Original U.S. Vietnam War Helicopter Pilot Gentex SPH-4 Helmet with Carry Bag & Named 101st Airborne Jacket
-Original Item: Only One Available. This is a very nice United States Helicopter Flight Helmet type SPH-4 made by Gentex, with a rare and desirable double visor. The helmet is dated 1969 and is overall good condition with the liner, headset, and storage bag. Along with this is a named 101st Airborne Jacket, making this a very nice Vietnam war era pilots set.
The helmet itself is in a very attractive OD green color, with red retro-reflective tape markings added. The helmet is complete, with all the straps, rigging, and electronics present. Both the clear and tinted visors function correctly, and have intact knobs for moving and securing them. The clear visor does stick a bit. The only real issue with the helmet is that the foam rubber components have degraded, which is very common. The earphone foam is almost completely gone, as is the padding on the crown pad.
The helmet is maker marked by Gentex with a label on the back of the helmet:
The helmet comes with its correct CARRYING BAG - HELMET, which is made of very nice OD Green Fleece material. It still retains the original P.Q.M.D. Philadelphia Quartermaster Depot label, which gives the specification numbers. It shows some wear, but overall is in very good shape for the age. There is a pocket inside for a spare visor.
With this helmet came a very nice well-worn Airborne jacket, in size MEDIUM-REGULAR, which still has traces of the U.S. ARMY embroidery over the left pocket. There is also the remnants of Pilot's Wings. Over the right pocket is the name PRATT, and on the right collar is a rank insignia that looks to be for a Colonel. There is also a very nice 101st Airborne Division patch on the right shoulder.
This is a hard to find Vietnam era original rare helicopter helmet in wonderful complete condition, along with its correct carrying case and a named Airborne jacket! Ready to research and display!
History of the SPH-4
The Sound Protective Helmet-4 (SPH-4) is a derivative of the US Navy SPH-3 and was used by the US Army since 1970. The SPH-4 is a single-visor lighter-weight version of the SPH-3 and it replaced the two Army aircrew helmet then in use: The Navy-developed Aircrew Protective Helmet no 5 (APH-5) and the Army-developed Anti-fragmentation Helmet No. 1 (AFH-1). Both of these helmets were deficient in noise attenuation and retention capability. The SPH-4, which was specifically designed for sound protection, provided superior sound attenuation but the 1970 version provided no more impact protection than the APH-5A. As the sciences of crash worthiness and head injury prevention developed, it became evident that head injuries could be reduced by modifying the SPH-4.
Two types of head injury that might be prevented continued to occur after the introduction of the SPH-4. One was concussions severe enough to prevent the crew member from saving himself from the crash site, and the other was skull fractures due to blows from the side (lateral). Furthermore, helmet retention proved to be a problem as well. A helmet can only protect a crew member if it stays in place and it turned out that one in five crew members involved in severe crashes lost their helmet.
The original SPH-4 had a shell made of fiberglass cloth layers bonded by epoxy. The inner polystyrene foam energy absorbing liner was 97 mm (0.38") thick with a density of 5.2 lb/ft3. The helmet was fitted with a sling suspension liner and had a nape strap with a single snap on each side fitting to studs on a retention harness. The chin strap had a design strength of 150 lbs. The headset was mounted in 6 mm thick moulded plastic ear cups with excellent sound attenuation characteristics. A size regular helmet weighed 1.54 kg (3.4 lbs).
In 1974 the SPH-4 was modified with a thicker energy absorbing liner to reduce the risk of concussions. The new liner was 1.27 cm (0.50") thick and with the same density as the original liner. In 1982 the risk of concussions was reduced even further by manufacturing the energy absorbing liner with a lower density 4.5 lb/ft3. All in all the impact protection was improved about 33% over the original SPH-4 from 1970.
Nothing was done to the original SPH-4 design to reduce the risk of skull fractures due to blows from the side. The main culprit was the rigid plastic ear cups that turned out to be too strong in comparison with the skull around the ears. In case of a strong blow from the side the ear cup survived but the skull fractured. This problem was not addressed until the SPH-4B helmet was fielded.
Helmet retention, however, was improved. The original 1970 helmet had a chinstrap with single snap fasteners on each side and was designed to withstand a load of 150 lbs. In 1978 a double-Y chinstrap with two snap fasteners was incorporated to reduce failures. This chinstrap had a failure limit of 250 lbs based on the adjustment buckle strength. In 1980 a third chinstrap was introduced. It was fastened to the ear cup assembly on one side with a small screw and T-nut, and the other side with two snap fasteners. This chinstrap had a failure limit of 300 lbs but some failed at 280 lbs.
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