33. Scenario 2with observed cloud and large fragments

This scenario takes the other view of the alleged frontal shot, namely that a single bullet from the front created the snap, the explosion, the forward-moving cloud, the large fragments that also moved forward, and the rearward lurch of the body. As with scenario 1, there are serious problems with this view. In fact, it is impossible. The sections below document this conclusion.

The procedure for calculating
It is tempting to keep the focus on the balance of momentum by dropping back to calculational scenario L5L, the one just before the four time intervals are added. The results for this scenario (not shown here) indicate that momentum and energy can be conserved, however, for the bullet, body, cloud, and large fragments, at least for some basic solutions. This standpoint makes the frontal hit seem feasible. But when scenario SL6L is used, however, it is seen that the timings for snap and lurch nearly always fail, along with other variables some of the time. Thus this scenario doesn't work.

The calculations
Results are shown below for a modified scenario SL6L, which incorporates the full suite of times and three-dimensional motions (plus the Θv and Θh from scenario 1 of the last section) but does not involve the tricky Rhead and Rbullet of SL6A. Scenario 6 was chosen over scenario 7 in order to set the potential energy, a more fundamental variable than the vcloud of scenario 7. Default settings for the other variables were used, which includes mhead = 57 lb, Θv = 9°, Θh = 118°, mcloud = 0.3 lb, dsnap = 2.4 in, and PE = 300 ft-lb. The first calculations are for a Mannlicher-Carcano, with mbullet = 161 gr and vbullet = 2067 ft s-1.

The results for snap and lurch
The results are shown below separately for mhead = 5, 6, and 7 lb. Allowed values are shown in bold green, disallowed values in red. The constraints are as before: 0 < tsnap < 54.6 ms, 0 < tlurch < 25 ms, vsnap ≥ 3.3 ft s-1, 0 < vfrags, vcloud < 1100 ft s-1.

 vbulletafter, ft s-1 tsnap, ms tlurch, ms vsnap, ft s-1 vfrags, ft s-1 vlurch, ft s-1 vcloud, ft s-1 Overall result -0 45.4 6.9 -4.41 868 -2.62 383 Disallowed -50 47.9 4.4 -4.18 1361   Disallowed -100 50.6 1.6 -3.95 3718   Disallowed -150 53.8 -1.5 -3.72 3928   Disallowed -200 57.3 -5.1 -3.49 1181 -1.98 213 Disallowed -250 61.4 -9.1 -3.26 657 -2.60 438 Disallowed -300 66.0 -13.8 -3.03 435 -2.60 476 Disallowed

The results for mhead = 5 lb give all negative snaps, which of course cannot be. This is the killer result. Beyond that, half of the values for tsnap, tlurch, and vfrags are disallowed. Overall, none of the solutions are allowed.

 vbulletafter, ft s-1 tsnap, ms tlurch, ms vsnap, ft s-1 vfrags, ft s-1 vlurch, ft s-1 vcloud, ft s-1 Overall result -0 54.4 -2.2 -3.67 2780   Disallowed -50 57.4 -5.2 -3.48 1162 -2.14 234 Disallowed -100 60.8 -8.5 -3.29 705 -2.67 431 Disallowed -150 64.5 -12.3 -3.10 488 -2.70 474 Disallowed -200 68.8 -16.5 -2.91 363 -2.67 490 Disallowed -250 73.6 -21.4 -2.72 280 -2.62 496 Disallowed -300 79.2 -27.0 -2.52 222 -2.57 498 Disallowed

The results for mhead = 6 lb are killed twice, by negative tlurch and vsnap. The values for tlurch are negative because the values for tsnap are too large. They are so large because the snap is so slow, and that is because of the near-perpendicular angle from the fence to the plane of the limousine. Again, none of the solutions are allowed.

 vbulletafter, ft s-1 tsnap, ms tlurch, ms vsnap, ft s-1 vfrags, ft s-1 vlurch, ft s-1 vcloud, ft s-1 Overall result -0 63.5 -11.2 -3.15 534 -2.79 468 Disallowed -50 67.0 -14.7 -2.99 407 -2.77 487 Disallowed -100 70.9 -18.6 -2.82 322 -2.73 496 Disallowed -150 75.3 -23.2 -2.66 260 -2.69 501 Disallowed -200 80.3 -28.0 -2.49 214 -2.64 503 Disallowed -250 85.9 -33.7 -2.33 178 -2.60 503 Disallowed -300 92.4 -40.2 -2.16 149 -2.55 503 Disallowed

The results for mhead = 7 lb are the clearest of all: tsnap, tlurch, and vsnap are all disallowed in all cases. That disallows all of the solutions.

Summary for Mannlicher-Carcano bullets
None of the 21 solutions were allowed. Two main factors caused this: rearward snaps (disallowed) and too-slow snaps. Thus we conclude that a Mannlicher-Carcano rifle fired from the knoll could not have caused JFK's motions.

Same test for XP-100 Fireball
Robert Vernon has been pushing the idea that James Files has confessed to firing the fatal head shot from near the corner of the stockade fence on the grassy knoll. He claims to have used an XP-100 Fireball modified to take Remington .222 rounds instead of the standard .221 rounds. The modified round would keep the weight of 50 grains but have a muzzle velocity of 3140 ft s-1 instead of the conventional 2650 ft s-1 for the .221 round. Files/Vernon further claim that this bullet did the damage seen to JFK's head, which means that it exploded it. The previous section showed that the XP-100 could not come close to explaining the rearward lurch by a simple transfer of momentum. Here we check whether it could create the lurch via an explosion. The tables below were generated in the same was as for the Mannlicher-Carcano above, except that a mass of 50 grains and an impact velocity of 3140 ft s-1 was used (full muzzle velocity to be generous).

 vbulletafter, ft s-1 tsnap, ms tlurch, ms vsnap, ft s-1 vfrags, ft s-1 vlurch, ft s-1 vcloud, ft s-1 Overall result -0 96.2 -43.7 -2.08 137 -2.04 409 Disallowed -50 99.6 -47.2 -2.01 127 -2.03 410 Disallowed -100 103.2 -50.9 -1.94 118 -2.02 410 Disallowed -150 107.2 -54.8 -1.87 109 -2.00 410 Disallowed -200 111.5 -59.1 -1.79 102 -1.99 410 Disallowed -250 116.1 -63.7 -1.72 94 -1.97 409 Disallowed -300 121.1 -68.7 -1.65 87 -1.96 409 Disallowed

The results for all three values of mhead give the same pattern: all values of tsnap, tlurch, and vsnap are disallowed (for the same reasons as above) and all values of vfrags, vlurch, and vcloud are allowed. They collectively disallow all the solutions. The difference between these results and those for the Mannlicher-Carcano is that these (for the XP-100 Fireball) are farther into the disallowed region.