pub const TRANSONIC_ONSET_MACH: f64 = crate::drag::SUBSONIC_MACH_LIMIT; // 0.80000000000000004f64Expand description
Where a boattail’s drag starts its transonic rise and its base its relief: Mach 0.8, where
the rest of the buildup starts its transonic methods (crate::drag::SUBSONIC_MACH_LIMIT,
Niskanen 2009 p. 47). An earlier draft used 0.9, chosen after seeing the Arcas Robin wind
tunnel, a target (the decision record on the afterbody, ADR-030).