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Old 15th Jan 2006, 17:03
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Macgyver
 
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Vmo vs MMo

Hey Mates,

Can someone please explain the difference between Vmo and Mmo? I'm thinking that Vmo is a limitation speed based on excessive dynamic pressure from flying at high speeds, while Mmo is a limitation based on shockwave damage from flying at high speeds. Is this correct?

Also, I do not understand why Vmo changes with altitude. I know for piston a/c, Vne does not change with altitude, so it seems logical to me that Vmo would be a constant CAS, while only the TAS would change with altitude.

Thanks.
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