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Helmet fitting systems 
 
editted by: Ron Kraan, Steen Hartov

Type

Reference helmet

Fielding status

Attributes

Foam pads

APH-5
APH-6

HGU-2/P
HGU-2A/P
early HGU-26/P

No longer used

Various pad thicknesses accommodated variable head sizes. Comfort dependent on user.

Three-strap sling

HGU-2A/P(G)
HGU-2A/P-D
SPH-3
SPH-3B
SPH-4

Some SPH-4 still in use

Individual strap adjustment provided user adjustability. Comfort difficult to achieve, some individuals experience significant discomfort, others had no problems. Attachment clips contributed to SPH-4 impact attenuation.

Thermoplastic Liner (TPLTM)

SPH-4
SPH-4B
Later HGU-55/P
HGU-56/P
Others . . .

Currently fielded

Widely accepted in the aviation environment. Can be individually fitted by heating. Can be cleaned. May adversely affect helmet stability. Durable.

Pads, mesh, & drawstring

IHADSS

Currently fielded

Difficult to comfortably fit the IHADSS helmet. May degrade helmet retention if too many pads are used to obtain comfortable fit.

Thermofit Liner (TFLTM)

Various SPH and HGU types

Special cases

Currently used by USAARL when comfortable fits cannot be attained with the standard issue TPLTM. Performance still under evaluation.

Foam in place

HGU-33/P
SPH-3C  
later HGU-26/P
early HGU-55/P

Not used by the Army

Provides an individual fit with little adjustment tolerance. Provides a stable fit, can become uncomfort-able if helmet is not repositioned to original fitting location. Difficult to obtain consistent foam density. Could affect impact attenuation performance.

Silicon foam fill

developmental

Proposed

Provides an individual fit. Pliable to relieve pressure points after redonning the helmet. Durability, operational performance, and user acceptability are unknown.

Epoxy coated foam

developmental

Proposed for Comanche helmet

Provides a stable, individual fit. Can become uncomfort-able if not repositioned to original fitting location. Durability, operation performance, and user acceptability are unknown.

Custom foam fit

U.S. Navy fixed-wing night attack helmet.
In it's original form used in HGU-33/P

Operation

Provides a stable, individual fit. Requires a wax mold of the aviator’s head be taken. Liner custom made to casting made from wax mold, at manufacturer’s plant. Lengthy time process. Method originally developed by Sierra corp. using plaster strips for making molds of aviators head.

 

"Venz" /  "Hud"  flightgear on-line 2002/2003