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From: G_AHRENDT@VAXA.CC.UWA.OZ.AU (Gunter Ahrendt)
Newsgroups: sci.military
Subject: Spitfires and F-13's.
Message-ID: <1990Aug7.040800.6653@cbnews.att.com>
Date: 7 Aug 90 04:08:00 GMT
Sender: military@cbnews.att.com (William B. Thacker)
Organization: AT&T Bell Laboratories
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From: G_AHRENDT@VAXA.CC.UWA.OZ.AU (Gunter Ahrendt)
The original prototype Spitfire had a massive 2 blade propeller.

By 1939 Constant-Speed 3 blade propellers were becoming available for the Mark 1

The Mark 6 was the first to use 4 blade propellers.

The Mark 14 was the first to use 5 blade propellers.

The Mark 21 Griffon 85 was the first to use 6 blade propellers.

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The USAF F-13 designation was used by Boeing for it's B-29 Superfortress 
Strategic Reconnaissance Version with large camera installations and 
long-range tanks. This version was known as F-13A. 117 were manufactured.