Ergonomic Pet Peeve


Back in the day, as a gunner on the Bradley, it was Standard Operating Procedure that whenever, wherever we were conducting a mounted movement, the gunner would scan his sector,  just as he would be expected to in a wartime environment. Train as you fight, and it is always the threat you don’t see that kills you. So I spent a lot of time with my face plastered to the Integrated Sight Unit, and my hands on the Gunners Hand Station, scanning back and forth, usually to the right flank of the platoon, knowing full well that I wasn’t going to spot anything more nefarious on Fort Carson’s tank trails than an antelope, or possibly a coyote. Given my druthers, I’d just leave the turret pointed straight ahead, and stand up in the hatch side by side with the Bradley Commander (BC) and enjoy the fresh air and nice breeze.* But the SOP was to scan, and so scan I did.

Now, I didn’t really mind this. It was boring, but even then, the view was a lot better than what the dismounts in back had. And while the ride was bumpy and the turret was a pretty snug fit, it wasn’t too bad. But what really made me angry was that for all the money the Army had spent on the design and layout of the Bradley, one little flaw caused me no end of discomfort, and could have been easily avoided.

Here’s the Gunner’s Hand Station that controls the turret of the Bradley.

Bradley-Control-Units-61

You’ll note the careful lines of the actual hand grips. Looks like care has been taken to make them comfortable, no? Actually, they are not. You’ll notice they’re exactly parallel with one another.

Sit in a straight backed chair. Make fists with both your hands and hold them out in front of you, with your elbows by your sides, like a Rock-em Sock-em Robot. You’ll notice your fists are exactly parallel with one another. But they’re also about 18-20 inches apart. Now move those fists together until they’re only about 8 inches apart. You’ll notice that as you move them closer, your fists are no longer parallel, but rather at an angle of around 60 degrees. Now, with your fists still 8 inches apart, rotate your wrists until your fists are parallel with one another again. It is a very unnatural position, isn’t it?

Holding the GHS for more than a few minutes, or an hour at most, begins to cause significant pain in the wrists, and because of the way the hand fits to the handle, to the palms of the hands. And while it is easy to operate the GHS with one hand, that only provides temporary relief. Sooner or later, both hands hurt.

Here is what really, really irritates me about this. At the same time the Bradley was being developed, the M1 Abrams was being developed. And the Gunners Hand Station on an Abrams has it’s handgrips angled in, about 30 degrees for each grip. As an added bonus, the tops are tilted in a bit for an even more natural, ergonomic fit to most hands.

The mechanical complexity of both control systems is almost identical. In fact, I never understood why Bradley’s didn’t simply use the very same control. While the Bradley, in my mind, is primarily an Infantry branch vehicle, the folks in the Armor community were there for the development of the system. Armor branch had had folks struggling with gunnery controls for over 40 years by the time the Bradley came along. They knew what they were doing.

Even worse, the picture of the controls above? When the Army upgraded it’s Bradleys after Desert Storm and added Laser Range Finders, they had to upgrade the controls. And that’s what is in the picture above. So they had a second bite at the apple, and still didn’t fix the poor, pain inducing ergonomics of the GHS on the Bradley. It wouldn’t have cost a dime to ease some poor grunts lot in life, had only they taken a moment to add a tiny change to the plans.

And that still irks me.

 

 

*Except in the winter. I kinda liked being inside when the temps dropped below zero.

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10 Comments

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10 responses to “Ergonomic Pet Peeve

  1. M1A1TrkTrror

    I have never seen those grips in my time in. Not sure when they changed, because I’ve never seen your style of Gunner’s Primary Control Handles, but this is what they look like my girl, I-23, and every Bradley I’ve been in:

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    • M1A1TrkTrror

      Additionally, there is no “slew” button on the Abrams gunner’s handles. Traverse speed is controlled entirely by severity of the angle the handles are rotated. The thumb button controls the Laser Range Finder, which on the Bradley ODS and M2/M3A3 is controlled by the grey switches inboard of the slew button on the pic I linked to.

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  2. My older was in Human Factors Engineering at GD back in the day, mostly working on prototypes and that’s exactly the kind of thing they paid attention to. So, when doing their prototypes, they would, go figure this, have _actual_ tankers fiddle with the prototype equipment. I guess either the Bradley designers never did that or never did it for more than a couple of minutes.

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  3. Esli

    My first inclination is to say “waah.”. Second thing I did was drop down into the gunner’s station on my sweet M1A2 SEP v 2 and the handles are parallel and not canted back. So, waah…

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    • Esli

      I’m in the field right now… I don’t always hang out on my tank.

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    • Well, be nice to your gunner, and swing the turret for him once in a while.

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    • Esli

      I am nice. They take care of me, and me, them. My Commander’s Power Control Handle is very ergonomic. Has too many switches and buttons though: palm switch, trigger, laze, designate, stadia reticle, and the mouse for the FBCB2.

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    • When HOTASS (Hands On Throttle and Stick Systems) were introduced in the F-15 and F-16, mastering the buttons came to be known as “playing the piccolo.”

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    • I always figured the CPCH was on the right so you could smack the loader with your left hand. And the gunner is directly in front and below you so you could kick him in the head.

      The driver is safely tucked away so you can’t hurt him while he’s driving.

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