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Re: [OM] Aerial Photography [OT]

Subject: Re: [OM] Aerial Photography [OT]
From: "Ian A. Nichols" <I.A.Nichols@xxxxxxxxxxxxx>
Date: Mon, 11 Dec 2000 09:51:27 +0000 (GMT)

On Sat, 9 Dec 2000, Andrew Fildes wrote:

> >When did spitfires get five bladed props?  The model I built (ages ago) only
> >had a three bladed prop.
> >
> >Steve Goss, Dallas Tx usa
> 
> The early models had a three blade prop and wing monted machine guns. The
> later models (and there were over 20 versions) had a five blade prop and
> 20mm canon fitted. This is a 1945 model. I want it - badly.
> Andrew

The reason for this being engine power.  The mark 1 had a 900hp normally
aspirated Merlin, mark 19 (IIRC) had a 2000hp turbocharged Griffon.
There's only 2 ways to turn that amount of power into thrust use a
bigger diameter propeller (ground clearance problems, tips have to go
supersonic) or more blades.  The ultimate extension of this logic, I
suppose would be the Faery Gannet - two contra-rotating propellers
driven by one engine, but that's straying too far OT even for this list.

-- 
________________________________________________________________________
*             |                                                        |
|  /  | |/-\  |                      Ian A. Nichols                    |
| |   | |   | |             http://www.chm.bris.ac.uk/~cpian/          |
|  \-/| |  /  |                  i.a.nichols@xxxxxxxxxx                |
|             *                    iann@xxxxxxxxxxxxx                  |
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