1. Gear extended
2. Flaps down
3. Higher density altitude
4. More bank into operative engine
5. Lower power on operative engine
6. Being in ground effect
7. Higher weight
8. Forward CG
9. Lateral CG toward operative engine
10. Inop prop feathered
Remember to never associate Vmc factors with performance. Vmc is only about rudder effectiveness and thus heading control. As you can see...if the airplane is in the above configuration, you will be able to maintain heading but will be falling to the ground like a rock! When learning the factors you will want to know how the airplane is configured for certification, rather than what makes Vmc the lowest.
Oh...just read your profile...you probably already know the basics. Hope the list helps.
Depends what it does to the CG, I would guess. If you have ice on the vertical/horizontal stabilizer...baaad. Nose...goood. Wings=more rearward CG...baaad. Although if you've lost an engine in icing you better keep your speed up anyway.
If you take out bank, VMC actually increases. Try doing a VMC demo without putting your 5 degrees of bank and it will prove this true. You'll VMC 15 knots faster. Also, remember that the 5 degrees of bank is just part of the FAA regulation, you can put more than that and lower VMC even more.
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