P37 Because flight trim angles were higher, a slight reduction in Ca would be expected. However, the figure shows that flight axial force coefficients were significantly higher . This was particularly true early in the entry when the Mach number was greater than 10. Very early in the entry near the 0.05-g point, accelerations are very small and the accuracy of the force coefficient calculation is poor. No obvious explanation is available for the high Ca values later in the entry between Mach 2 and 5.
Expected drag: 0.68
Observed drag 0.74
P 69 One phenomenon, common to both landers, was that the constant velocity descent phase was approximately 1 sec longer than anticipated, which converts into about
2.4 lbs of terminal descent fuel. Because we had about 30 lbs of fuel left over in both missions, this was of no consequence.