Blackhawk v Huey

[john smith]

A flight of three UH-60 Blackhawks performed a flyover this morning
during our local Independence Day parade.
It struck me that they were able to get within one-half mile
(thereabouts) before I noticed the "helicopter" sound.
I had noticed this previously, but had filed it away.
I then got to thinking about the old UH-1 Huey's and how they could be
heard miles before you could see them.
Can someone definitively tell me what improvements were made to the
UH-60's to make them quieter than the UH-1's?
What is it about the main rotor blades and/or tail rotor blades that has
been changed?

[Paul Tomblin]

In a previous article, john smith > said:
>I then got to thinking about the old UH-1 Huey's and how they could be
>heard miles before you could see them.
>Can someone definitively tell me what improvements were made to the
>UH-60's to make them quieter than the UH-1's?

The UH-60 has 4 blades, the Huey has 2. Maybe the Huey blades have to
spin faster?


--
Paul Tomblin > http://blog.xcski.com/
The superior pilot uses his superior judgement to avoid situations in which he
has to demonstrate his superior skill.

[Hawkeye[_2_]]

Improvements in blade design and technology have cut sound signature
of helicopters tremendously. The Huey used what can be best described
as a "plank" for a blade. The Blackhawk uses a very different shaped
blade especially at the tips.

Helicopters don't fly...they beat the air into submission.