the skinny--
i am posting this straight from my facebook page today to save time...attention Porsche and Nascar-- :O)
Porsche
crash analysis : i noticed an issue with this Carrera after hearing
about this tragedy and digging into what was going on a bit--
here goes...
i am hazarding a guess, that this model has an "x-frame", with a rear engine( the tail wags the dog on this thing), this, combined with the possibility of a "pilot-error"( of using only your toe to push the gas in a corner, specifically), can result in extreme "over-steer"( a "super-drift", after the driver steers to correct), landing the car in the "in-field"( essentially, the engine decelerates the drive-train instantly, "engine-breaking" only the rear wheels, causing them to break traction, in the corner, and the rear of the vehicle to "come-around", creating severe "over-steer", at a really bad time)...i feel this may be why this super-car went off the black-top, into a pole, and then a tree( i would add, that if the pole was one treated with "creosote"...it was a veeerry strong pole), the serious issue of note, besides the horrible loss of life, is about physics...the dynamic is readily displayed, as the tree or pole encountered, becomes a "fulcrum point", acting like a pulley( in a kind-of "archimedes crash-dynamic"), the car is rear-heavy...meaning, at this vector, the rear of the car having the most weight, wants to keep going around the pole, on the rearward side of the hit...the car is made to absorb impact, and the center of the "x-chassis" is weak from the side, allowing the center of the car to "hinge-in-the-middle"...ri
to test this "archimedes crash-dynamic" yourself, at home, place your finger flat on the edge of your kitchen table, parallel to the edge, then smack your finger with a "wooden coffee stir-stick"( with the middle of the stick)...the stick will not break, but, then tape a bunch of quarters to the end of the stick, and again hit your finger in the same place, with the modified stick...it will break, with about the same force felt against your finger, this displays the leverage "in-play", if a Carrera of this type encounters an object within "the-in-field", while racing...i will get-into what to do about this phenomenon within the next photo's captions...
best wishes, john kruschke--
here goes...
i am hazarding a guess, that this model has an "x-frame", with a rear engine( the tail wags the dog on this thing), this, combined with the possibility of a "pilot-error"( of using only your toe to push the gas in a corner, specifically), can result in extreme "over-steer"( a "super-drift", after the driver steers to correct), landing the car in the "in-field"( essentially, the engine decelerates the drive-train instantly, "engine-breaking" only the rear wheels, causing them to break traction, in the corner, and the rear of the vehicle to "come-around", creating severe "over-steer", at a really bad time)...i feel this may be why this super-car went off the black-top, into a pole, and then a tree( i would add, that if the pole was one treated with "creosote"...it was a veeerry strong pole), the serious issue of note, besides the horrible loss of life, is about physics...the dynamic is readily displayed, as the tree or pole encountered, becomes a "fulcrum point", acting like a pulley( in a kind-of "archimedes crash-dynamic"), the car is rear-heavy...meaning, at this vector, the rear of the car having the most weight, wants to keep going around the pole, on the rearward side of the hit...the car is made to absorb impact, and the center of the "x-chassis" is weak from the side, allowing the center of the car to "hinge-in-the-middle"...ri
to test this "archimedes crash-dynamic" yourself, at home, place your finger flat on the edge of your kitchen table, parallel to the edge, then smack your finger with a "wooden coffee stir-stick"( with the middle of the stick)...the stick will not break, but, then tape a bunch of quarters to the end of the stick, and again hit your finger in the same place, with the modified stick...it will break, with about the same force felt against your finger, this displays the leverage "in-play", if a Carrera of this type encounters an object within "the-in-field", while racing...i will get-into what to do about this phenomenon within the next photo's captions...
best wishes, john kruschke--
next photo--
Porsche
crash analysis #2 conclusion :
to prevent the outer "longitudinals" of this vehicle from "wrapping-up" too much( around an object encountered from the side, that strikes towards the front of the car, where there is little weight, allowing the car's rearward weight to easily leverage the car into a "horse-shoe"), i believe that a cable could be installed, that runs through the frame, on each side, from the front of the frame to the rear, on the outer edges, with a rubber sheath, to keep it quiet, and having "guide channels" for it to pass through...i suggest that this would allow "collapsibility" during a frontal collision( as cables are flexible), but would not allow the chassis to deform into a "horse-shoe" shape, if a side collision occurs...most importantly, the mounting points for the front seats, and the seat-belt anchor-points, must not be compromised, to deal with this issue, i am guessing that a large steel plate is often welded to the floor, to bolster the anchor points, unfortunately, i believe that the forces are so great in this situation, that this may not be a viable solution...i feel that utilizing a 3/8-1/2 inch thick steel plate, is the answer, but, the plate should( in my opinion), be elevated a slight amount above the floor, at the mounting points, creating a situation similar to that used on bridges in icy waters( the "pylons" act like the hulls of ice-breaking ships, and shear the ice, at the base, where they contact the ice)...this solution would allow the rear points of the plate, that has the belt-anchors and the seat-mounts( located on the same plate), that is then bolted to the floor...to shear, or cut, through the floor, when it moves out of alignment, leaving the seat and the belt-anchors in perfect alignment, after the frame has bent...essentially, i feel that "full-welding" a plate to the floor offers too much influence on the seat-belt, and seat mounting points alignment, from chassis bending--
the fire--
as for the fuel line pulling out of the tube, from the gas-tank in front( where it enters the engine bay, in the rear), a longer hose, that allows more travel of the engine, away from the bulk-head, or fuel pipe, may be a possible solution( flexible fuel-lines in the middle of the car, may also be of use, to deal with fire hazard from side impacts as well)...lastly, turning off the ignition switch after a crash is imperative, as it cuts any fuel-spray from the pump onto hot engine parts, after the crash--
i feel that this analysis is a bit soon after this terrible crash, but the next Carrera of this model that crashes, may happen an hour from now...so, this issue is important, right now, and need not happen to another person, if corrected--
i hope these concepts are forwarded to the good men at Porsche, in Stuttgart, right away...best wishes, john kruschke...
we all lost something here, these guys were cool--
to prevent the outer "longitudinals" of this vehicle from "wrapping-up" too much( around an object encountered from the side, that strikes towards the front of the car, where there is little weight, allowing the car's rearward weight to easily leverage the car into a "horse-shoe"), i believe that a cable could be installed, that runs through the frame, on each side, from the front of the frame to the rear, on the outer edges, with a rubber sheath, to keep it quiet, and having "guide channels" for it to pass through...i suggest that this would allow "collapsibility" during a frontal collision( as cables are flexible), but would not allow the chassis to deform into a "horse-shoe" shape, if a side collision occurs...most importantly, the mounting points for the front seats, and the seat-belt anchor-points, must not be compromised, to deal with this issue, i am guessing that a large steel plate is often welded to the floor, to bolster the anchor points, unfortunately, i believe that the forces are so great in this situation, that this may not be a viable solution...i feel that utilizing a 3/8-1/2 inch thick steel plate, is the answer, but, the plate should( in my opinion), be elevated a slight amount above the floor, at the mounting points, creating a situation similar to that used on bridges in icy waters( the "pylons" act like the hulls of ice-breaking ships, and shear the ice, at the base, where they contact the ice)...this solution would allow the rear points of the plate, that has the belt-anchors and the seat-mounts( located on the same plate), that is then bolted to the floor...to shear, or cut, through the floor, when it moves out of alignment, leaving the seat and the belt-anchors in perfect alignment, after the frame has bent...essentially, i feel that "full-welding" a plate to the floor offers too much influence on the seat-belt, and seat mounting points alignment, from chassis bending--
the fire--
as for the fuel line pulling out of the tube, from the gas-tank in front( where it enters the engine bay, in the rear), a longer hose, that allows more travel of the engine, away from the bulk-head, or fuel pipe, may be a possible solution( flexible fuel-lines in the middle of the car, may also be of use, to deal with fire hazard from side impacts as well)...lastly, turning off the ignition switch after a crash is imperative, as it cuts any fuel-spray from the pump onto hot engine parts, after the crash--
i feel that this analysis is a bit soon after this terrible crash, but the next Carrera of this model that crashes, may happen an hour from now...so, this issue is important, right now, and need not happen to another person, if corrected--
i hope these concepts are forwarded to the good men at Porsche, in Stuttgart, right away...best wishes, john kruschke...
we all lost something here, these guys were cool--
the fix--
Archimedes
seat-mount--
for the inspection of the folks at Porsche, in Stuttgart( i feel that the factory should proceed from here with this design, if anyone does...naturally, do not try this at home applies)--
that said, i will describe the concept...here we see the seat elevated a small amount above the floor-pan( on "stilts", is my best description), due to the seat, and the seat-belts mounts, being on the same 1/4-1/2 inch steel plate, that is not "full-welded" to the floor, but is instead, mounted at four points to the floor, on pillars...in this way, the amount of bending the chassis can endure before the seat moves is enhanced, also, due to the seat-belt mounts not being attached directly to the chassis floor( as is the case in fighter-jet design), the seat, and seat-belt mounts, can not be influenced by chassis bending, unless the cabin is pressed in, all the way to the rear foot-wells, even then, the fact that the seat is on "stilts", will result in the seat twisting with the chassis, while the vehicle's seat-belt mounting points remain located in approximately the same factory locations, to provide the needed vector to the occupant's waist, maintaining good geometry( although they are not bolted directly to the floor), a simple "cantilever-stay", at the base of the plate, where the seat belt attaches, going from there, to the rear seat-mounts, keeps the plate from curling upwards, from frontal impact forces...the question for me, is about the ability of the factory to keep the seat from being ejected from the car, with the occupant in it...i believe they can, and if ejected, the injuries would likely be far less severe, for those involved in the collision( in my opinion)...testing will be needed if this concept is to be validated( i suggest that Porsche, or Nascar, are the best groups to pursue the development of this safety feature)...i really think this will solve the issue, after serious professionals "work-the-problem"--
best wishes, john kruschke...
for the inspection of the folks at Porsche, in Stuttgart( i feel that the factory should proceed from here with this design, if anyone does...naturally, do not try this at home applies)--
that said, i will describe the concept...here we see the seat elevated a small amount above the floor-pan( on "stilts", is my best description), due to the seat, and the seat-belts mounts, being on the same 1/4-1/2 inch steel plate, that is not "full-welded" to the floor, but is instead, mounted at four points to the floor, on pillars...in this way, the amount of bending the chassis can endure before the seat moves is enhanced, also, due to the seat-belt mounts not being attached directly to the chassis floor( as is the case in fighter-jet design), the seat, and seat-belt mounts, can not be influenced by chassis bending, unless the cabin is pressed in, all the way to the rear foot-wells, even then, the fact that the seat is on "stilts", will result in the seat twisting with the chassis, while the vehicle's seat-belt mounting points remain located in approximately the same factory locations, to provide the needed vector to the occupant's waist, maintaining good geometry( although they are not bolted directly to the floor), a simple "cantilever-stay", at the base of the plate, where the seat belt attaches, going from there, to the rear seat-mounts, keeps the plate from curling upwards, from frontal impact forces...the question for me, is about the ability of the factory to keep the seat from being ejected from the car, with the occupant in it...i believe they can, and if ejected, the injuries would likely be far less severe, for those involved in the collision( in my opinion)...testing will be needed if this concept is to be validated( i suggest that Porsche, or Nascar, are the best groups to pursue the development of this safety feature)...i really think this will solve the issue, after serious professionals "work-the-problem"--
best wishes, john kruschke...
--( the photo above shows the plate in 2-d, but if you visualize the plate not being welded to anything but the seat, and the seat's mounting pedestals, you can grasp the concept very well)--
more later, out of time at the library--
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