Can you be specific? Which accelerations are zero. This may be a bug. hud_ladr.cxx defines: // OBJECT MOVING RETICLE // TYPE ENERGY_MARKERS // ATTRIB - ALWAYS //energy markers - compute potential slope if(energy_marker) { if (total_vel < 5.0) { t1 = 0; t2 = 0; } else { t1 = up_vel/total_vel; t2 = asin((Vxx*Axx + Vyy*Ayy + Vzz*Azz)/(9.81*total_vel)); c172 JBS Axx, Ayy, Azz seem always zero where PA-28 and A-10 YASim have values. This effectively makes t2 = 0 and defeats the pot_slope from any value other than Vx, Vy, Vz. Mike
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