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The Bell 540 rotor system, used on the UH-1C is the source of the rotor system without a stab bar. If you look at the 214, you can the progression from that start.

 

The composite blades were installed on a variety of UH-1 models - they were actually manufactured by Kaman.

 

Bluebird Helicopters were out of Cougar, Washington; and later purchased a fleet of CH-54B helicopters that are now owned and operated by HTSI in Oregon.

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And here is the next question...can you convert a 212 to a 412 and then a 412 single?

I know it's not a 214, and the pictures look more like a 204 than a 205, so I think helirider and DGP are right, it's a UH-1B with the cobra blades. I looked up a couple N numbers and they're model type is still a UH-1B, but they're restricted, and they don't give any info on the powerplant or the modifications done.

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Most popular former military UH-1 series type certificated in restricted category in the United States:

 

1. UH-1B, 44 foot rotor system, short cabin, T53-L-11D engine.

 

2. UH-1E, UH-1L, HH-1K, 44 foot rotor system (540 cobra style), short cabin, T53-L-13B engine.

 

3. UH-1F, UH-1P, 48 foot rotor system, short cabin, GE T58 engine.

 

4. UH-1H, 48 foot rotor system, long cabin, T53-L-13B engine.

 

STC's:

 

1. Installation of T53-L-13B engine in UH-1B

 

2. Installation of tail boom plug in UH-1B to install 48 foot rotor system.

 

3. Installation of 212 42 degree gearbox on all models.

 

4. Installation of 212 transmission and rotor system on UH-1H.

 

5. Installation of 212 tail boom and tail rotor, UH-1H.

 

6. Installation of T53-L-13B engine in UH-1F and UH-1P.

 

7. Installation of T53-L-703 engine in UH-1H

 

8. Installation of vertical fin replacement spar, all models.

 

A super UH-1B has the STC’s for the engine, tail boom plug, fin spar, and 42 degree gear box.

 

HH-1K shown.

 

hh1k01.jpg

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