Jonnyu1
Newbie

Posts: 2
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« on: October 29, 2014, 09:03:34 PM » |
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I note that the Mk III had an angled firewall, and I believe re-designed and enlarged fuel tanks with the Merlin XX installation, and with the later Merlin 60 series installation.
I believe that the Merlin Mk VII/VIII - and from those, the Mk XIV and later with the Griffon - were derived from the Mk III, but whilst the Mk XIV also had an angled firewall (same or different I don't know), the Mk VIII, with a Merlin, reverted to a vertical firewall, like the I/II/V/IX/XVI series.
Why? Seems odd!
I can't see any mention of this in the limited information on the Mk III I can find on the web.
I have the Harleyford book on the Spitfire, but not the Morgan and Shacklady book which seems to be definitive.
References to changes to engine, cowlings, intakes, radiators, wing, ailerons, undercarriage, windscreen, tailwheel etc. developments - all can be found in these sources. But not the angled firewall...
Anyone have any ideas or references I can follow up?
Many thanks
John
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