piasecki H-21

in usa US Army Aviation


Del'd: 334 - 1954 to 1966






H-21 US Army Aviation

History of this Model in this Organisation:

The US Army awarded Piasecki a contract for the H-21C Shawnee in 1952. Deliveries began in Aug 1954. A US Army H-21 named Amblin Annie made the first non-stop transcontinental helicopter flight across the United States, a distance of 2610 miles, in 37 hours on 24 Aug 1956 using in-flight refuelling.

US Army H-21s, which could carry 20 troopers each, were sent to Vietnam in Dec 1961. Despite its usefulness as an assault and cargo carrying helicopter, it was vulnerable to ground fire due to a slow speed and poor protection of its vital internal systems. These lessons were learned for the UH-1 Huey in 1963 and later, the CH-47 Chinook which were more robust and had replaced it in-theatre by 1964.

Of the 334 H-21s for the US Army, many of which were at H-21C standard (and known elsewhere as the Vertol Model 43), about 140 were passed on to foreign military services. Most had been withdrawn from US Army service by 1966.

The CH-21B/C Shawnee helicopter was not as vunerable as previously believed. The issue that has led to its being vunerable is due to its Wright Cyclone R-1820-103A radial engine which was never designed to operate at the high rpm and manifold pressures required when carrying maximun allowable loads. Engine failures were commonplace, most commonly brought about by failure of the master rod bearing. The CH-21 was faster than either the UH-1A/B helicopters. The UTT Company which was equipped with both UH-1 models when loaded were unable to keep up with the 21. Usually we (those flying the H-21) were asked to slow down so they could protect us. The standard load in Vietnam was 11 ARVN soldiers plus a crew of four. In the delta the standard fuel load to begin operations was 1300 pounds.



Help us with info about this model in this organisation

@ (optional)     Send


Units with this Model in this Organisation:

YearsUnitsbold : Current base of the Unit
1957/6657 TC



Roles of this Model in this Organisation:

Roles
heavy assault
military transport



Construction Numbers of this Model in this Organisation: Help Us    

C/NModBuiltID     In this OrganisationIn other Org

    C.3 H-21C     51-15883: 1960s pictured transporting a M101 105mm howitzer
    C.172 H-21C     55-4218: US Army H-21C; to MASDC /XH056; preserved at Lowry Heritage+
- 53-4379: 30jul92 pictured preserved at Lowry Heritage Museum
    C.188 H-21C     56-2026: US Army; Aug67 pictured at Dulles International Airport air +
    3 C/N found in this Organisation





Flying a Helicopter   |   Accidents   |   Jobs  

38915 serials     9120 photos     2735 heliports
Countries
Helicopters
Ships
Mobile: m.helis.com   |   Helis Airliners





MH-53M,     MH-60R     Gazelle HT.2 & HT.3
EH.101,   NH.90,  Tigre,   Bell 430,   AW.139
Orgs. CV-22 Osprey,     EC.145
Units:HS-1,   78Sqd,   USCG,   PNA
Ships:Destroyers,     HMS Ark Royal
New:Bell 525,   AW.149,   AW.609,   S-61T
X2,   X3,   EC.130T2,   EC.175
US Army AAAS     Ultralights
    Helicopter News:
MD530G demonstration at Yuma Proving Ground

Russian Aircraft Repair Plant 12 80th anniversary

K-MAX Conducts First Fully Autonomous Mission

HMM-364 in Partnership of the Americas 2014

Northrop Grumman to Modernize UH-60L Cockpit

Estonian pilots receive highest Maryland NG award

Pennsylvania Apaches in Operation Northern Strike

NY National Guard Northern Border Security Exercise

High-Tech AW169 Cabin Unveil at LABACE

Bell 429 EMS Australia New Zealand demo tour

PHI Reaches FAA SMS highest level

AgustaWestland at LABACE 2014

Helicopter History Site - www.helis.com - Online since 1997 - Privacy Statement - RSS - Facebook - Twitter - Linkedin - Google+

This page downloaded 21 Aug 2014 21:56:17 MDT