Local Level Lab

Airborne measurements. Open methods.

Updated airborne findings

41 globe preferences, zero flat, 12 unresolved among the same 53 preselected stretches. The original study supplied 12 complete comparisons; numerical recovery adds 29, including the three previously recovered in the qualification trial. All forty-one favor the specified background-field globe over the zero-field globe in both processing cases. This does not identify the field's physical cause or measure a solar-versus-sidereal difference.

These are numerical model preferences. Statistical significance and uncertainty remain uncalibrated. The original observations, selected intervals and first-pass results are preserved.

The twenty-nine recovered stretches

Source recording Recorded IMU type UTC interval Duration Minimum / median ground speed
ILVIS0_applanix_55124_Ames_610-20Oct09_20Oct09.013 21 2009-10-20T13:23:57.047162Z to 2009-10-20T13:34:45Z 10.80 min 837.6 / 848.7 km/h
ILVIS0_applanix_55124_Ames_510-20oct09_20Oct09.013 8 2009-10-20T13:25:32.783556Z to 2009-10-20T13:35:17.822442Z 9.75 min 841.4 / 849.1 km/h
ILVIS0_applanix_55128_Ames_510-24Oct09_24Oct09.013 8 2009-10-24T13:25:51.649791Z to 2009-10-24T13:36:59.693758Z 11.13 min 851.9 / 858.0 km/h
ILVIS0_applanix_55128_Ames_610-24Oct09_24Oct09.013 21 2009-10-24T13:25:59.003646Z to 2009-10-24T13:37:05.003101Z 11.10 min 852.0 / 858.1 km/h
ILVIS0_applanix_55129_610-25Oct09_25Oct09.013 21 2009-10-25T14:57:57.272991Z to 2009-10-25T15:08:45.272659Z 10.80 min 839.8 / 843.1 km/h
ILVIS0_applanix_55131_610-27Oct09_27Oct09.013 21 2009-10-27T13:28:57.062636Z to 2009-10-27T13:34:29.062525Z 5.53 min 787.1 / 790.3 km/h
ILVIS0_applanix_55284_20100329_610_AMES_29Mar100329_103936.013 21 2010-03-29T13:06:37.134207Z to 2010-03-29T13:13:30.134487Z 6.88 min 862.3 / 863.2 km/h
ILVIS0_applanix_55842_610_LVIS.013 21 2011-10-08T15:00:19Z to 2011-10-08T15:07:25Z 7.10 min 891.4 / 904.5 km/h
ILVIS0_applanix_55844_610_LVIS.013 21 2011-10-10T12:20:04.228661Z to 2011-10-10T12:26:21Z 6.28 min 788.1 / 796.4 km/h
ILVIS0_applanix_55846_610_LVIS.013 21 2011-10-12T12:05:40Z to 2011-10-12T12:13:02Z 7.37 min 809.3 / 822.5 km/h
ILVIS0_applanix_57289_610_LVIS_38614965.013 21 2015-09-24T12:47:53Z to 2015-09-24T12:55:12Z 7.32 min 788.8 / 793.6 km/h
ILVIS0_applanix_57294_610_loaner_29Sept15LVIS.013 21 2015-09-29T12:47:39Z to 2015-09-29T12:56:32Z 8.88 min 884.6 / 887.9 km/h
ILVIS0_applanix_57294_610_DMS_29Sept15DMS.013 21 2015-09-29T12:48:57.087609Z to 2015-09-29T12:57:28.988956Z 8.53 min 884.6 / 888.0 km/h
ILVIS0_applanix_57298_610_LVIS_38614965.013 21 2015-10-03T14:01:56.618753Z to 2015-10-03T14:06:39Z 4.71 min 905.5 / 915.8 km/h
ILVIS0_applanix_57298_610_loaner_03Oct15LVIS.013 21 2015-10-03T14:18:15Z to 2015-10-03T14:27:08Z 8.88 min 881.4 / 895.6 km/h
ILVIS0_applanix_57298_610_DMS_03Oct15DMS.013 21 2015-10-03T14:18:43.047077Z to 2015-10-03T14:27:51Z 9.13 min 881.4 / 894.0 km/h
ILVIS0_applanix_57302_610_DMS_07Oct15DMS.013 21 2015-10-07T13:27:51.097754Z to 2015-10-07T13:36:56Z 9.08 min 837.6 / 854.6 km/h
ILVIS0_applanix_57305_610_LVIS_38614965.013 21 2015-10-10T13:51:59Z to 2015-10-10T13:59:04Z 7.08 min 816.6 / 823.4 km/h
ILVIS0_applanix_57305_610_DMS_10Oct15DMS.013 21 2015-10-10T14:14:55Z to 2015-10-10T14:24:15Z 9.33 min 900.7 / 913.9 km/h
ILVIS0_applanix_57307_610_loaner_12Oct15LVIS.013 21 2015-10-12T13:15:12Z to 2015-10-12T13:23:47Z 8.58 min 820.4 / 828.4 km/h
ILVIS0_applanix_57307_610_DMS_12Oct15DMS.013 21 2015-10-12T13:26:58.778403Z to 2015-10-12T13:30:59Z 4.00 min 786.5 / 795.9 km/h
ILVIS0_applanix_57312_610_loaner_17Oct15LVIS.013 21 2015-10-17T13:17:05Z to 2015-10-17T13:25:56Z 8.85 min 775.6 / 779.1 km/h
ILVIS0_applanix_57312_610_DMS_17Oct15DMS.013 21 2015-10-17T13:17:44Z to 2015-10-17T13:26:46Z 9.03 min 775.5 / 779.1 km/h
ILVIS0_applanix_57315_610_LVIS_38614965.013 21 2015-10-20T12:54:29Z to 2015-10-20T13:01:44Z 7.25 min 752.0 / 761.1 km/h
ILVIS0_applanix_57315_610_loaner_20Oct15LVIS.013 21 2015-10-20T13:15:17Z to 2015-10-20T13:24:12Z 8.92 min 746.7 / 754.1 km/h
ILVIS0_applanix_57320_610_loaner_25Oct15LVIS.013 21 2015-10-25T13:09:19Z to 2015-10-25T13:18:17Z 8.97 min 811.8 / 823.6 km/h
ILVIS0_applanix_57322_610_LVIS_38614965.013 21 2015-10-27T14:02:23Z to 2015-10-27T14:06:53.480000Z 4.51 min 833.8 / 842.8 km/h
ILVIS0_applanix_57324_610_loaner_29Oct15LVIS.013 21 2015-10-29T13:11:09.888451Z to 2015-10-29T13:20:04Z 8.90 min 883.6 / 892.4 km/h
ILVIS0_applanix_57324_610_DMS_29Oct15DMS.013 21 2015-10-29T13:16:56Z to 2015-10-29T13:26:08Z 9.20 min 868.4 / 879.9 km/h

The twenty-nine stretches add 237.91 minutes of completed comparisons. Completed findings include 2 IMU8 and 39 IMU21 stretches. These codes identify instrument/data configurations, not unique unit serial numbers or different experiment protocols. Their conversion scales are checked separately; the selection and physical model comparisons are the same.

The two October 20 recordings overlap in time and must not be counted as two independent flights. The forty-one resolved stretches contain 41 distinct recording hashes across 23 dates, not forty-one established independent replications. All 53 stretches list current dispositions, courses and latitudes. The current inventory preserves exact sources, hashes, intervals, speeds and result origins.

What changed in the calculation

The physical models, gyro-offset bounds, receiver weights and integration clock are unchanged. The revised solver checks its final correction with a fresh full-model prediction in metres, rather than rejecting it solely from a local residual approximation. The gradient and objective-change limits remain; predicted movement must be at most 1 mm RMS per axis and 1 cm at any receiver epoch. These are numerical stopping tolerances, not sensor accuracy claims.

The trial passed 24/24 fits, including 15 primary recoveries, six controls and three predetermined perturbed-start repeats, using 393 native sweeps. Each newly completed stretch has all six model/case fits and a passing repeat. Repeat agreement demonstrates numerical repeatability under these starts; it does not prove a global minimum. Individual results and the finite plan retain the evidence.

Completed wider recovery and remaining failures

The wider recovery completed all 159 new starts and 22,355 native integration sweeps, with 117 passing fits: 84/115 primary recoveries, 27/38 repeats and all six controls. There were no execution errors. The combined tally improves from 15/0/38 after the subset to 30/0/23. Some primary and repeat checks failed, so the entire run did not qualify every comparison; only individually complete comparisons contribute to the findings. Incomplete calculations remain unknown, rather than evidence for either shape.

Qualified wider-arithmetic recovery

The paired precision trial passed all 16 fits, including both controls and both perturbed repeats, in 129 native sweeps. It adds the October 24, 2009 IMU8 and October 7, 2015 DMS stretches, bringing the tally to 32/0/21. Wider internal arithmetic removes rounding sensitivity in these cost-only stopping failures; measurements, physical models, calibration bounds, clock, receiver weights and stopping tolerances are unchanged. Neither repeats nor probes replace failed original fits. All earlier outcomes remain available.

The completed cost-only recovery passed 83/86 fits in 891 sweeps and about four hours: 69/72 primaries, both controls and all twelve repeats. Nine additional stretches pass their complete comparisons, giving 41/0/12. Three primary fits exhausted their forty-evaluation allowance, so those stretches remain unresolved; the nine excluded stationarity/position-failure stretches remain unchanged. The run did not qualify every target. Only individually complete comparisons are reported.

Next are bounded continuations of the three budget failures, followed by a separate investigation of the other nine. All stretch metadata retains last costs, stopping reasons and recorder-pair differences. No recorded interval or physical bound was changed to obtain these recoveries.