Cool or useless?

[OreoGaborio]

The sum of the force transmitted past the cheekpads/head and onto the spinal column is only equal to the force it takes to accelerate the helmet to the speed at which it's moving off of the head...

So if the helmet maintains a steady speed, the forces are equal and opposite and no force is transmitted onto the spinal column.



If you wanted to simulate this, you could take three blocks or something... one representing the helmet, another representing the head and a third representing the body, put them all down on a surface like a sheet of ice & pretend it's zero friction.

Then, put something between the head & body that measured the force between them (which would tell you how much force is being put on the spinal column), and an expanding bladder between the helmet & head and slowly inflated it. That force measuring device would hardly register a thing.

Now put something on the helmet and head that creates drag between the two (like the cheekpads) and all of the force from the bladder would be spent on separating the two.

The only thing that would move in those two instances would be the helmet. The body would hardly move at all because virtually zero force is transfering past the head.



Anyway, I could be totally wrong, but that's just how I see it.... I used to be a total physics geek way back in highschool when we did this kinda stuff

[askmrjesus]

Originally Posted by OreoGaborio

The sum of the force transmitted past the cheekpads/head and onto the spinal column is only equal to the force it takes to accelerate the helmet to the speed at which it's moving off of the head...

So if the helmet maintains a steady speed, the forces are equal and opposite and no force is transmitted onto the spinal column.



If you wanted to simulate this, you could take three blocks or something... one representing the helmet, another representing the head and a third representing the body, put them all down on a surface like a sheet of ice & pretend it's zero friction.

Then, put something between the head & body that measured the force between them (which would tell you how much force is being put on the spinal column), and an expanding bladder between the helmet & head and slowly inflated it. That force measuring device would hardly register a thing.

Now put something on the helmet and head that creates drag between the two (like the cheekpads) and all of the force from the bladder would be spent on separating the two.

The only thing that would move in those two instances would be the helmet. The body would hardly move at all because virtually zero force is transfering past the head.



Anyway, I could be totally wrong, but that's just how I see it.... I used to be a total physics geek way back in highschool when we did this kinda stuff

You don't say...

Your physics are correct if the helmet is free to do what it wants, but it's my understanding that the helmet should be kept from rolling around when it's being removed. The added resistance of somebody holding it, is what I'm wondering about.

I suspect it's a matter of technique.

I'm not saying the thing is good or bad. I've just seen a lot of gizmos come and go over the years, that were designed by good intentioned riders, rather that doctors who actually (allegedly) know what the hell they're doing.

For the record, my plan would be to tell the EMT's to leave my helmet on, till I got to the hospital.

Unless of course I wasn't breathing, (in which case I wouldn't be talking anyway).

JC

[OreoGaborio]

Originally Posted by askmrjesus

You don't say...

Yeah... NERD ALERT!

[tommymac]

Originally Posted by askmrjesus

Unless of course I wasn't breathing, (in which case I wouldn't be talking anyway).

JC

thats about the only time I would consider removing the helmet of an injured rider I came upon in the field.

[askmrjesus]

OK, so I went and took the online course for EMT's.

Yeah, I lied, so what?

Anyway, after taking the course, and watching the thing in action, I've decided this thing gets the AMJ Seal of Approval.

There were some good endorsements from a doctor who seemed to know what he was talking about.

I'm going to buy the "Non-installed" version, cause I'm all about sharing.

I don't plan to use it on my own, since I don't ride around with a back board and a C collar, but I will have it handy for EMT's to use, if they need to establish an airway.

Otherwise, I'm still opting for "leave my shit alone till we get there".

Oh, for you non-believers....

JC

[OneSickPsycho]

I guess it beats asking someone trackside for a Dremel...

[OreoGaborio]

JC, can you whip me up a Harvard MBA?

[askmrjesus]

Originally Posted by OreoGaborio

JC, can you whip me up a Harvard MBA?

Sure, but MIT is out of the question.

JC

[karl_1052]

Originally Posted by askmrjesus

OK, so I went and took the online course for EMT's.

Yeah, I lied, so what?

Anyway, after taking the course, and watching the thing in action, I've decided this thing gets the AMJ Seal of Approval.

There were some good endorsements from a doctor who seemed to know what he was talking about.

I'm going to buy the "Non-installed" version, cause I'm all about sharing.

I don't plan to use it on my own, since I don't ride around with a back board and a C collar, but I will have it handy for EMT's to use, if they need to establish an airway.

Otherwise, I'm still opting for "leave my shit alone till we get there".

Oh, for you non-believers....

JC

Did the computer automatically blank out Jesus H Christ? Wow, it must have the fear of God in it.

[CrazyKell]

I'm not convinced. don't you have to kind of tilt the helmet to get it past the occipital area? If it just moves it straight off, I don't think it would really work.