900C - if the prop does not feather during a v1 cut the airplane will not fly very well. You may be able to get the gear up and feather the failed prop, but probably not - check autofeather works! It's important.
 
I have about 600 hours in the Lycoming powered DA42. With an engine failure at sea level on a cool day, you probably got around a 300-500 fpm descent if the prop wasn't feathered. With a feathered prop, it would climb around 200-300 fpm on a good day. With the prop feathered, flaps up, and the gear down, it would hold altitude in the winter, but not in the summer. Single engine service ceiling was approx 5-8,000 ft, depending on density altitude.
 
Meh. Figure any one of us on a regular day, takeoff number 4 out of 5 or whatever...engine failure. Surprise! How long for the PNF to figure out that the prop isn't feathered, or for the PF to communicate the same? I do agree that in the Sim it's weird that they weren't a bit more on top of it, though. I mean, you can be pretty sure that SOMETHING is going to break...
 
As I recall in a Seminole it was on the range of 100-200 fpm. But don't quote me.
& SteveJeff

Haven't flown the Seminole in about 3 years but I was able to dig this up...

Approximate drag factors per the Seminole POH are:

Flaps 25˚, -240 fpm
Flaps 40˚, -275 fpm
Windmilling prop, -200 fpm
Gear extended, -250 fpm

All said and done -725 fpm at flaps 40˚.
 
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