Re: propellor design

Date:         07 Jan 97 07:20:20 
From:         David Lednicer <dave@amiwest.com>
Organization: Analytical Methods, Inc.
References:   1
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PMacdou367 wrote:
>
> Can anyone explain the design differences between the Hamilton Satndard
> propellors used on the C130 Hercules and the P-3 Orion which use faily
> similar engines (T56-A-14/-15)? ie the P-3 uses rounded prop tips and the
> C130 uses square prop tips, what are the reasons?

	This actually gets a little more interesting...  The Lockheed
Electra, which the P-3 is derived from, has different prop blades too.
The reason for all these different props? - Different mission
specifications.  The C-130 is a military tactical/theatre airlifter, with
a need for short field performance and a moderate cruising altitude.  The
P-3 cruises at altitude to its patrol station, but then goes down low.
The Electra takes off, climbs to altitude and is then in cruise all day.

	A little trivia - the Electra and Convair 580 blades are
identical.

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David Lednicer             | "Applied Computational Fluid Dynamics"
Analytical Methods, Inc.   |   email:   dave@amiwest.com
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