In the process of evolving my plane I am working on, the sound of the gear retracting and extending has disappeared. I am using the following line in my sound file; [fltsim] alias=beech_king_air_350soundI am using this 'direction' technique because otherwise my model file will be massive during a download if they have to download all the sounds. (The King Air sound files are 9 megs big).Does anyone have any idea's? I would be grateful for any advice. Thanks Doug for the awesome information on the MOI inertia's.Bill

Bill,With regard to the MOI's you're most welcome, I'm happy to help. As far as the missing landing gear sounds are concerned, I found that removing these entries in the aircraft's CFG file [contact_points] section restored the gear sounds for retraction and extension:point.6 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.7 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.8 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.9 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.10 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.11 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.12 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.13 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.14 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.15 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.16 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.17 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.18 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.19 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.20 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.21 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.22 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.23 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.24 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.25 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.26 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.27 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.28 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.29 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.30 = -0.48, -4.64, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.31 = -0.48, 4.65, -4.99, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0point.32 = 12.76, -0.15, -5.00, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 4.0, 4.0, 0I have no idea why this works, except to say that FS2002 can be a little cranky and particular about what you add to the CFG file. The contact points section that restores the landing gear retraction and extension sounds appears below:[contact_points]point.0=1.000, 7.500, 0.000, -4.900, 1181.102, 0.000, -40, 40.000, 0.150, 2.500, 0.900, 7.000, 7.000, 0.000, 0.000, 0.000point.1=1.000, -1.417, -4.500, -5.100, 1574.803, 1.000, -40, 0.000, 0.260, 2.500, 0.841, 9.000, 9.000, 2.000, 0.000, 0.000point.2=1.000, -1.417, 4.500, -5.100, 1574.803, 2.000, -40, 0.000, 0.260, 2.500, 0.841, 9.000, 9.000, 3.000, 0.000, 0.000point.3=2, 3.119, -20.587, -0.155, 1800, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 5.0 //<-----addedpoint.4=2, 3.119, 20.694, -0.055, 1800, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 6.0 //<-----addedpoint.5=2, -25.181, -0.032, 1.100, 1800, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 7.0 //<-----addedstatic_pitch=-0.0214 //degrees (pitch when loaded on ground)static_cg_height=5.002 //feet, altitude of CG when at rest on the groundI took the liberty of adding scrape sounds to points 3, 4, and 5 (left wing, right wing, and tail as indicated by the arrows).You can use these if you want, and you may want to add other points/sounds to this section as your aircraft development progresses - but 32 points may be too much for FS to handle.Perhaps someone more knowledgeable about this matter than I am can answer this question for you.