Chaney's motorcycle in Zapruder frame Z-242

[Chris Bristow]

Walt, I get your intention now, I will do the LOS.
 Yes Chaney's hand is seen next to Kellerman but he could be next to the limo or farther away along Altgens line of sight. Every single observation made by all of us has not resolved that basic issue of where along the LOS Chaney sits.
I do think because the camera is only one foot above the limo we should see way more of Chaney in the hood. I would think we would see him extend half way to the hood ornament.

[James Hackerott]

I attempted to simulate the Altgens 6 scene, along with a view from Zapruder's POV and as an overhead. Chaney's position was animated from essentially half way embedded into the limo out to 10 feet of perpendicular distance (x) from the limo. For each 1 foot of x there are about 3.9 feet of eastward movement to maintain Altgens LOS. My biggest concern is that after placing the scene in Altgens I need to use Zapruder frame 249 rather that 255. I'm not sure yet how I will resolve this question. For better news, the MC jocky's helmets are rendered bright orange, for visibility, and to  recognize my Houston Astros!!!

201810142053 Chaney Altgens Zapruder Overhead..gif

[Walt Cakebread]

Walt, I get your intention now, I will do the LOS.
 Yes Chaney's hand is seen next to Kellerman but he could be next to the limo or farther away along Altgens line of sight. Every single observation made by all of us has not resolved that basic issue of where along the LOS Chaney sits.
I do think because the camera is only one foot above the limo we should see way more of Chaney in the hood. I would think we would see him extend half way to the hood ornament.

Chaney's hand and fingers could possible correctly proportioned to Roy Kellerman's right arm if Chaney was twenty five or thirty feet away from Kellerman....  Chaney's hand would appear much smaller ( compared to Kellerman's arm) if he was 25 or 30 feet to the rear of Kellerman.

[Chris Bristow]

I attempted to simulate the Altgens 6 scene, along with a view from Zapruder's POV and as an overhead. Chaney's position was animated from essentially half way embedded into the limo out to 10 feet of perpendicular distance (x) from the limo. For each 1 foot of x there are about 3.9 feet of eastward movement to maintain Altgens LOS. My biggest concern is that after placing the scene in Altgens I need to use Zapruder frame 249 rather that 255. I'm not sure yet how I will resolve this question. For better news, the MC jocky's helmets are rendered bright orange, for visibility, and to  recognize my Houston Astros!!!

201810142053 Chaney Altgens Zapruder Overhead..gif

That's a really nice simulation, it takes everything into account. Did you get the initial position of the limo using the lane marker by the front wheel? I ask because it's position is incorrect in the West map by a factor of 6 Z frames. If you align the limo to the lane marker in the West map it pushes the limo back to frame 249.
 According to your map and calculations the bike would have to move backward 8.75 feet from it's starting point. Imbedded 17inches + a 10 inch clearance for safety = 2.25 feet x 3.9 = 8.75 feet backward movement along Altgens los. I think the issue of handle bar clearance is the strongest evidence yet that Chaney is no closer than 3/4 of the way back to the rear. bumper.

[Chris Bristow]

Brian there is a red light that appears in 242 on the left side of the sprocket hole. That is likely Chaneys left from red light

[Chris Bristow]

Chaney's hand and fingers could possible correctly proportioned to Roy Kellerman's right arm if Chaney was twenty five or thirty feet away from Kellerman....  Chaney's hand would appear much smaller ( compared to Kellerman's arm) if he was 25 or 30 feet to the rear of Kellerman.

That is a tough judgement call comparing Kellerman's arm. Check out JFK's Left hand. He must have been making a really tight fist because his knuckes are so white you can see each one clearly. Compare Chaney's hand to JFK and Chaney's hand looks smaller.

[Chris Bristow]

I think so but people who disagree don't accept the Z film as real. It may well be faked in part, this part, who knows.