Couple basic questions

[gern_blanston]

In jets, you climb at V2, which is basically the same thing as Vyse in light twins, except once again, it varies a lot with altitude, temp, pressure, weight, etc.

V2 is more analogous to Vxse in Part23Land, but it'd be Vxse in the takeoff configuration, sort of a temporary best-angle-of-climb speed (with Vmca and stall margin consideration.) The Part 25 takeoff profile is more concerned with obstacle clearance in close than in rate of climb in close.
Final segment speed would be 'Vyse'.

 

[PropsR4Boats]

What about the HSI? The slaved part?

If I remember correctly, Vsse is the minimum speed at which the airplane should be flown with one engine inoperative, intentionally. Defined…Speed for safe intentional single engine operations. The manufacturer put it there for safety that’s it. It has no relevance to determining airplane performance, etc. Its there for the same reason they tell you not to spin a twin.

What do flaps do? When do stall horns sound? AOA! I’ll let you think about this one, it goes back. Use that stuff you learned along time ago to build on.