Quote:
Originally Posted by Paul
From the 78th spitfire I onwards - either a constant speed OR two pitch 3 bladed propellor rather than the 2 bladed wooden fixed pitch. These fought in the battle of britain.
Many aircraft were field upgraded during the BoB to the constant speed.
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The Narrow Margin says "... to enquire whether a Spitfire could be fitted with a constant speed propeller ... An extra 7,000 feet was added to the service ceiling and the machine had a better manouverability at height and improved take-off and landing perfomance ... on June 22nd, de Havilland received verbal orders to convert all R.A.F. Merlin powered fighters in the field with top priority. ... By August 15th 1,051 Spitfires and Hurricanes had been converted,"
Hope that helps.