Say 4.4 lbs. (2 kG) 88 fps (26.83 m/s) 1/2 M V^2 so 1 * 26.83 * 26.83 = 718 joules
9mm pistol bullet muzzle energy is 519 joules That felt good to get my math on this morning... From: George Skorup Sent: Thursday, September 29, 2016 10:57 AM To: [email protected] Subject: Re: [AFMUG] cargo van partition/bulkhead question F=ma? I have no doubt a big ass drill bit going 60MPH could penetrate someone's skull. On 9/29/2016 11:52 AM, Josh Reynolds wrote: Put the drill at 88fps and 35lbs. Cloth seat. On Sep 29, 2016 11:44 AM, "Bill Prince" <[email protected]> wrote: Can't put more into it than it has to begin with. If the truck is going 88 fps, and runs into an impenetrable barrier (brick wall would be close), and "instantly" stopped. The drill bit "might" continue at that 88 fps. It can't go faster than that. bp <part15sbs{at}gmail{dot}com> On 9/29/2016 9:39 AM, Josh Reynolds wrote: Add in the G force of near instantaneous deceleration... On Sep 29, 2016 11:30 AM, "Bill Prince" <[email protected]> wrote: That sounds like an urban myth. It would take near-ballistic speeds (~~ 600-1000 fps) to drive a drill bit like that. Driving a truck into a brick wall at 60 MPH, would only get you ~~ 88 fps. bp <part15sbs{at}gmail{dot}com> On 9/29/2016 8:35 AM, Adam Moffett wrote: I didn't see it personally, but I'm told a guy here crashed an F-150 and the drill with 18" bit on it flew forward from the back of the cab and the drill bit poked right through the front seat. Missed him by inches. I imagine the seat slowed it down enough that it wouldn't have killed him, but still... ------ Original Message ------ From: "Ken Hohhof" <[email protected]> To: [email protected] Sent: 9/28/2016 7:11:46 PM Subject: [AFMUG] cargo van partition/bulkhead question Is there any legal or insurance requirement to have one of these? I hate them, and while I understand they are to prevent decapitation by a flying object from the cargo area, I can’t recall ever having such a flying object. I like having a rear window on the van for visibility, and even with a backup camera and sideview mirrors, being able to see out the back is nice. Are there other advantages to them? I guess the AC and heater might work better if isolated from the cargo space. I’ve seen claims it makes the cabin quieter, but anytime I’ve driven a van with a partition, there has been an annoying rattle from the door to the back. I could maybe see if you could put some shelving units up against the back of the partition. That might even make a van with dual sliding side doors viable.
