Bell
HTL
Sioux
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Photo: Robert Deering 4/18/2015
 National Museum of Naval Aviation
NAS Pensacola (NPA)
Pensacola, Florida

Originally designed as a commercial helicopter, the HTL Sioux was acquired by the U.S. Navy for training purposes in the late 1940s, and were in use until retirement in April 1964.  HTLs were used in the Apollo program to familiarize astronauts with its auto-rotation sink rate which was similar to the Lunar Excursion Module

Initially, the United States Navy procured several Bell 47s, designated HTL-1, between 1947 and 1958. The United States Coast Guard evaluated this model, and procured two HTL-1s for multi-mission support in the New York Harbor. The most common U.S. Navy version of the 47 was designated the HTL-4, and dispenses with the fabric covering on the tail boom. The U.S. Coast Guard procured three HTL-5s in 1952 (similar to the HTL-4 but powered by a Franklin O-335-5 engine) and used these until 1960.  The Coast Guard procured two of Bell's Model 47G and designated them HUL-1G in 1959.

SOURCE: National Museum of Naval Aviation & Wikipedia
Variants  
HTL-1
 10 Bell 47A helicopters procured by the U. S. Navy for evaluation as trainers. The HTL-1 was powered by a 175 hp (130 kW) Franklin O-335-1 piston engine.

HTL-2
US Navy equivalent of the commercial Model 47D. 12 built.

HTL-3
US Navy equivalent of the commercial Model 47E, powered by a 200 hp (149 kW) Franklin 6V4-200-C32 engine. Nine built.

HTL-4 / TH-13L
The most common U.S. Navy version.  Dispenses with the fabric covering on the tail boom.

HTL-5
Utilized a Lycoming O-335-5 engine.

HTL-6 / TH-13M
Incorporated a small movable elevator.

HUL-1G / HH-13Q
Used by the U.S. Coast Guard for search and rescue.

HUL-1M / UH-13R
Powered by an Allison YT63-A-3 turbposhaft engine.
 
 
 
 
 
 
 
For U.S. Army and Air Force Variants see H-13
 
 
H-13
Sioux