26-02-2015, 10:43 PM
After time to think about your math, it seems to me that you are basing your figures on an assumption that Elm Street is a continuous 3 degrees slope from TSBD to point x. In fact Elm Street is level at the intersection of Elm and Houston and begins to slope down beginning at some point after you leave the intersection.
I think its far better to use the actual elevation changes measured by West, or by Robardeau in his map, than to imagine a perfect 3 degree slope from the base of the building to the street at point x.
Using those figures, I get an elevation change of (491.0 - 423.4) = 67.6 feet from nest to head (using the 53" measurement of JFK's head off the ground mentioned elsewhere in this forum). Measuring by Robardeau's plat map with pixel counting software (his scale is 4.14" per pixel) from nest to z313 (which incidentally matches a straight line between Nix and Zapruder, from the Nix photo at the headshot) you get a horizontal figure of 269.8 feet. The shot angle is (inv tan (67.6 / 269.8) ) or 14.1 degrees. The shot distance is SQRT((67.6)^2 + (269.8)^2) = 278.1 feet.
I think its far better to use the actual elevation changes measured by West, or by Robardeau in his map, than to imagine a perfect 3 degree slope from the base of the building to the street at point x.
Using those figures, I get an elevation change of (491.0 - 423.4) = 67.6 feet from nest to head (using the 53" measurement of JFK's head off the ground mentioned elsewhere in this forum). Measuring by Robardeau's plat map with pixel counting software (his scale is 4.14" per pixel) from nest to z313 (which incidentally matches a straight line between Nix and Zapruder, from the Nix photo at the headshot) you get a horizontal figure of 269.8 feet. The shot angle is (inv tan (67.6 / 269.8) ) or 14.1 degrees. The shot distance is SQRT((67.6)^2 + (269.8)^2) = 278.1 feet.
"All that is necessary for tyranny to succeed is for good men to do nothing." (unknown)
James Tracy: "There is sometimes an undue amount of paranoia among some conspiracy researchers that can contribute to flawed observations and analysis."
Gary Cornwell (Dept. Chief Counsel HSCA): "A fact merely marks the point at which we have agreed to let investigation cease."
Alan Ford: "Just because you believe it, that doesn't make it so."
James Tracy: "There is sometimes an undue amount of paranoia among some conspiracy researchers that can contribute to flawed observations and analysis."
Gary Cornwell (Dept. Chief Counsel HSCA): "A fact merely marks the point at which we have agreed to let investigation cease."
Alan Ford: "Just because you believe it, that doesn't make it so."