Lear Jet models 23/24/25. I’ve flown all three. Don’t remember too much about the V1 cuts. They all had autopilots, somewhat crude though. Could climb performance, 6000fpm with fuel and pax.. The 23 we had was limited to FL 41.0, the 24 had a FL 45.0 limit and the 25 had the FL 51.0 limit. It was a challenge to hand fly them at those altitudes. I spent about 2 ½ hours hand flying one at FL 45.0. You have to be real smooth to do it. We had the 25 up to FL 50.0 one day. At FL 45.0 and above you can really see the curvature of the earth.

The 25 had a flight director and the 23/24 had HSI’s