Kirby Morgan 77
3.4 Initial Adjustments to Your Helmet
Before using the helmet for the first time, it must be checked and adjusted for proper fit. There are several adjustments that must be made to provide a more comfortable fit when wearing the helmet.
3.4.1 Head Cushion
The fit of the helmet is primarily determined by the layers of open cell foam that fill the head cushion bag.
The center top/rear foam is very dense to reduce
WARNING
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compression and
The diver’s head can be moved forward into the oral nasal mask by adding layers of additional foam at the rear of the head cushion. Do not add to much foam to the rear of the head cushion, as this may position the diver’s chin too far into the oral/nasal mask and create an uncomfortable fit. The diver’s head can be moved up or down in the helmet by decreasing or increasing the foam pads at the top of the head cushion.
Usually, a diver with a small head will use all the foam that comes with a new hat. A diver with a larger head will need to remove a layer of foam in the center top and back of the head cushion. The foam may be cut with scissors to provide a better fit, or more foam can be added to give a tighter fit.
The chin cushion can also be adjusted if necessary.
3.4.2 Trimming the Neck Dam
If your helmet is new, or any time you replace the neck dam, it must be adjusted to fit you. New neck dams are cone shaped and will probably be too tight if not properly trimmed.
The neck dam must be trimmed to fit your neck. To trim the neck dam, have your tender hold the neck
The head cushion should be adjusted for best fit.
dam opening so that the two “edges” of the neck dam are parallel. The neck dam must be under slight tension but must not be stretched beyond its normal length. Trim the neck dam with the largest, sharpest scissors available, in order to make as few cuts as possible. There must be no jagged edges on the neck dam or it may tear.
Trim only 1/4 inch off the neck dam at a time. When you are done, the neck dam must be just tight enough
O-ring
Neck dam
Stepped |
|
Ring | Split |
| Ring |
Pull |
|
Strap | Screw |
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Neck Dam components.
WARNING
Never dive with a neck dam that is too tight. A neck dam that is too tight could cause the diver to pass out due to pres- sure on the carotid artery in the neck. This could lead to severe personal injury or death.
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